Effective Theory of Inflationary Magnetogenesis and Constraints on Reheating

Understand

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.