39 citations · 135 across the 11 of their papers we have counts for
4 papers · 1 filter
Momentum spectra of particles produced in a single pulse of an electric field
Takashi Arai
We study particle creation in a single pulse of an electric field in scalar quantum electrodynamics. We first identify parameter regions of the theory where the dynamical pair crea…
Effective potential and Goldstone bosons in de Sitter space
Takashi Arai
We investigate nonperturbative infrared effects for the O(N) linear sigma model in de Sitter space using the two-particle irreducible effective action at the Hartree truncation lev…
Renormalization of the 2PI Hartree-Fock approximation on de Sitter background in the broken phase
Takashi Arai
The infrared effects for light minimally coupled scalar fields with quartic self-interaction in de Sitter space is investigated using the 2PI effective action formalism. This forma…
Nonperturbative infrared effects for light scalar fields in de Sitter space
Takashi Arai
We study the phi^4 scalar field theory in de Sitter space using the 2PI effective action formalism. This formalism enables us to investigate the nonperturbative quantum effects. We…