The cosmological slingshot scenario: A stringy early times universe

Germani, C; Grandi, N; Kehagias, A

dc.contributor.author	Germani, C	en
dc.contributor.author	Grandi, N	en
dc.contributor.author	Kehagias, A	en
dc.date.accessioned	2014-03-01T01:29:18Z
dc.date.available	2014-03-01T01:29:18Z
dc.date.issued	2008	en
dc.identifier.issn	0264-9381	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19216
dc.subject	Big Bang	en
dc.subject	Energy Conditions	en
dc.subject	Indexation	en
dc.subject	Turning Point	en
dc.subject	Angular Momentum	en
dc.subject	calabi yau	en
dc.subject	High Energy Density	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Physics, Multidisciplinary	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	D=10 SUPERGRAVITY	en
dc.subject.other	BRANE INFLATION	en
dc.subject.other	COMPACTIFICATION	en
dc.subject.other	GRAVITY	en
dc.subject.other	DIMENSIONS	en
dc.subject.other	MILLIMETER	en
dc.subject.other	N=2	en
dc.title	The cosmological slingshot scenario: A stringy early times universe	en
heal.type	journalArticle	en
heal.identifier.primary	10.1088/0264-9381/25/13/135004	en
heal.identifier.secondary	http://dx.doi.org/10.1088/0264-9381/25/13/135004	en
heal.identifier.secondary	135004	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	A cosmological model for the early time universe is proposed. In this model, the universe is a wandering brane moving in a warped throat of a Calabi-Yau space. A nonzero angular momentum induces a turning point in the brane trajectory, and leads to a bouncing cosmology as experienced by an observer living on the brane. The universe undergoes a decelerated contraction followed by an accelerating expansion and no big-bang singularity. Although the number of e-folds of accelerated motion is low (less than 2), standard cosmological problems are not present in our model; thanks to the absence of an initial singularity and the violation of energy conditions of mirage matter at high energies. Density perturbations are also calculated in our model and we find a slightly red spectral index with negligible tensorial perturbations in compatibility with WMAP data. © 2008 IOP Publishing Ltd.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	Classical and Quantum Gravity	en
dc.identifier.doi	10.1088/0264-9381/25/13/135004	en
dc.identifier.isi	ISI:000256841400004	en
dc.identifier.volume	25	en
dc.identifier.issue	13	en