COSMOLOGICAL-MODEL-INDEPENDENT TESTS FOR THE DISTANCE-DUALITY RELATION FROM GALAXY CLUSTERS AND TYPE Ia SUPERNOVA
- Department of Physics and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, Hunan 410081 (China)
We perform a cosmological-model-independent test for the distance-duality (DD) relation {eta}(z) = D{sub L} (z)(1 + z){sup -2}/D{sub A} (z), where D{sub L} and D{sub A} are the luminosity distance and angular diameter distance, respectively, with a combination of observational data for D{sub L} taken from the latest Union2 SNe Ia and that for D{sub A} provided by two galaxy cluster samples compiled by De Filippis et al. and Bonamente et al. Two parameterizations for {eta}(z), i.e., {eta}(z) = 1 + {eta}{sub 0} z and {eta}(z) = 1 + {eta}{sub 0} z/(1 + z), are used. We find that the DD relation can be accommodated at 1{sigma} confidence level (CL) for the De Filippis et al. sample and at 3{sigma} CL for the Bonamente et al. sample. We also examine the DD relation by postulating two more general parameterizations: {eta}(z) = {eta}{sub 0} + {eta}{sub 1} z and {eta}(z) = {eta}{sub 0} + {eta}{sub 1} z/(1 + z), and find that the DD relation is compatible with the results from the De Filippis et al. and the Bonamente et al. samples at 1{sigma} and 2{sigma} CLs, respectively. Thus, we conclude that the DD relation is compatible with present observations.
- OSTI ID:
- 21560461
- Journal Information:
- Astrophysical Journal Letters, Vol. 729, Issue 1; Other Information: DOI: 10.1088/2041-8205/729/1/L14; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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