Cosmological Models with Linearly Varying Deceleration Parameter

被引：160

作者：

Akarsu, OzguR ^{[1
]}

Dereli, Tekin ^{[1
]}

机构：

[1] Koc Univ, Dept Phys, TR-34450 Istanbul, Turkey

来源：

INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2012年 / 51卷 / 02期

关键词：

Cosmological solutions; Variable deceleration parameter; Accelerating universe; Dark energy; Big rip; COSMIC ACCELERATION; DARK ENERGY; CONSTRAINTS; DYNAMICS;

D O I：

10.1007/s10773-011-0941-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose a new law for the deceleration parameter that varies linearly with time and covers Berman's law where it is constant. Our law not only allows one to generalize many exact solutions that were obtained assuming constant deceleration parameter, but also gives a better fit with data (from SNIa, BAO and CMB), particularly concerning the late time behavior of the universe. According to our law only the spatially closed and flat universes are allowed; in both cases the cosmological fluid we obtain exhibits quintom like behavior and the universe ends with a big-rip. This is a result consistent with recent cosmological observations.

引用

页码：612 / 621

页数：10

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