Chaplygin气体与精细结构常数的宇宙学演化(英文)

Chaplygin气体作为暗能量的候选者,可以由标量场来实现.该标量场又同时使得精细结构常数α随着宇宙的演化而演化.在十多年之前,人们对类星体的观测中发现了这一现象,并引起了国内外学者的广泛关注.本文作者考虑了各种Chaplygin气体模型,并与试验进行比较,发现只要暗能量的状态方程参数不是严格等于-1,这些模型都能很好地解释Δα/α的变化.此外,等效原理依然是成立的.

Chaplygin gas and the cosmological evolution of alpha

The class of Chaplygin gas models regarded as a candidate of dark energy can be realized by a scalar field,which could drive the variation of the fine structure constant c~ during the cosmic time. This phenomenon has been observed for almost ten years ago from the quasar absorption spectra and attracted many attentions. In this paper, the authors reconstruct the class of Chaplygin gas models to a kind of scalar fields and confront the resulting Ao~/o~ with the observational constraints. It is found that if the present observational value of the equation of state of the dark energy was not exact- ly equal to - 1, various parameters of the class of Chaplygin gas models are allowed to satisfy the ob- servational constraints, as well as the equivalence principle is also respected.