A test for cosmic distance duality
Testing the cosmic distance duality relation (CDDR) constitutes an important task for cosmology and fundamental physics since any violation of it would be a clear evidence of new physics. In this paper, we propose a new test for the CDDR using only current measurements of the gas mass fraction of galaxy clusters from Sunyaev-Zeldovich (f{sub SZE}) and X-ray surface brightness (f{sub X−ray}) observations. We show that the relation between f{sub X−ray} and f{sub SZE} observations is given by f{sub SZE} = ηf{sub X−ray}, where η quantifies deviations from the CDDR. Since this latter expression is valid for the same object in a given galaxy cluster sample, the method proposed removes possible contaminations from different systematics error sources and redshift differences involved in luminosity and angular diameter distance measurements. We apply this cosmological model-independent methodology to the most recent f{sub X−ray} and f{sub SZE} data and show that no significant violation of the CDDR is found.
- OSTI ID:
- 22280007
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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