Collapse driven by a scalar field without final singularity

JAIME MENDOZA HERNÁNDEZ; MAURICIO BELLINI; CLAUDIA MORENO

PHYSICS OF THE DARK UNIVERSE

Elsevier Science

Lugar: Amsterdam; Año: 2019 vol. 23 p. 100251 - 100251

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.