Dark energy and some alternatives: a brief overview

被引:65
作者
Alcaniz, J. S. [1 ]
机构
[1] Observ Nacl, Dept Astron, BR-20921400 Rio De Janeiro, Brazil
关键词
dark energy; cosmological constant; extra dimensions;
D O I
10.1590/S0103-97332006000700002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The high-quality cosmological data, which became available in the last decade, have thrusted upon us a rather preposterous composition for the universe which poses one of the greatest challenges theoretical physics has ever faced: the so-called dark energy. By focusing our attention on specific examples of dark energy scenarios, we discuss three different candidates for this dark component, namely, a decaying vacuum energy or time-varying cosmological constant [Lambda(t)], a rolling homogeneous quintessence field (phi), and modifications in gravity due to extra spatial dimensions. As discussed, all these candidates [along with the vacuum energy or cosmological constant (Lambda)] seem somewhat to be able to explain the current observational results, which hampers any definitive conclusion on the actual nature of the dark energy.
引用
收藏
页码:1109 / 1117
页数:9
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