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2004-01-05 d
d
Cosmic 'Dark Flow' Detected Across Billions Of Light Years
http://www.sciencedaily.com/releases/2008/09/080923104410.htm
'Dark Flow'
Mysterious New 'Dark Flow' Discovered in Space - FOXNews.com
Science News | Science & Technology | Technology News
http://www.foxnews.com/story/0,2933,427082,00.html
DSS (Digitized Sky Survey) は、米国パロマー天文台のサミュエル・オシン・シュミット望遠鏡と、
オーストラリアにあるアングロ・オーストラリア天文台の英国シュミット望遠鏡を用いて、全天を撮影し、デジタル化したもの。
平均的には20等級前後の天体まで
DNAを読むしくみの解明 | KEK
http://www.kek.jp/ja/news/highlights/2010/HistoneCIA.html
Dark Energy
D
Dark energy is the cosmological constant, or that 'nothing weighs something'.
Abell 85
HD
normal :HDと あまり差がない気が・・・
For the first time, astronomers have detected evidence that so-called "dark energy" is stifling growth among galaxy clusters across the cosmos.
"The results are remarkably consistent with those from previous results that measure the expansion of the Universe using distance measurements, revealing that general relativity works as expected on large scales. The cluster work, in combination with other studies, also provides the strongest evidence to date that dark energy is the cosmological constant, or that 'nothing weighs something'. "
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
NASA to Announce New Findings on Dark Energy (2008-12-11)
By: NASA , PR Newswire Association LLC
Astronomers will hold a media teleconference Tuesday, Dec. 16 at 1 p.m. EST to announce important new results on dark energy that were made using NASA's Chandra X-ray Observatory.
The briefing participants are:
Alexey Vikhlinin, astrophysicist, Smithsonian Astrophysical Observatory, Cambridge, Mass.
William Forman, astrophysicist, Smithsonian Astrophysical Observatory
David Spergel, theoretical astrophysicist, Princeton University" EPICOS - News:
http://www.epicos.com/
Dark Energy Constantly With Us / Science News
"By combining the new data with that from several other studies, the team finds that dark energy appears to have maintained the same density over time, resembling Einstein’s cosmological constant."
http://www.sciencenews.org/view/generic/id/39341/title/Dark_energy_constantly_with_us
the voids are not enough to explain away dark energy. "
NASA Jet Propulsion Laboratory - News
"Vanderveld and her colleagues at Cornell University, Ithaca, N.Y., looked more closely at this theory and found a few "holes." The group at Fermi had assumed a bunch of voids would line up between us and the supernovae, but Vanderveld's group said, in reality, the voids would be distributed more randomly -- again like Swiss cheese. With this random distribution, the voids are not enough to explain away dark energy.
There is, however, one other freakish possibility that could mean a void is creating the illusion of an accelerating universe. If our solar system just happened to sit in the middle of a void, then that void would distort our observations. Said Vanderveld, "It's really hard to tell if we're in a void, but for the most part this possibility has been ruled out." "
http://www.jpl.nasa.gov/news/features.cfm?feature=1988
Abell 1689 :First Use of Cosmic Lens to Probe Dark Energy
galaxy cluster Abell 1689を用いて
Cosmological Constraints from Strong Gravitational Lensing in Clusters of Galaxies
Figure 1: The critical lines for a source at z = 3 are overplotted in yellow on the HST ACS image of Abell 1689. The lensing mass model used is the one from which we derived cosmological constraints. In addition to 2 large scale clumps and the BCG, this model includes the contribution of 58 cluster galaxies.
The positions of cluster galaxies are marked with green crosses. Overplotted in white are the 28 multiple images arising from 12 families that we used in this work; the red circles mark the positions of the rejected images.
http://www.spacetelescope.org/static/archives/releases/science_papers/heic1014.pdf
As they conclude in their full paper (warning: not for the fainthearted!), it's a technique that will get even better once observations of ultra-distant objects start rolling in from the forthcoming James Webb Space Telescope.
A New Twist on Dark Energy - SkyandTelescope.com
http://www.skyandtelescope.com/community/skyblog/newsblog/101095989.html
Cosmic Lens Used to Probe Dark Energy for First Time - JPL
the Aug. 20 issue of the journal Science.
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272
First Use of Cosmic Lens to Probe Dark Energy (08/19/2010)HubbleSite - NewsCenter - The Full Story
http://hubblesite.org/newscenter/archive/releases/2010/26/full/
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.physorg.com/news201427857.html
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.sciencedaily.com/releases/2010/08/100819141917.htm
Fate of Universe revealed by galactic lens- BBC News
The way in which light is distorted by this cosmic lens depends on three factors: how far away the distant object is; the mass of Abell 1689; and the distribution of dark energy.
The astronomers were able to measure the first two variables using the European Southern Observatory's Very Large Telescope, enabling them to calculate this crucial third factor.
http://www.bbc.co.uk/news/science-environment-11030889
Lambda-CDM model - Wikipedia
ΛCDM or Lambda-CDM is an abbreviation for Lambda-Cold Dark Matter. It is frequently referred to as the standard model
http://en.wikipedia.org/wiki/Lambda-CDM_model
Lambda cold dark matter - Scholarpedia
http://www.scholarpedia.org/article/Lambda_cold_dark_matter
Void that is truly empty solves dark energy puzzle - New Scientist
The trouble is that when physicists use QCD to estimate the condensate's energy density, their calculations suggest it would pack a punch that is 1045 times the cosmological constant that we measure from observations of the universe's expansion.
http://www.newscientist.com/article/mg20727764.100-void-that-is-truly-empty-solves-dark-energy-puzzle.html
Phys. Rev. C 82, 022201 (2010): New perspectives on the quark condensate
http://prc.aps.org/abstract/PRC/v82/i2/e022201
Black holes + dark matter = light
TWO of the darkest things in the universe may be making light - or at least, radiation.
