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Gravity

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A discriminating probe of gravity at cosmological scales

周六, 03/08/2008 - 14:27 — kambrian
Authors:
Pengjie Zhang (SHAO),
Michele Liguori (Cambridge),
Rachel Bean (Cornell),
Scott Dodelson (Fermilab/Chicago)

Quantum bounce and cosmic recall

周六, 10/27/2007 - 08:36 — kambrian
Authors:
Alejandro Corichi,Parampreet Singh
(Submitted on 24 Oct 2007)

Abstract: Loop quantum cosmology predicts that, in simple models, the big bang
singularity of classical general relativity is replaced by a quantum bounce.

反物质与反引力

周四, 10/25/2007 - 04:28 — kambrian
原文作者：Dragan Slavkov Hajdukovic于23／10／2007
摘要译文：
迄今我们并不清楚反物质的引力性质。一种可能的结果是物质和反物质间存在排斥力（可称为反引力）。我们指出反引力的存在将带来的两种可能的迹象：

Constraining a possible time variation of the gravitational constant G with terrestrial nuclear laboratory data

周四, 10/25/2007 - 04:00 — kambrian
Authors:
P. G. Krastev,
B. A. Li (Texas A&M University-Commerce)
(Submitted on 26 Feb 2007 (v1), last revised 23 Oct 2007 (this version, v2))

Abstract: Testing the constancy of the gravitational constant G has been a longstanding

Differentiating dark energy and modified gravity with galaxy redshift surveys. (arXiv:0710.3885v1 [astro-ph])

周二, 10/23/2007 - 16:34 — kambrian

Differentiating dark energy and modified gravity with galaxy redshift surveys. (arXiv:0710.3885v1 [astro-ph]) -

The observed cosmic acceleration today could be due to an unknown energy
component (dark energy), or a modification to general relativity (modified
gravity). If dark energy models and modified gravity models are required to
predict the same cosmic expansion history H(z), they will predict different
growth rate for cosmic large scale structure, $f_g(z)=d\ln \delta/d\ln a