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 ga...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2012-06, Vol.2012 (6), p.1-10
Main Authors: Holanda, R FL, Goncalves, R S, Alcaniz, J S
Format: Article
Language:English
Subjects:
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BRIGHTNESS
COSMOLOGICAL MODELS
COSMOLOGY
Deviation
DISTANCE
DUALITY
Galactic clusters
GALAXY CLUSTERS
LUMINOSITY
MASS
RED SHIFT
Sunyaev-Zeldovich effect
Systematic errors
Tasks
X RADIATION
X-rays
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Summary: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) = f sub(X-ray), where 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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/06/022