When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuff.
http://www.newscientist.com/article/mg20727753.800-black-holes--dark-matter--light.html
Phys. Rev. D 57, 1299 (1998): Multi-GeV photons from electron–dark-matter scattering near active galactic nuclei
http://prd.aps.org/abstract/PRD/v57/i2/p1299_1
[1008.2230] Probing Dark Matter with AGN Jets
http://arxiv.org/abs/1008.2230
Double meteorite strike 'caused dinosaur extinction' - BBC News
"The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.
Now evidence for a second impact in the Ukraine has been uncovered.
The Boltysh Crater in the Ukraine was first reported in 2002. However, until now it was uncertain exactly how the timing of this event related to the Chicxulub impact.
http://www.bbc.co.uk/news/science-environment-11112417
22億年前の「超温暖化」は地球に何をもたらしたのか？（1） | WIRED
6億年前の「マリノアン氷河時代」
7億年前の「スターチアン氷河時代」
22億年前の「ヒューロニアン氷河時代」の全球凍結後には、酸素濃度が急激に上昇し、真核生物が誕生する契機になったとも言われている。
1999年、氷河堆積物を覆う炭酸塩岩中の炭素同位体を測定することで、約7億〜6億年前の氷河時代の直後に「生物による光合成活動が完全に停止した」ことを明らかに。
http://wiredvision.jp/blog/yamaji/201008/201008271401.html
Dark Energy
Dark Energy Found Stifling Growth in Universe -NASA
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
"Abell 85: Dark Energy Found Stifling Growth in Universe "
http://chandra.harvard.edu/photo/2008/darkenergy/
In this paper, we present cosmological parameter constraints obtained from Chandra observations of 36 clusters with <z>=0.55 derived from 400deg^2 ROSAT serendipitous survey and 49 brightest z=~0.05 clusters detected in the All-Sky Survey. Evolution of the mass function between these redshifts requires Omega_Lambda>0 with a ~5sigma significance, and constrains the dark energy equation of state parameter to w0=-1.14+-0.21, assuming constant w and flat universe.
[0812.2720] Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
"(Submitted on 15 Dec 2008)"
http://arxiv.org/abs/0812.2720
Lighting up dark energy
"This work will be published in the February 10th edition of The Astrophysical Journal. A preprint is available through the arXiv archive. "
http://arstechnica.com/journals/science.ars/2008/12/17/lighting-up-dark-energy
Beyond the Shadow of a Doubt? Dark Energy Independently Confirmed:
In 1998 two teams of researchers made a milestone cosmological announcement: The universe, long known to be expanding, was not slowing down in its expansion as expected but was in fact accelerating. Both groups had been studying exploding stars, or supernovae, and used the objects' movement to show that the universe is speeding up. The culprit was labeled dark energy―a hypothesized presence that pervades space and pushes the pieces of the universe apart.
A new study that examines the growth of galaxy clusters rather than the movement of stars independently confirms the presence of dark energy
Scientific American
http://www.sciam.com/article.cfm?id=dark-energy-confirmed
Dark Matter Cosmology
Discovering Dark Matter Cosmology | Jerome Drexler
http://www.jeromedrexler.org/
DTN delay/disruption-tolerant networking：ITpro
"DTNでは，物理的なリンクが常に存在しているとは限らないという前提で，トランスポート層の上に「バンドル」と呼ぶプロトコルを乗せたオーバーレイ・ネットワーク構成をとる。
DTNの提案者はTCP/IPの開発者として知られるビントン・サーフ氏
DTNは，2008年11月にNASAが彗星探査機「EPOXI」による通信実験に成功したことで注目を集めた。次は国際宇宙ステーション（ISS）を使った実験が2009年夏に予定されている。"
http://itpro.nikkeibp.co.jp/article/Keyword/20090203/324080/?ST=network
d
Cosmic 'Dark Flow' Detected Across Billions Of Light Years
http://www.sciencedaily.com/releases/2008/09/080923104410.htm
'Dark Flow'
Mysterious New 'Dark Flow' Discovered in Space - FOXNews.com
Science News | Science & Technology | Technology News
http://www.foxnews.com/story/0,2933,427082,00.html
DSS (Digitized Sky Survey) は、米国パロマー天文台のサミュエル・オシン・シュミット望遠鏡と、
オーストラリアにあるアングロ・オーストラリア天文台の英国シュミット望遠鏡を用いて、全天を撮影し、デジタル化したもの。
平均的には20等級前後の天体まで
DNAを読むしくみの解明 | KEK
http://www.kek.jp/ja/news/highlights/2010/HistoneCIA.html
Dark Energy
D
Dark energy is the cosmological constant, or that 'nothing weighs something'.
Abell 85
HD
normal :HDと あまり差がない気が・・・
For the first time, astronomers have detected evidence that so-called "dark energy" is stifling growth among galaxy clusters across the cosmos.
