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- A. Ramazani-Moghaddam-Arani2 profiles14 · h 12
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10 papers · 1 filter
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$\rm…
Spinning Toroidal Brane Cosmology; A Classical and Quantum Survey
Salman Abarghouei Nejad, Mehdi Dehghani, Majid Monemzadeh
We construct a cosmological model based on a free particle model which is constrained on an embedded toroidal brane, with a general rotation around a specific axis in the bulk spac…
Effect of a magnetic field on Schwinger mechanism in de Sitter spacetime
Ehsan Bavarsad, Sang Pyo Kim, Clément Stahl +1
We investigate the effect of a constant magnetic field background on the scalar QED pair production in a four-dimensional de Sitter spacetime ($\dsf$). We have obtained the pair pr…
Dynamical Structure of the Fields in the Light Cone Coordinates
Kianoosh Kargar, Ahmad Shirzad, Majid Monemzadeh
It is well-known that additional constraints emerge in light cone coordinates. We enumerate the number of physical modes in light cone coordinates and compare it with conventional…