Dotini
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- CR80_Shifty
http://arxiv.org/abs/1012.2272
"Excess Clustering on Large Scales in the MegaZ DR7 Photometric Redshift Survey
We observe a large excess of power in the statistical clustering of Luminous Red Galaxies in the photometric SDSS galaxy sample called MegaZ DR7. This is seen over the lowest multipoles in the angular power spectra C_{\ell} in four equally spaced redshift bins between 0.45 < z < 0.65. However, it is most prominent in the highest redshift band at ~ 4 sigma and it emerges at an effective scale k ~ 0.01 h Mpc^{-1}. Given that MegaZ DR7 is the largest cosmic volume galaxy survey to date (3.3 (Gpc h^{-1})^3) this implies an anomaly on the largest physical scales probed by galaxies. Alternatively, this signature could be a consequence of it appearing at the most systematically susceptible redshift. There are several explanations for this excess power that range from systematics to new physics. This could have important consequences for the next generation of galaxy surveys or the LCDM model. We test the survey, data and excess power, as well as possible origins. "
http://www.wired.com/wiredscience/2011/06/clumpy-universe/
The universe appears to be clumpier than astronomers expected, according to the largest galaxy survey to date. The extra clumps could call for a redesign of the standard model of cosmology, and maybe a new understanding of how gravity works.
Maybe on very large scales, Einsteins general relativity is slightly wrong, said cosmologist Shaun Thomas of University College London, lead author of a new paper in Physical Review Letters. This potentially could be one of the first signs that something peculiar is going on.
The universe appears to be clumpier than astronomers expected, according to the largest galaxy survey to date. The extra clumps could call for a redesign of the standard model of cosmology, and maybe a new understanding of how gravity works.
The result could mean cosmologists need to reassess their understanding of dark energy, the mysterious force that drives the universe outward at an ever-increasing rate. Dark energy itself is supposed to be almost perfectly smooth, but clumps of dark energy could draw clumps of visible matter around them.
The extra lumps could also mean dark energy doesnt exist at all. Instead, gravity could behave differently on very large scales than it does on smaller scales, meaning Einsteins theory of general relativity needs an overhaul.
Respectfully submitted for GTP member comments,
Dotini
"Excess Clustering on Large Scales in the MegaZ DR7 Photometric Redshift Survey
We observe a large excess of power in the statistical clustering of Luminous Red Galaxies in the photometric SDSS galaxy sample called MegaZ DR7. This is seen over the lowest multipoles in the angular power spectra C_{\ell} in four equally spaced redshift bins between 0.45 < z < 0.65. However, it is most prominent in the highest redshift band at ~ 4 sigma and it emerges at an effective scale k ~ 0.01 h Mpc^{-1}. Given that MegaZ DR7 is the largest cosmic volume galaxy survey to date (3.3 (Gpc h^{-1})^3) this implies an anomaly on the largest physical scales probed by galaxies. Alternatively, this signature could be a consequence of it appearing at the most systematically susceptible redshift. There are several explanations for this excess power that range from systematics to new physics. This could have important consequences for the next generation of galaxy surveys or the LCDM model. We test the survey, data and excess power, as well as possible origins. "
http://www.wired.com/wiredscience/2011/06/clumpy-universe/
The universe appears to be clumpier than astronomers expected, according to the largest galaxy survey to date. The extra clumps could call for a redesign of the standard model of cosmology, and maybe a new understanding of how gravity works.
Maybe on very large scales, Einsteins general relativity is slightly wrong, said cosmologist Shaun Thomas of University College London, lead author of a new paper in Physical Review Letters. This potentially could be one of the first signs that something peculiar is going on.
The universe appears to be clumpier than astronomers expected, according to the largest galaxy survey to date. The extra clumps could call for a redesign of the standard model of cosmology, and maybe a new understanding of how gravity works.
The result could mean cosmologists need to reassess their understanding of dark energy, the mysterious force that drives the universe outward at an ever-increasing rate. Dark energy itself is supposed to be almost perfectly smooth, but clumps of dark energy could draw clumps of visible matter around them.
The extra lumps could also mean dark energy doesnt exist at all. Instead, gravity could behave differently on very large scales than it does on smaller scales, meaning Einsteins theory of general relativity needs an overhaul.
Respectfully submitted for GTP member comments,
Dotini
Have a great night guys! 
