Self-consistent estimates of magnetic fields from reheating

Mostrar todas las versiones(4)

We investigate the generation of primordial magnetic fields from stochastic currents created by the cosmological transition from inflation to reheating. We consider N charged scalar fields coupled to the electromagnetic field in a curved background and derive self-consistent equations for the evolut...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Calzetta, E., Kandus, A.
Formato:	JOUR
Materias:	article calculation conductance cosmological phenomena dynamics electric current electromagnetic field heating infrared spectroscopy magnetic field physics
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_05562821_v65_n6_p_Calzetta
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_05562821_v65_n6_p_Calzetta
record_format	dspace
spelling	todo:paper_05562821_v65_n6_p_Calzetta2023-10-03T15:35:46Z Self-consistent estimates of magnetic fields from reheating Calzetta, E. Kandus, A. article calculation conductance cosmological phenomena dynamics electric current electromagnetic field heating infrared spectroscopy magnetic field physics We investigate the generation of primordial magnetic fields from stochastic currents created by the cosmological transition from inflation to reheating. We consider N charged scalar fields coupled to the electromagnetic field in a curved background and derive self-consistent equations for the evolution of the two point functions of the fields, which in the large-N limit give a decoupled set for the scalar and the electromagnetic functions. The main contribution to the electric current comes from the infrared portion of the spectrum of created particles, and in this limit the damping of the magnetic field is not due to normal conductivity but to London currents in the scalar field. For a given set of the physical parameters of the problem, we solved this equation numerically and found that, due to the fact that the London currents are oscillating, the field actually grows exponentially during the time interval in which our large-N limit equations are valid. Although for the chosen parameters the induced field is weak, the present uncertainties on their actual values leave open the possibility for higher intensities. © 2002 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_05562821_v65_n6_p_Calzetta
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	article calculation conductance cosmological phenomena dynamics electric current electromagnetic field heating infrared spectroscopy magnetic field physics
spellingShingle	article calculation conductance cosmological phenomena dynamics electric current electromagnetic field heating infrared spectroscopy magnetic field physics Calzetta, E. Kandus, A. Self-consistent estimates of magnetic fields from reheating
topic_facet	article calculation conductance cosmological phenomena dynamics electric current electromagnetic field heating infrared spectroscopy magnetic field physics
description	We investigate the generation of primordial magnetic fields from stochastic currents created by the cosmological transition from inflation to reheating. We consider N charged scalar fields coupled to the electromagnetic field in a curved background and derive self-consistent equations for the evolution of the two point functions of the fields, which in the large-N limit give a decoupled set for the scalar and the electromagnetic functions. The main contribution to the electric current comes from the infrared portion of the spectrum of created particles, and in this limit the damping of the magnetic field is not due to normal conductivity but to London currents in the scalar field. For a given set of the physical parameters of the problem, we solved this equation numerically and found that, due to the fact that the London currents are oscillating, the field actually grows exponentially during the time interval in which our large-N limit equations are valid. Although for the chosen parameters the induced field is weak, the present uncertainties on their actual values leave open the possibility for higher intensities. © 2002 The American Physical Society.
format	JOUR
author	Calzetta, E. Kandus, A.
author_facet	Calzetta, E. Kandus, A.
author_sort	Calzetta, E.
title	Self-consistent estimates of magnetic fields from reheating
title_short	Self-consistent estimates of magnetic fields from reheating
title_full	Self-consistent estimates of magnetic fields from reheating
title_fullStr	Self-consistent estimates of magnetic fields from reheating
title_full_unstemmed	Self-consistent estimates of magnetic fields from reheating
title_sort	self-consistent estimates of magnetic fields from reheating
url	http://hdl.handle.net/20.500.12110/paper_05562821_v65_n6_p_Calzetta
work_keys_str_mv	AT calzettae selfconsistentestimatesofmagneticfieldsfromreheating AT kandusa selfconsistentestimatesofmagneticfieldsfromreheating
_version_	1807323244468895744

Self-consistent estimates of magnetic fields from reheating

Ejemplares similares