Journal Article

A new signature of primordial non-Gaussianities from the abundance of galaxy clusters

A. M. M. Trindade, P. P. Avelino and P. T. P. Viana

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 2, pages 1442-1447
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21331.x
A new signature of primordial non-Gaussianities from the abundance of galaxy clusters

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Abstract

The evolution with time of the abundance of galaxy clusters is very sensitive to the statistical properties of the primordial density perturbations. It can thus be used to probe small deviations from Gaussianity in the initial conditions. The characterization of such deviations would help distinguish between different inflationary scenarios and provide us with information on physical processes which took place in the early Universe. We have found that when the information contained in the galaxy cluster counts is used to reconstruct the dark energy equation of state as a function of redshift, assuming erroneously that no primordial non-Gaussianities exist, apparent evolution with time in the effective dark energy equation of state arises, characterized by the appearance of a clear discontinuity.

Keywords: dark energy; large-scale structure of Universe

Journal Article.  3242 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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