"The results are remarkably consistent with those from previous results that measure the expansion of the Universe using distance measurements, revealing that general relativity works as expected on large scales. The cluster work, in combination with other studies, also provides the strongest evidence to date that dark energy is the cosmological constant, or that 'nothing weighs something'. "
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
NASA to Announce New Findings on Dark Energy (2008-12-11)
By: NASA , PR Newswire Association LLC
Astronomers will hold a media teleconference Tuesday, Dec. 16 at 1 p.m. EST to announce important new results on dark energy that were made using NASA's Chandra X-ray Observatory.
The briefing participants are:
Alexey Vikhlinin, astrophysicist, Smithsonian Astrophysical Observatory, Cambridge, Mass.
William Forman, astrophysicist, Smithsonian Astrophysical Observatory
David Spergel, theoretical astrophysicist, Princeton University" EPICOS - News:
http://www.epicos.com/
Dark Energy Constantly With Us / Science News
"By combining the new data with that from several other studies, the team finds that dark energy appears to have maintained the same density over time, resembling Einstein’s cosmological constant."
http://www.sciencenews.org/view/generic/id/39341/title/Dark_energy_constantly_with_us
the voids are not enough to explain away dark energy. "
NASA Jet Propulsion Laboratory - News
"Vanderveld and her colleagues at Cornell University, Ithaca, N.Y., looked more closely at this theory and found a few "holes." The group at Fermi had assumed a bunch of voids would line up between us and the supernovae, but Vanderveld's group said, in reality, the voids would be distributed more randomly -- again like Swiss cheese. With this random distribution, the voids are not enough to explain away dark energy.
There is, however, one other freakish possibility that could mean a void is creating the illusion of an accelerating universe. If our solar system just happened to sit in the middle of a void, then that void would distort our observations. Said Vanderveld, "It's really hard to tell if we're in a void, but for the most part this possibility has been ruled out." "
http://www.jpl.nasa.gov/news/features.cfm?feature=1988
Abell 1689 :First Use of Cosmic Lens to Probe Dark Energy
galaxy cluster Abell 1689を用いて
Cosmological Constraints from Strong Gravitational Lensing in Clusters of Galaxies
Figure 1: The critical lines for a source at z = 3 are overplotted in yellow on the HST ACS image of Abell 1689. The lensing mass model used is the one from which we derived cosmological constraints. In addition to 2 large scale clumps and the BCG, this model includes the contribution of 58 cluster galaxies.
The positions of cluster galaxies are marked with green crosses. Overplotted in white are the 28 multiple images arising from 12 families that we used in this work; the red circles mark the positions of the rejected images.
http://www.spacetelescope.org/static/archives/releases/science_papers/heic1014.pdf
As they conclude in their full paper (warning: not for the fainthearted!), it's a technique that will get even better once observations of ultra-distant objects start rolling in from the forthcoming James Webb Space Telescope.
A New Twist on Dark Energy - SkyandTelescope.com
http://www.skyandtelescope.com/community/skyblog/newsblog/101095989.html
Cosmic Lens Used to Probe Dark Energy for First Time - JPL
the Aug. 20 issue of the journal Science.
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272
First Use of Cosmic Lens to Probe Dark Energy (08/19/2010)HubbleSite - NewsCenter - The Full Story
http://hubblesite.org/newscenter/archive/releases/2010/26/full/
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.physorg.com/news201427857.html
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.sciencedaily.com/releases/2010/08/100819141917.htm
Fate of Universe revealed by galactic lens- BBC News
The way in which light is distorted by this cosmic lens depends on three factors: how far away the distant object is; the mass of Abell 1689; and the distribution of dark energy.
The astronomers were able to measure the first two variables using the European Southern Observatory's Very Large Telescope, enabling them to calculate this crucial third factor.
http://www.bbc.co.uk/news/science-environment-11030889
Lambda-CDM model - Wikipedia
ΛCDM or Lambda-CDM is an abbreviation for Lambda-Cold Dark Matter. It is frequently referred to as the standard model
http://en.wikipedia.org/wiki/Lambda-CDM_model
Lambda cold dark matter - Scholarpedia
http://www.scholarpedia.org/article/Lambda_cold_dark_matter
Void that is truly empty solves dark energy puzzle - New Scientist
The trouble is that when physicists use QCD to estimate the condensate's energy density, their calculations suggest it would pack a punch that is 1045 times the cosmological constant that we measure from observations of the universe's expansion.
http://www.newscientist.com/article/mg20727764.100-void-that-is-truly-empty-solves-dark-energy-puzzle.html
Phys. Rev. C 82, 022201 (2010): New perspectives on the quark condensate
http://prc.aps.org/abstract/PRC/v82/i2/e022201
Black holes + dark matter = light
TWO of the darkest things in the universe may be making light - or at least, radiation.
When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuff.
http://www.newscientist.com/article/mg20727753.800-black-holes--dark-matter--light.html
Phys. Rev. D 57, 1299 (1998): Multi-GeV photons from electron–dark-matter scattering near active galactic nuclei
http://prd.aps.org/abstract/PRD/v57/i2/p1299_1
[1008.2230] Probing Dark Matter with AGN Jets
http://arxiv.org/abs/1008.2230
Double meteorite strike 'caused dinosaur extinction' - BBC News
"The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.
Now evidence for a second impact in the Ukraine has been uncovered.
