Qi 2009 超新星和伽玛暴限制宇宙学常数

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暗能量的状态方程好像大于-1

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Title:		Deviation from the Cosmological Constant or Systematic Errors?
Authors:		Qi, Shi; Lu, Tan; Wang, Fa-Yin
Publication:		eprint arXiv:0904.2832
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		4 pages, 4 figures
Bibliographic Code:		2009arXiv0904.2832Q

Abstract

Motivated by the fact that both SNe Ia and GRBs seem to prefer a dark energy EOS greater than -1 at redshifts $z \gtrsim 0.5$, we perform a careful investigation on this situation. We find that the deviation of dark energy from the cosmological constant at redshifts $z \gtrsim 0.5$ is large enough that we should pay close attention to it with future observational data. Such a deviation may arise from some biasing systematic errors in the handling of SNe Ia and/or GRBs or more interestingly from the nature of the dark energy itself.

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