Effective theory of inflationary magnetogenesis and constraints on reheating

Effective theory framework based on symmetry has recently gained widespread interest in the field of cosmology. In this paper, we apply the same idea on the genesis of the primordial magnetic field and its evolution throughout the cosmological universe. Given the broken time-diffeomorphism symmetry...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2021-05, Vol.2021 (5), p.45
Main Authors: Maity, Debaprasad, Pal, Sourav, Paul, Tanmoy
Format: Article
Language:English
Subjects:
cosmological parameters from CMBR
Cosmology
Electrical resistivity
Electromagnetic induction
Equations of state
Evolution
Heating
inflation
Isomorphism
Magnetic fields
Perturbation
primordial magnetic fields
quantum field theory on curved space
Symmetry
Tensors
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Summary:Effective theory framework based on symmetry has recently gained widespread interest in the field of cosmology. In this paper, we apply the same idea on the genesis of the primordial magnetic field and its evolution throughout the cosmological universe. Given the broken time-diffeomorphism symmetry by the cosmological background, we considered the most general Lagrangian of electromagnetic and metric fluctuation up to second order, which naturally breaks conformal symmetry in the electromagnetic (EM) sector. We also include parity violation in the electromagnetic sector with the motivation that has potential observational significance. In such a set-up, we explore the evolution of EM, scalar, and tensor perturbations considering different observational constraints. In our analysis we emphasize the role played by the intermediate reheating phase which has got limited interest in all the previous studies. Assuming the vanishing electrical conductivity during the entire period of reheating, the well-known Faraday electromagnetic induction has been shown to play a crucial role in enhancing the strength of the present-day magnetic field. We show how such physical effects combined with the PLANCK and the large scale magnetic field observation makes a large class of models viable and severely restricts the reheating equation of state parameter within a very narrow range of 0.01 < ω eff < 0.27, which is nearly independent of reheating scenarios we have considered.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/05/045