Author:
Teppa Pannia Florencia Anabella,Perez Bergliaffa Santiago Esteban,Pinto-Neto Nelson
Abstract
Abstract
We investigate the creation of scalar particles inside a
region delimited by a bubble which is expanding with non-zero
acceleration. The bubble is modelled as a thin shell and plays the
role of a moving boundary, thus influencing the fluctuations of the
test scalar field inside it. Bubbles expanding in Minkowski
spacetime as well as those dividing two de Sitter spacetimes are
explored in a unified way. Our results for the Bogoliubov
coefficient βk
when considering only the squeezing effects
show that in all cases the creation of scalar particles decreases
with the mass, and is much more significant in the case of nonzero
curvature. They also show that the dynamics of the bubble and its
size are relevant for particle creation, but in the dS-dS case the
combination of both effects leads to a behaviour different from that
of Minkowski space-time, due to the presence of a length scale (the
Hubble radius of the internal geometry).
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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