The Boltysh Crater in the Ukraine was first reported in 2002. However, until now it was uncertain exactly how the timing of this event related to the Chicxulub impact.
http://www.bbc.co.uk/news/science-environment-11112417
22億年前の「超温暖化」は地球に何をもたらしたのか？（1） | WIRED
6億年前の「マリノアン氷河時代」
7億年前の「スターチアン氷河時代」
22億年前の「ヒューロニアン氷河時代」の全球凍結後には、酸素濃度が急激に上昇し、真核生物が誕生する契機になったとも言われている。
1999年、氷河堆積物を覆う炭酸塩岩中の炭素同位体を測定することで、約7億〜6億年前の氷河時代の直後に「生物による光合成活動が完全に停止した」ことを明らかに。
http://wiredvision.jp/blog/yamaji/201008/201008271401.html
Dark Energy
Dark Energy Found Stifling Growth in Universe -NASA
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
"Abell 85: Dark Energy Found Stifling Growth in Universe "
http://chandra.harvard.edu/photo/2008/darkenergy/
In this paper, we present cosmological parameter constraints obtained from Chandra observations of 36 clusters with <z>=0.55 derived from 400deg^2 ROSAT serendipitous survey and 49 brightest z=~0.05 clusters detected in the All-Sky Survey. Evolution of the mass function between these redshifts requires Omega_Lambda>0 with a ~5sigma significance, and constrains the dark energy equation of state parameter to w0=-1.14+-0.21, assuming constant w and flat universe.
[0812.2720] Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
"(Submitted on 15 Dec 2008)"
http://arxiv.org/abs/0812.2720
Lighting up dark energy
"This work will be published in the February 10th edition of The Astrophysical Journal. A preprint is available through the arXiv archive. "
http://arstechnica.com/journals/science.ars/2008/12/17/lighting-up-dark-energy
Beyond the Shadow of a Doubt? Dark Energy Independently Confirmed:
In 1998 two teams of researchers made a milestone cosmological announcement: The universe, long known to be expanding, was not slowing down in its expansion as expected but was in fact accelerating. Both groups had been studying exploding stars, or supernovae, and used the objects' movement to show that the universe is speeding up. The culprit was labeled dark energy―a hypothesized presence that pervades space and pushes the pieces of the universe apart.
A new study that examines the growth of galaxy clusters rather than the movement of stars independently confirms the presence of dark energy
Scientific American
http://www.sciam.com/article.cfm?id=dark-energy-confirmed
Dark Matter Cosmology
Discovering Dark Matter Cosmology | Jerome Drexler
http://www.jeromedrexler.org/
DTN delay/disruption-tolerant networking：ITpro
"DTNでは，物理的なリンクが常に存在しているとは限らないという前提で，トランスポート層の上に「バンドル」と呼ぶプロトコルを乗せたオーバーレイ・ネットワーク構成をとる。
DTNの提案者はTCP/IPの開発者として知られるビントン・サーフ氏
DTNは，2008年11月にNASAが彗星探査機「EPOXI」による通信実験に成功したことで注目を集めた。次は国際宇宙ステーション（ISS）を使った実験が2009年夏に予定されている。"
http://itpro.nikkeibp.co.jp/article/Keyword/20090203/324080/?ST=network
d
Cosmic 'Dark Flow' Detected Across Billions Of Light Years
http://www.sciencedaily.com/releases/2008/09/080923104410.htm
'Dark Flow'
Mysterious New 'Dark Flow' Discovered in Space - FOXNews.com
Science News | Science & Technology | Technology News
http://www.foxnews.com/story/0,2933,427082,00.html
DSS (Digitized Sky Survey) は、米国パロマー天文台のサミュエル・オシン・シュミット望遠鏡と、
オーストラリアにあるアングロ・オーストラリア天文台の英国シュミット望遠鏡を用いて、全天を撮影し、デジタル化したもの。
平均的には20等級前後の天体まで
DNAを読むしくみの解明 | KEK
http://www.kek.jp/ja/news/highlights/2010/HistoneCIA.html
Dark Energy
D
Dark energy is the cosmological constant, or that 'nothing weighs something'.
Abell 85
HD
normal :HDと あまり差がない気が・・・
For the first time, astronomers have detected evidence that so-called "dark energy" is stifling growth among galaxy clusters across the cosmos.
"The results are remarkably consistent with those from previous results that measure the expansion of the Universe using distance measurements, revealing that general relativity works as expected on large scales. The cluster work, in combination with other studies, also provides the strongest evidence to date that dark energy is the cosmological constant, or that 'nothing weighs something'. "
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
NASA to Announce New Findings on Dark Energy (2008-12-11)
By: NASA , PR Newswire Association LLC
Astronomers will hold a media teleconference Tuesday, Dec. 16 at 1 p.m. EST to announce important new results on dark energy that were made using NASA's Chandra X-ray Observatory.
The briefing participants are:
Alexey Vikhlinin, astrophysicist, Smithsonian Astrophysical Observatory, Cambridge, Mass.
William Forman, astrophysicist, Smithsonian Astrophysical Observatory
David Spergel, theoretical astrophysicist, Princeton University" EPICOS - News:
http://www.epicos.com/
Dark Energy Constantly With Us / Science News
"By combining the new data with that from several other studies, the team finds that dark energy appears to have maintained the same density over time, resembling Einstein’s cosmological constant."
http://www.sciencenews.org/view/generic/id/39341/title/Dark_energy_constantly_with_us
the voids are not enough to explain away dark energy. "
NASA Jet Propulsion Laboratory - News
"Vanderveld and her colleagues at Cornell University, Ithaca, N.Y., looked more closely at this theory and found a few "holes." The group at Fermi had assumed a bunch of voids would line up between us and the supernovae, but Vanderveld's group said, in reality, the voids would be distributed more randomly -- again like Swiss cheese. With this random distribution, the voids are not enough to explain away dark energy.
