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Floerchinger, Stefan; Garny, Mathias; Katsis, Aris; Tetradis, Nikolaos; Wiedemann, Urs Achim

The dark matter bispectrum from effective viscosity and one-particle irreducible vertices. (English) Zbl 1541.83153

J. Cosmol. Astropart. Phys. 2019, No. 9, Paper No. 47, 26 p. (2019).
Summary: Dark matter evolution during the process of cosmological structure formation can be described in terms of a one-particle irreducible effective action at a characteristic scale \(k_m\) and a loop expansion below this scale, based on the effective propagators and vertices. We calculate the form of the effective vertices and compute the bispectrum of density perturbations within a one-loop approximation. We find that the effective vertices play a subdominant role as compared to the effective viscosity and sound velocity that modify the (inverse) propagators. For the bispectrum we reproduce the results of standard perturbation theory in the range where it is applicable, and find a slightly improved agreement with \(N\)-body simulations at larger wavenumbers.

Cited in 1 Document

MSC:

83F05 Relativistic cosmology
83C56 Dark matter and dark energy

Keywords:

power spectrum; baryon acoustic oscillations; dark energy; cosmological perturbation theory; bispectrum

Software:

CLASS
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Full Text: DOI arXiv

References:

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