Detectability of large correlation length inflationary magnetic field with Cherenkov telescopes

TL;DR

This paper investigates whether gamma-ray observations with Cherenkov telescopes can identify the inflationary origin of large-scale magnetic fields in cosmic voids by detecting characteristic gamma-ray emission asymmetries.

Contribution

It proposes a novel method using gamma-ray astronomy to distinguish inflationary magnetic fields from other origins based on emission asymmetries.

Findings

Nearby blazars can be used to test inflationary magnetic field origin.

CTA observations in the 0.1-1 TeV band can reveal characteristic asymmetries.

Method offers a new way to probe early Universe magnetic fields.

Abstract

Magnetic fields occupying the voids of the large scale structure may be a relic from the Early Universe originating from either Inflation or from cosmological phase transitions. We explore the possibility of identifying the inflationary origin of the void magnetic fields and measuring its parameters with gamma-ray astronomy methods. The large correlation length inflationary field is expected to impose a characteristic asymmetry of extended gamma-ray emission that is correlated between different sources on the sky. We show that a set of nearby blazars for which the extended emission is observable in the 0.1-1 TeV band with CTA can be used for the test of inflationary origin of the void magnetic fields.