There is, however, one other freakish possibility that could mean a void is creating the illusion of an accelerating universe. If our solar system just happened to sit in the middle of a void, then that void would distort our observations. Said Vanderveld, "It's really hard to tell if we're in a void, but for the most part this possibility has been ruled out." "
http://www.jpl.nasa.gov/news/features.cfm?feature=1988
Abell 1689 :First Use of Cosmic Lens to Probe Dark Energy
galaxy cluster Abell 1689を用いて
Cosmological Constraints from Strong Gravitational Lensing in Clusters of Galaxies
Figure 1: The critical lines for a source at z = 3 are overplotted in yellow on the HST ACS image of Abell 1689. The lensing mass model used is the one from which we derived cosmological constraints. In addition to 2 large scale clumps and the BCG, this model includes the contribution of 58 cluster galaxies.
The positions of cluster galaxies are marked with green crosses. Overplotted in white are the 28 multiple images arising from 12 families that we used in this work; the red circles mark the positions of the rejected images.
http://www.spacetelescope.org/static/archives/releases/science_papers/heic1014.pdf
As they conclude in their full paper (warning: not for the fainthearted!), it's a technique that will get even better once observations of ultra-distant objects start rolling in from the forthcoming James Webb Space Telescope.
A New Twist on Dark Energy - SkyandTelescope.com
http://www.skyandtelescope.com/community/skyblog/newsblog/101095989.html
Cosmic Lens Used to Probe Dark Energy for First Time - JPL
the Aug. 20 issue of the journal Science.
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272
First Use of Cosmic Lens to Probe Dark Energy (08/19/2010)HubbleSite - NewsCenter - The Full Story
http://hubblesite.org/newscenter/archive/releases/2010/26/full/
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.physorg.com/news201427857.html
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.sciencedaily.com/releases/2010/08/100819141917.htm
Fate of Universe revealed by galactic lens- BBC News
The way in which light is distorted by this cosmic lens depends on three factors: how far away the distant object is; the mass of Abell 1689; and the distribution of dark energy.
The astronomers were able to measure the first two variables using the European Southern Observatory's Very Large Telescope, enabling them to calculate this crucial third factor.
http://www.bbc.co.uk/news/science-environment-11030889
Lambda-CDM model - Wikipedia
ΛCDM or Lambda-CDM is an abbreviation for Lambda-Cold Dark Matter. It is frequently referred to as the standard model
http://en.wikipedia.org/wiki/Lambda-CDM_model
Lambda cold dark matter - Scholarpedia
http://www.scholarpedia.org/article/Lambda_cold_dark_matter
Void that is truly empty solves dark energy puzzle - New Scientist
The trouble is that when physicists use QCD to estimate the condensate's energy density, their calculations suggest it would pack a punch that is 1045 times the cosmological constant that we measure from observations of the universe's expansion.
http://www.newscientist.com/article/mg20727764.100-void-that-is-truly-empty-solves-dark-energy-puzzle.html
Phys. Rev. C 82, 022201 (2010): New perspectives on the quark condensate
http://prc.aps.org/abstract/PRC/v82/i2/e022201
Black holes + dark matter = light
TWO of the darkest things in the universe may be making light - or at least, radiation.
When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuff.
http://www.newscientist.com/article/mg20727753.800-black-holes--dark-matter--light.html
Phys. Rev. D 57, 1299 (1998): Multi-GeV photons from electron–dark-matter scattering near active galactic nuclei
http://prd.aps.org/abstract/PRD/v57/i2/p1299_1
[1008.2230] Probing Dark Matter with AGN Jets
http://arxiv.org/abs/1008.2230
Double meteorite strike 'caused dinosaur extinction' - BBC News
"The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.
Now evidence for a second impact in the Ukraine has been uncovered.
The Boltysh Crater in the Ukraine was first reported in 2002. However, until now it was uncertain exactly how the timing of this event related to the Chicxulub impact.
http://www.bbc.co.uk/news/science-environment-11112417
22億年前の「超温暖化」は地球に何をもたらしたのか？（1） | WIRED
6億年前の「マリノアン氷河時代」
7億年前の「スターチアン氷河時代」
22億年前の「ヒューロニアン氷河時代」の全球凍結後には、酸素濃度が急激に上昇し、真核生物が誕生する契機になったとも言われている。
1999年、氷河堆積物を覆う炭酸塩岩中の炭素同位体を測定することで、約7億〜6億年前の氷河時代の直後に「生物による光合成活動が完全に停止した」ことを明らかに。
http://wiredvision.jp/blog/yamaji/201008/201008271401.html
Dark Energy
Dark Energy Found Stifling Growth in Universe -NASA
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
"Abell 85: Dark Energy Found Stifling Growth in Universe "
http://chandra.harvard.edu/photo/2008/darkenergy/
In this paper, we present cosmological parameter constraints obtained from Chandra observations of 36 clusters with <z>=0.55 derived from 400deg^2 ROSAT serendipitous survey and 49 brightest z=~0.05 clusters detected in the All-Sky Survey. Evolution of the mass function between these redshifts requires Omega_Lambda>0 with a ~5sigma significance, and constrains the dark energy equation of state parameter to w0=-1.14+-0.21, assuming constant w and flat universe.
