Non-Gaussianities, early Universe, and GRBs. Tracing the primeval state of the Universe with number counts of Gamma-Ray Bursts

TL;DR

This paper explores how primordial non-Gaussianities influence early universe structure formation and proposes using high-redshift Gamma-Ray Burst counts as a novel method to detect and distinguish these non-Gaussian effects.

Contribution

It introduces a new approach linking Gamma-Ray Burst counts to primordial non-Gaussianities, providing a potential observational probe of early universe conditions.

Findings

Gamma-Ray Burst counts vary with non-Gaussianity levels.

High-redshift GRB counts can distinguish non-Gaussian effects.

Proposed method enhances understanding of early universe structure formation.

Abstract

We investigate the effects of primordial non-Gaussianities in the primordial Universe on the baryonic structure formation process. By relating the cosmic star formation rate in Gaussian and non-Gaussian scenarios to the detectability of high-redshift sources of reionization, we derive the expected Gamma-Ray Burst rate in the different models. We find that counts of high-redshift Gamma-Ray Bursts can be used as cosmological probes of non-Gaussianities and that they are suitable candidates to distinguish non-Gaussian effects at early epochs.