Loop-Induced Stochastic Bias at Small Wavevectors

Abstract

Primordial non-Gaussianities enhanced at small wavevectors can induce a power spectrum of the galaxy overdensity that differs greatly from that of the matter overdensity at large length scales. In previous work, it was shown that "squeezed" three-point and "collapsed" four-point functions of the curvature perturbation $\zeta$ can generate these non-Gaussianities and give rise to so-called scale-dependent and stochastic bias in the galaxy overdensity power spectrum. We explore a third way to generate non-Gaussianities enhanced at small wavevectors: the infrared behavior of quantum loop contributions to the four-point correlations of $\zeta$. We show that these loop effects lead to stochastic bias, which can be observable in the context of quasi-single field inflation.

arXiv comment10 pages, 4 figures

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Cited by in corpus (4)

• The Hunt for Primordial Interactions in the Large Scale Structures of the Universe
• On one-loop corrections to the Bunch-Davies wavefunction of the universe
• New Shapes of Primordial Non-Gaussianity from Quasi-Single Field Inflation with Multiple Isocurvatons
• De Sitter Quantum Loops as the origin of Primordial Non-Gaussianities