INVESTIGADORES
BELLINI Mauricio
artículos
Título:
Collapse driven by a scalar field without final singularity
Autor/es:
JAIME MENDOZA HERNÁNDEZ; MAURICIO BELLINI; CLAUDIA MORENO
Revista:
PHYSICS OF THE DARK UNIVERSE
Editorial:
Elsevier Science
Referencias:
Lugar: Amsterdam; Año: 2019 vol. 23 p. 100251 - 100251
Resumen:
We explore a collapsing cosmology driven by a scalar field which is minimally coupled to gravity in a spatially flat and spherically symmetric, isotropic and homogeneous space-time, with a variable timescale that avoid the final singularity. The equation of state that describes thecollapse is $omega=1$. We calculate the back-reaction of the space-time during the collapse and the energy density fluctuations related to this back-reaction has a spectral index $n_s=0$, favouring short-wavelengths modes to be detected. The interesting is that the amplitude of these fluctuations increase with time when the collapse is sufficiently strong.
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