Acceleration of the universe in type-O noncritical strings

Diamandis, GA; Georgalas, BC; Mavromatos, NE; Papantonopoulos, E

dc.contributor.author	Diamandis, GA	en
dc.contributor.author	Georgalas, BC	en
dc.contributor.author	Mavromatos, NE	en
dc.contributor.author	Papantonopoulos, E	en
dc.date.accessioned	2014-03-01T01:17:25Z
dc.date.available	2014-03-01T01:17:25Z
dc.date.issued	2002	en
dc.identifier.issn	0217-751X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14516
dc.subject	Cosmology	en
dc.subject	Noncritical strings	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	acceleration	en
dc.subject.other	article	en
dc.subject.other	cosmos	en
dc.subject.other	model	en
dc.subject.other	phenomenology	en
dc.subject.other	quantum theory	en
dc.subject.other	theory	en
dc.title	Acceleration of the universe in type-O noncritical strings	en
heal.type	journalArticle	en
heal.identifier.primary	10.1142/S0217751X02010893	en
heal.identifier.secondary	http://dx.doi.org/10.1142/S0217751X02010893	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Presently there is preliminary observational evidence that the cosmological constant might be nonzero, and hence that our universe is eternally accelerating (de Sitter). This poses fundamental problems for string theory, since a scattering matrix is not well defined in such universes. In a previous paper we have presented a model, based on (nonequilibrium) noncritical strings, which is characterized by eventual ""graceful"" exit from a de Sitter phase. The model is based on a type-0 string theory, involving D3 brane worlds, whose initial quantum fluctuations induce the noncriticality. We argue in this paper that this model is compatible with the current observations. A crucial role for the correct ""phenomenology"" of the model is played by the relative magnitude of the flux of the five-form of the type 0 string to the size of five of the extra dimensions, transverse to the direction of the flux-field. We do not claim, at this stage at least, that this model is a realistic physical model for the universe, but we find it interesting that the model cannot be ruled out immediately, at least on phenomenological grounds.	en
heal.publisher	WORLD SCIENTIFIC PUBL CO PTE LTD	en
heal.journalName	International Journal of Modern Physics A	en
dc.identifier.doi	10.1142/S0217751X02010893	en
dc.identifier.isi	ISI:000179627400005	en
dc.identifier.volume	17	en
dc.identifier.issue	30	en
dc.identifier.spage	4567	en
dc.identifier.epage	4589	en