[0812.2720] Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
"(Submitted on 15 Dec 2008)"
http://arxiv.org/abs/0812.2720
Lighting up dark energy
"This work will be published in the February 10th edition of The Astrophysical Journal. A preprint is available through the arXiv archive. "
http://arstechnica.com/journals/science.ars/2008/12/17/lighting-up-dark-energy
Beyond the Shadow of a Doubt? Dark Energy Independently Confirmed:
In 1998 two teams of researchers made a milestone cosmological announcement: The universe, long known to be expanding, was not slowing down in its expansion as expected but was in fact accelerating. Both groups had been studying exploding stars, or supernovae, and used the objects' movement to show that the universe is speeding up. The culprit was labeled dark energy―a hypothesized presence that pervades space and pushes the pieces of the universe apart.
A new study that examines the growth of galaxy clusters rather than the movement of stars independently confirms the presence of dark energy
Scientific American
http://www.sciam.com/article.cfm?id=dark-energy-confirmed
Dark Matter Cosmology
Discovering Dark Matter Cosmology | Jerome Drexler
http://www.jeromedrexler.org/
DTN delay/disruption-tolerant networking：ITpro
"DTNでは，物理的なリンクが常に存在しているとは限らないという前提で，トランスポート層の上に「バンドル」と呼ぶプロトコルを乗せたオーバーレイ・ネットワーク構成をとる。
DTNの提案者はTCP/IPの開発者として知られるビントン・サーフ氏
DTNは，2008年11月にNASAが彗星探査機「EPOXI」による通信実験に成功したことで注目を集めた。次は国際宇宙ステーション（ISS）を使った実験が2009年夏に予定されている。"
http://itpro.nikkeibp.co.jp/article/Keyword/20090203/324080/?ST=network
d
Dark Energy
Hubble Rules Out One Alternative to Dark Energy
http://www.nasa.gov/mission_pages/hubble/science/cosmic-expansion.html
Hubble rules out one alternative to dark energy
(PhysOrg.com) -- Astronomers using NASA's Hubble Space Telescope have ruled out an alternate theory on the nature of dark energy after recalculating the expansion rate of the universe to unprecedented accuracy.
http://www.physorg.com/news/2011-03-hubble-alternative-dark-energy.html
Cosmic 'Dark Flow' Detected Across Billions Of Light Years
http://www.sciencedaily.com/releases/2008/09/080923104410.htm
'Dark Flow'
Mysterious New 'Dark Flow' Discovered in Space - FOXNews.com
Science News | Science & Technology | Technology News
http://www.foxnews.com/story/0,2933,427082,00.html
DSS (Digitized Sky Survey) は、米国パロマー天文台のサミュエル・オシン・シュミット望遠鏡と、
オーストラリアにあるアングロ・オーストラリア天文台の英国シュミット望遠鏡を用いて、全天を撮影し、デジタル化したもの。
平均的には20等級前後の天体まで
DNAを読むしくみの解明 | KEK
http://www.kek.jp/ja/news/highlights/2010/HistoneCIA.html
Dark Energy
D
Dark energy is the cosmological constant, or that 'nothing weighs something'.
Abell 85
HD
normal :HDと あまり差がない気が・・・
For the first time, astronomers have detected evidence that so-called "dark energy" is stifling growth among galaxy clusters across the cosmos.
"The results are remarkably consistent with those from previous results that measure the expansion of the Universe using distance measurements, revealing that general relativity works as expected on large scales. The cluster work, in combination with other studies, also provides the strongest evidence to date that dark energy is the cosmological constant, or that 'nothing weighs something'. "
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
NASA to Announce New Findings on Dark Energy (2008-12-11)
By: NASA , PR Newswire Association LLC
Astronomers will hold a media teleconference Tuesday, Dec. 16 at 1 p.m. EST to announce important new results on dark energy that were made using NASA's Chandra X-ray Observatory.
The briefing participants are:
Alexey Vikhlinin, astrophysicist, Smithsonian Astrophysical Observatory, Cambridge, Mass.
William Forman, astrophysicist, Smithsonian Astrophysical Observatory
David Spergel, theoretical astrophysicist, Princeton University" EPICOS - News:
http://www.epicos.com/
Dark Energy Constantly With Us / Science News
"By combining the new data with that from several other studies, the team finds that dark energy appears to have maintained the same density over time, resembling Einstein’s cosmological constant."
http://www.sciencenews.org/view/generic/id/39341/title/Dark_energy_constantly_with_us
the voids are not enough to explain away dark energy. "
NASA Jet Propulsion Laboratory - News
"Vanderveld and her colleagues at Cornell University, Ithaca, N.Y., looked more closely at this theory and found a few "holes." The group at Fermi had assumed a bunch of voids would line up between us and the supernovae, but Vanderveld's group said, in reality, the voids would be distributed more randomly -- again like Swiss cheese. With this random distribution, the voids are not enough to explain away dark energy.
There is, however, one other freakish possibility that could mean a void is creating the illusion of an accelerating universe. If our solar system just happened to sit in the middle of a void, then that void would distort our observations. Said Vanderveld, "It's really hard to tell if we're in a void, but for the most part this possibility has been ruled out." "
http://www.jpl.nasa.gov/news/features.cfm?feature=1988
Abell 1689 :First Use of Cosmic Lens to Probe Dark Energy
galaxy cluster Abell 1689を用いて
Cosmological Constraints from Strong Gravitational Lensing in Clusters of Galaxies
Figure 1: The critical lines for a source at z = 3 are overplotted in yellow on the HST ACS image of Abell 1689. The lensing mass model used is the one from which we derived cosmological constraints. In addition to 2 large scale clumps and the BCG, this model includes the contribution of 58 cluster galaxies.
