The Cosmological Slingshot Scenario in details |
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Authors: | Cristiano Germani Nicolás E Grandi and Alex Kehagias |
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Institution: | 1.SISSA and INFN,Trieste,Italy;2.IFLP-CONICET, cc67,La Plata,Argentina;3.Physics Division,National Technical University of Athens,Athens,Greece |
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Abstract: | 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. |
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