Effective theory of inflationary magnetogenesis and constraints on reheating

Abstract Effective theory framework based on symmetry has recently gained widespread interest in the field of cosmology. In this paper, we apply same idea genesis primordial magnetic and its evolution throughout cosmological universe. Given broken time-diffeomorphism by background, considered most general Lagrangian electromagnetic metric fluctuation up to second order, which naturally breaks conformal (EM) sector. We also include parity violation sector with motivation that potential observational significance. such a set-up, explore EM, scalar, tensor perturbations considering different constraints. our analysis emphasize role played intermediate reheating phase got limited all previous studies. Assuming vanishing electrical conductivity during entire period reheating, well-known Faraday induction been shown play crucial enhancing strength present-day field. show how physical effects combined PLANCK large scale observation makes class models viable severely restricts equation state parameter within very narrow range 0.01 < ? eff 0.27, is nearly independent scenarios have considered.