Anisotropic spacetimes in homogeneous string cosmology

Batakis, NA; Kehagias, AA

dc.contributor.author	Batakis, NA	en
dc.contributor.author	Kehagias, AA	en
dc.date.accessioned	2014-03-01T01:10:49Z
dc.date.available	2014-03-01T01:10:49Z
dc.date.issued	1995	en
dc.identifier.issn	0550-3213	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11458
dc.subject	Cosmological Constant	en
dc.subject	Early Universe	en
dc.subject	Effective Action	en
dc.subject	General Relativity	en
dc.subject	General Solution	en
dc.subject	Leading Order	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	GAUGED WZW MODELS	en
dc.subject.other	EXPANDING UNIVERSE	en
dc.subject.other	DUALITY	en
dc.subject.other	BACKGROUNDS	en
dc.subject.other	DIMENSIONS	en
dc.subject.other	SYMMETRIES	en
dc.subject.other	INFLATION	en
dc.title	Anisotropic spacetimes in homogeneous string cosmology	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0550-3213(95)00249-R	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0550-3213(95)00249-R	en
heal.language	English	en
heal.publicationDate	1995	en
heal.abstract	The dynamics of the early universe may have been profoundly influenced by spatial anisotropies. A search for such backgrounds in the context of string cosmology has uncovered the existence of an entire class of 4D spatially homogeneous but not necessarily isotropic spacetimes, analogous to the class of Bianchi-type models in general relativity. Leading-order solutions with vanishing cosmological constant but with non-vanishing dilaton and antisymmetric field are explicitly found for all types. This is a new class of solutions, whose isotropy limits reproduce all known and, further, all possible FRW-type of models in the string effective-action context considered. There is always an initial singularity and no inflation. Other features of the general solutions, including their behavior under abelian T duality are also discussed.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Nuclear Physics B	en
dc.identifier.doi	10.1016/0550-3213(95)00249-R	en
dc.identifier.isi	ISI:A1995RR93600013	en
dc.identifier.volume	449	en
dc.identifier.issue	1-2	en
dc.identifier.spage	248	en
dc.identifier.epage	264	en