INVESTIGADORES
CALZETTA Esteban Adolfo
artículos
Título:
Self-consistent estimates of magnetic fields from reheating
Autor/es:
ALEJANDRA KANDUS; ESTEBAN CALZETTA
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
APS
Referencias:
Año: 2002 vol. 65 p. 1 - 20
ISSN:
0556-2821
Resumen:
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.