Measuring the chaplygin gas equation of state from angular and luminosity distances

被引：26

作者：

Alcaniz, JS

Lima, JAS

机构：

[1] Univ Fed Rio Grande do Norte, Dept Fis, BR-59072970 Natal, RN, Brazil

[2] Observ Natl, BR-20921400 Rio De Janeiro, RJ, Brazil

[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo, SP, Brazil

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 618卷 / 01期

关键词：

cosmological parameters; dark matter; equation of state;

D O I：

10.1086/425860

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

An exotic dark component, called generalized Chaplygin gas (Cg) and parameterized by an equation of state p = -A/rho(Cg)(alpha), where A and alpha are arbitrary constants, is one of the possible candidates for dark energy as well as for a unified scenario of dark matter and dark energy. In this paper we investigate qualitative and quantitative aspects of the angular size-redshift test in cosmological models driven by such a dark component. We discuss the prospects for constraining the Cg equation of state from measurements of the angular size at low- and high-redshift radio sources and also from a joint analysis involving angular size and supernova data. A detailed discussion about the influence of the Cg on the minimal redshift at which the angular size of an extragalactic source takes its minimal value is also presented.

引用

页码：16 / 22

页数：7

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