The Mass Function of Void Groups as a Probe of the Primordial non-Gaussianity

Details The Mass Function of Void Groups as a Probe of the Primordial non-Gaussianity The Mass Function of Void Groups as a Probe of the Primordial non-Gaussianity

2008-11-09

arxiv.org/abs/0811.1339v2

Astrophys.J.701:L25-L28,2009

Astronomy and Astrophysics

Astrophysics

ApJL in press, revised version, 4 pages, 3 figures, analytic models explained more clearly, contour plots revised, discussion

Scientific paper

10.1088/0004-637X/701/1/L25

The primordial non-Gaussianity signal, if measured accurately, will allow us to distinguish between different candidate models for the cosmic inflation. Since the galaxy groups located in void regions are rare events, their abundance may be a sensitive probe of the primordial non-Gaussianity. We construct an analytic model for the mass function of void groups in the framework of the extended Press-Schechter theory with non-Gaussian initial conditions and investigate how it depends on the primordial non-Gaussianity parameter. A feasibility study is conducted by fitting the analytic mass function of void groups to the observational results from the galaxy group catalog of the Sloan Digital Sky Survey Data Release 4 with adjusting the primordial non-Gaussianity parameter.

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