The positions of cluster galaxies are marked with green crosses. Overplotted in white are the 28 multiple images arising from 12 families that we used in this work; the red circles mark the positions of the rejected images.
http://www.spacetelescope.org/static/archives/releases/science_papers/heic1014.pdf
As they conclude in their full paper (warning: not for the fainthearted!), it's a technique that will get even better once observations of ultra-distant objects start rolling in from the forthcoming James Webb Space Telescope.
A New Twist on Dark Energy - SkyandTelescope.com
http://www.skyandtelescope.com/community/skyblog/newsblog/101095989.html
Cosmic Lens Used to Probe Dark Energy for First Time - JPL
the Aug. 20 issue of the journal Science.
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272
First Use of Cosmic Lens to Probe Dark Energy (08/19/2010)HubbleSite - NewsCenter - The Full Story
http://hubblesite.org/newscenter/archive/releases/2010/26/full/
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.physorg.com/news201427857.html
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.sciencedaily.com/releases/2010/08/100819141917.htm
Fate of Universe revealed by galactic lens- BBC News
The way in which light is distorted by this cosmic lens depends on three factors: how far away the distant object is; the mass of Abell 1689; and the distribution of dark energy.
The astronomers were able to measure the first two variables using the European Southern Observatory's Very Large Telescope, enabling them to calculate this crucial third factor.
http://www.bbc.co.uk/news/science-environment-11030889
Lambda-CDM model - Wikipedia
ΛCDM or Lambda-CDM is an abbreviation for Lambda-Cold Dark Matter. It is frequently referred to as the standard model
http://en.wikipedia.org/wiki/Lambda-CDM_model
Lambda cold dark matter - Scholarpedia
http://www.scholarpedia.org/article/Lambda_cold_dark_matter
Void that is truly empty solves dark energy puzzle - New Scientist
The trouble is that when physicists use QCD to estimate the condensate's energy density, their calculations suggest it would pack a punch that is 1045 times the cosmological constant that we measure from observations of the universe's expansion.
http://www.newscientist.com/article/mg20727764.100-void-that-is-truly-empty-solves-dark-energy-puzzle.html
Phys. Rev. C 82, 022201 (2010): New perspectives on the quark condensate
http://prc.aps.org/abstract/PRC/v82/i2/e022201
Black holes + dark matter = light
TWO of the darkest things in the universe may be making light - or at least, radiation.
When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuff.
http://www.newscientist.com/article/mg20727753.800-black-holes--dark-matter--light.html
Phys. Rev. D 57, 1299 (1998): Multi-GeV photons from electron–dark-matter scattering near active galactic nuclei
http://prd.aps.org/abstract/PRD/v57/i2/p1299_1
[1008.2230] Probing Dark Matter with AGN Jets
http://arxiv.org/abs/1008.2230
Double meteorite strike 'caused dinosaur extinction' - BBC News
"The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.
Now evidence for a second impact in the Ukraine has been uncovered.
The Boltysh Crater in the Ukraine was first reported in 2002. However, until now it was uncertain exactly how the timing of this event related to the Chicxulub impact.
http://www.bbc.co.uk/news/science-environment-11112417
22億年前の「超温暖化」は地球に何をもたらしたのか？（1） | WIRED
6億年前の「マリノアン氷河時代」
7億年前の「スターチアン氷河時代」
22億年前の「ヒューロニアン氷河時代」の全球凍結後には、酸素濃度が急激に上昇し、真核生物が誕生する契機になったとも言われている。
1999年、氷河堆積物を覆う炭酸塩岩中の炭素同位体を測定することで、約7億〜6億年前の氷河時代の直後に「生物による光合成活動が完全に停止した」ことを明らかに。
http://wiredvision.jp/blog/yamaji/201008/201008271401.html
Dark Energy
Dark Energy Found Stifling Growth in Universe -NASA
http://www.nasa.gov/mission_pages/chandra/multimedia/photosH08-329.html
"Abell 85: Dark Energy Found Stifling Growth in Universe "
http://chandra.harvard.edu/photo/2008/darkenergy/
In this paper, we present cosmological parameter constraints obtained from Chandra observations of 36 clusters with <z>=0.55 derived from 400deg^2 ROSAT serendipitous survey and 49 brightest z=~0.05 clusters detected in the All-Sky Survey. Evolution of the mass function between these redshifts requires Omega_Lambda>0 with a ~5sigma significance, and constrains the dark energy equation of state parameter to w0=-1.14+-0.21, assuming constant w and flat universe.
[0812.2720] Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
"(Submitted on 15 Dec 2008)"
http://arxiv.org/abs/0812.2720
Lighting up dark energy
"This work will be published in the February 10th edition of The Astrophysical Journal. A preprint is available through the arXiv archive. "
http://arstechnica.com/journals/science.ars/2008/12/17/lighting-up-dark-energy
Beyond the Shadow of a Doubt? Dark Energy Independently Confirmed:
In 1998 two teams of researchers made a milestone cosmological announcement: The universe, long known to be expanding, was not slowing down in its expansion as expected but was in fact accelerating. Both groups had been studying exploding stars, or supernovae, and used the objects' movement to show that the universe is speeding up. The culprit was labeled dark energy―a hypothesized presence that pervades space and pushes the pieces of the universe apart.
