INVESTIGADORES
GRANDI Nicolas Esteban
artículos
Título:
The cosmological slingshot scenario: a stringy early times universe
Autor/es:
C.GERMANI; N. GRANDI; A. KEHAGIAS
Revista:
CLASSICAL AND QUANTUM GRAVITY
Editorial:
Institute of Physics and IOP Publishing Limited 2008.
Referencias:
Lugar: London; Año: 2008 vol. 25 p. 1 - 32
ISSN:
0264-9381
Resumen:
We generalize the Cosmological Slingshot
Scenario for a Slingshot brane moving in a Klebanov-Strassler throat. We
show that the horizon and isotropy problems of standard cosmology are
avoided, while the flatness problem is acceptably alleviated. Regarding
the primordial perturbations, we identify their vacuum state and
elucidate the evolution from the quantum to the classical regimes. Also,
we calculate their exact power spectrum showing its compatibility with
current data. We discuss the bouncing solution from a four dimensional
point of view. In this framework the radial and angular motion of the
Slingshot brane are described by two scalar fields. We show that the
bouncing solution for the scale factor in String frame is mapped into a
monotonically increasing (in conformal time) solution in the Einstein
frame. We finally discuss about the regularity of the geometry in
Einstein frame.