Cosmological-model-independent tests for the distance-duality relation from Galaxy Clusters and Type Ia Supernova

Дата и время публикации : 2011-01-27T11:02:49Z

Авторы публикации и институты :
Zhengxiang Li
Puxun Wu
Hongwei Yu

Ссылка на журнал-издание: ApJ, 729, L14 (2011)
Коментарии к cтатье: typos corrected, version published in APJL
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, astro-ph.GA, gr-qc

Краткий обзор статьи: We perform a cosmological-model-independent test for the distance-duality (DD) relation $eta(z)=D_L(z)(1+z)^{-2}/D_A(z)$, where $D_L$ and $D_A$ are the luminosity distance and angular diameter distance respectively, with a combination of observational data for $D_L$ taken from the latest Union2 SNe Ia and that for $D_A$ provided by two galaxy clusters samples compiled by De Filippis {it et al.} and Bonamente {it et al.}. Two parameterizations for $eta(z)$, i.e., $eta(z)=1+eta_0z$ and $eta(z)=1+eta_0z/(1+z)$, are used. We find that the DD relation can be accommodated at $1sigma$ confidence level (CL) for the De Filippis {it et al.} sample and at $3sigma$ CL for the Bonamente {it et al.} sample. We also examine the DD relation by postulating two more general parameterizations: $eta(z)=eta_0+eta_1z$ and $eta(z)=eta_0+eta_1z/(1+z)$, and find that the DD relation is compatible with the results from the De Filippis {it et al.} and the Bonamente {it et al.} samples at $1sigma$ and $2sigma$ CLs, respectively. Thus, we conclude that the DD relation is compatible with present observations.

Category: Physics