A new study that examines the growth of galaxy clusters rather than the movement of stars independently confirms the presence of dark energy
Scientific American
http://www.sciam.com/article.cfm?id=dark-energy-confirmed
Dark Matter Cosmology
Discovering Dark Matter Cosmology | Jerome Drexler
http://www.jeromedrexler.org/
DTN delay/disruption-tolerant networking：ITpro
"DTNでは，物理的なリンクが常に存在しているとは限らないという前提で，トランスポート層の上に「バンドル」と呼ぶプロトコルを乗せたオーバーレイ・ネットワーク構成をとる。
DTNの提案者はTCP/IPの開発者として知られるビントン・サーフ氏
DTNは，2008年11月にNASAが彗星探査機「EPOXI」による通信実験に成功したことで注目を集めた。次は国際宇宙ステーション（ISS）を使った実験が2009年夏に予定されている。"
http://itpro.nikkeibp.co.jp/article/Keyword/20090203/324080/?ST=network
d
DNAを読むしくみの解明 | KEK
http://www.kek.jp/ja/news/highlights/2010/HistoneCIA.html
Dark Energy
Abell 1689 :First Use of Cosmic Lens to Probe Dark Energy
galaxy cluster Abell 1689を用いて
Cosmological Constraints from Strong Gravitational Lensing in Clusters of Galaxies
Figure 1: The critical lines for a source at z = 3 are overplotted in yellow on the HST ACS image of Abell 1689. The lensing mass model used is the one from which we derived cosmological constraints. In addition to 2 large scale clumps and the BCG, this model includes the contribution of 58 cluster galaxies.
The positions of cluster galaxies are marked with green crosses. Overplotted in white are the 28 multiple images arising from 12 families that we used in this work; the red circles mark the positions of the rejected images.
http://www.spacetelescope.org/static/archives/releases/science_papers/heic1014.pdf
As they conclude in their full paper (warning: not for the fainthearted!), it's a technique that will get even better once observations of ultra-distant objects start rolling in from the forthcoming James Webb Space Telescope.
A New Twist on Dark Energy - SkyandTelescope.com
http://www.skyandtelescope.com/community/skyblog/newsblog/101095989.html
Cosmic Lens Used to Probe Dark Energy for First Time - JPL
the Aug. 20 issue of the journal Science.
http://www.jpl.nasa.gov/news/news.cfm?release=2010-272
First Use of Cosmic Lens to Probe Dark Energy (08/19/2010)HubbleSite - NewsCenter - The Full Story
http://hubblesite.org/newscenter/archive/releases/2010/26/full/
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.physorg.com/news201427857.html
Astronomers use galactic magnifying lens to probe elusive dark energy
http://www.sciencedaily.com/releases/2010/08/100819141917.htm
Fate of Universe revealed by galactic lens- BBC News
The way in which light is distorted by this cosmic lens depends on three factors: how far away the distant object is; the mass of Abell 1689; and the distribution of dark energy.
The astronomers were able to measure the first two variables using the European Southern Observatory's Very Large Telescope, enabling them to calculate this crucial third factor.
http://www.bbc.co.uk/news/science-environment-11030889
Lambda-CDM model - Wikipedia
ΛCDM or Lambda-CDM is an abbreviation for Lambda-Cold Dark Matter. It is frequently referred to as the standard model
http://en.wikipedia.org/wiki/Lambda-CDM_model
Lambda cold dark matter - Scholarpedia
http://www.scholarpedia.org/article/Lambda_cold_dark_matter
Void that is truly empty solves dark energy puzzle - New Scientist
The trouble is that when physicists use QCD to estimate the condensate's energy density, their calculations suggest it would pack a punch that is 1045 times the cosmological constant that we measure from observations of the universe's expansion.
http://www.newscientist.com/article/mg20727764.100-void-that-is-truly-empty-solves-dark-energy-puzzle.html
Phys. Rev. C 82, 022201 (2010): New perspectives on the quark condensate
http://prc.aps.org/abstract/PRC/v82/i2/e022201
Black holes + dark matter = light
TWO of the darkest things in the universe may be making light - or at least, radiation.
When jets spat out by a supermassive black hole at the centre of a galaxy collide with dark matter, they could produce gamma rays detectable from Earth - possible evidence of the elusive dark stuff.
http://www.newscientist.com/article/mg20727753.800-black-holes--dark-matter--light.html
Phys. Rev. D 57, 1299 (1998): Multi-GeV photons from electron–dark-matter scattering near active galactic nuclei
http://prd.aps.org/abstract/PRD/v57/i2/p1299_1
[1008.2230] Probing Dark Matter with AGN Jets
http://arxiv.org/abs/1008.2230
Double meteorite strike 'caused dinosaur extinction' - BBC News
"The dinosaurs were wiped out 65 million years ago by at least two meteorite impacts, rather than a single strike, a new study suggests.
Now evidence for a second impact in the Ukraine has been uncovered.
The Boltysh Crater in the Ukraine was first reported in 2002. However, until now it was uncertain exactly how the timing of this event related to the Chicxulub impact.
http://www.bbc.co.uk/news/science-environment-11112417
22億年前の「超温暖化」は地球に何をもたらしたのか？（1） | WIRED
6億年前の「マリノアン氷河時代」
7億年前の「スターチアン氷河時代」
22億年前の「ヒューロニアン氷河時代」の全球凍結後には、酸素濃度が急激に上昇し、真核生物が誕生する契機になったとも言われている。
1999年、氷河堆積物を覆う炭酸塩岩中の炭素同位体を測定することで、約7億〜6億年前の氷河時代の直後に「生物による光合成活動が完全に停止した」ことを明らかに。
http://wiredvision.jp/blog/yamaji/201008/201008271401.html