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Equal-time consistency relations in the large-scale structure of the universe

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Published in Modern Physics Letter. A. 2014, vol. 29, no. 1450152, p. 14
Abstract Consistency relations involving the soft limit of the (n + 1)-correlator functions of dark matter and galaxy overdensities have been recently obtained, thanks to the symmetries enjoyed by the Newtonian equations of motion describing the dark matter and galaxy fluids coupled through gravity. Via an appropriate change of coordinates, the symmetries allow to go to a frame where the zero mode and the first spatial gradient of the long and linear wavelength mode of the gravitational potential have been removed. In such a case, the response of the system on short scales is a uniform displacement leading to the vanishing of the correlators in the soft limit at the equal-time. In this paper, we show that equal-time consistency relations involving the soft limit of the (n + 1)-correlator functions of dark matter can be obtained if there is a well-defined relation between the linear growth factor D(a) and the abundance of dark matter Ω, dlnD(a)/dlna=Ωm1/2 . We also discuss the consequences of the consistency relations for the halo model.
Keywords BispectrumN-point correlation functionsConsistency relation
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KECHAGIAS, Alexandros, PERRIER, Hideki, RIOTTO, Antonio Walter. Equal-time consistency relations in the large-scale structure of the universe. In: Modern Physics Letter. A, 2014, vol. 29, n° 1450152, p. 14. https://archive-ouverte.unige.ch/unige:40678

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Deposited on : 2014-10-03

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