123 research outputs found
Primordial black hole production during preheating in a chaotic inflationary model
In this paper we review the production of primordial black holes (PBHs)
during preheating after a chaotic inflationary model. All relevant equations of
motion are solved numerically in a modified version of HLattice, and we then
calculate the mass variance to determine structure formation during preheating.
It is found that production of PBHs can be a generic result of the model, even
though the results seem to be sensitive to the values of the smoothing scale.
We consider a constraint for overproduction of PBHs that could uncover some
stress between inflation-preheating models and observations.Comment: 6 pages, 5 figures. Prepared for the conference proceedings of the
9th Mexican School on Gravitation and Mathematical Physics : Cosmology for
the XXI Century: Inflation, Dark Matter and Dark Energ
Cosmological constraints for a two brane-world system with single equation of state
We present the study of two 3-brane system embedded in a 5-dimensional
space-time in which the fifth dimension is compactified on a
orbifold. Assuming isotropic, homogeneous, and static branes, it can be shown
that the dynamics of one brane is dominated by the other one when the metric
coefficients have a particular form. We study the resulting cosmologies when
one brane is dominated by a given single-fluid component.Comment: This work was presented at the VIII Taller of the DGFM, Tuxtla
Gutierrez, Chiapas, Mexico noviembre 22-26, 201
Two-brane system in a vacuum bulk with a single equation of state
We study the cosmology of a two-brane model in a five-dimensional spacetime,
where the extra spatial coordinate is compactifed on an orbifold. Additionally,
we consider the existence on each brane of matter fields that evolve in time.
Solving the Einstein equations in a vacuum bulk, we can show how the matter
fields in both branes are connected and they do not evolve independentlyComment: This work was presented at the IX Taller de la Division de
Gravitacion y Fisica Matematica, Colima 201
Gravitational cooling of self-gravitating Bose-Condensates
Equilibrium configurations for a self-gravitating scalar field with
self-interaction are constructed. The corresponding Schr\"odinger-Poisson (SP)
system is solved using finite differences assuming spherical symmetry. It is
shown that equilibrium configurations of the SP system are late-time attractor
solutions for initially quite arbitrary density profiles, which relax and
virialize through the emission of scalar field bursts; a process dubbed
gravitational cooling. Among other potential applications, these results
indicate that scalar field dark matter models (in its different flavors)
tolerate the introduction of a self-interaction term in the SP equations. This
study can be useful in exploring models in which dark matter in galaxies is not
point-like.Comment: 10 aastex pages, 12 eps figures. Accepted for publication in Ap
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