72 citations · 181 across the 10 of their papers we have counts for
11 papers
Scalar QED effective action in dS: implications for primordial magnetogenesis and the running of coupling constants
Ehsan Bavarsad, Sang Pyo Kim, Clément Stahl +1
Particles creation and vacuum polarization under the influence of both an electromagnetic field and a de~Sitter (dS) spacetime nonperturbatively probes quantum electrodynamics (QED…
Induced energy-momentum tensor in de Sitter scalar QED and its implication for induced current
Omid Gholizadeh Meimanat, Ehsan Bavarsad
The aim of this research is to investigate the vacuum energy-momentum tensor of a quantized, massive, nonminimally coupled scalar field induced by a uniform electric field backgrou…
Energy-momentum tensor and effective Lagrangian of scalar QED with a nonminimal coupling in 2D de Sitter spacetime
Marzieh Akbari Ahmadmahmoudi, Ehsan Bavarsad
We have studied the induced one-loop energy-momentum tensor of a massive complex scalar field within the framework of nonperturbative quantum electrodynamics (QED) with a uniform e…
Induced energy-momentum tensor of Dirac field in 2D de Sitter QED
Manizheh Botshekananfard, Ehsan Bavarsad
We compute the expectation value of the energy-momentum tensor in the in-vacuum state of the quantized Dirac field coupled to a uniform electric field background on the Poincar$\rm…
Effect of Schwinger pair production on the evolution of the Hubble constant in de~Sitter spacetime
Ehsan Bavarsad, Sang Pyo Kim, Clément Stahl +1
In this proceeding we consider a massive charged scalar field in a uniform electric field background in a de~Sitter spacetime (dS). We compute the in-vacuum expectation value of th…
Effect of a magnetic field on Schwinger mechanism in de Sitter spacetime
Ehsan Bavarsad, Sang Pyo Kim, Clément Stahl +1
We investigate the effect of a constant magnetic field background on the scalar QED pair production in a four-dimensional de Sitter spacetime ($\dsf$). We have obtained the pair pr…