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The Effect of Non-Gaussian Primordial Perturbations on Large-Scale Structure

Published online by Cambridge University Press:  20 January 2023

G. A. Peña Open the ORCID record for G. A. Peña [Opens in a new window]  and
G. N. Candlish
G. A. Peña
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Gran Bretaña 1111, Valparaíso, Chile email: [email protected]
G. N. Candlish
Affiliation:
Instituto de Física y Astronomía, Universidad de Valparaíso, Gran Bretaña 1111, Valparaíso, Chile email: [email protected]
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Abstract

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The late-time effect of primordial non-Gaussianity offers a window into the physics of inflation and the very early Universe. In this work we study the consequences of a particular class of primordial non-Gaussianity that is fully characterized by initial density fluctuations drawn from a non-Gaussian probability density function, rather than by construction of a particular form for the primordial bispectrum. We numerically generate multiple realisations of cosmological structure and use the late-time matter polyspectra to determine the effect of these modified initial conditions. In this non-Gaussianity has only a small imprint on the first polyspectra, when compared to a standard Gaussian cosmology. Furthermore, some of our models present an interesting scale-dependent deviation from the Gaussian case in the bispectrum and trispectrum, although the signal is at most at the percent level.

Keywords

Large-scale structure of Universeinflationmethods: numerical
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S362: The Predictive Power of Computational Astrophysics as a Discovery Tool , June 2020 , pp. 26 - 32
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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