Cosmological evolution in a type-0 string theory

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

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.contributor.author	Pappa, I	en
dc.date.accessioned	2014-03-01T01:17:40Z
dc.date.available	2014-03-01T01:17:40Z
dc.date.issued	2002	en
dc.identifier.issn	0217-751X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14612
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	article	en
dc.subject.other	calculation	en
dc.subject.other	cosmos	en
dc.subject.other	energy	en
dc.subject.other	model	en
dc.subject.other	quantum theory	en
dc.subject.other	space	en
dc.subject.other	time	en
dc.subject.other	vacuum	en
dc.title	Cosmological evolution in a type-0 string theory	en
heal.type	journalArticle	en
heal.identifier.primary	10.1142/S0217751X02010534	en
heal.identifier.secondary	http://dx.doi.org/10.1142/S0217751X02010534	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	We study the cosmological evolution of a type-0 string theory by employing noncriticality, which may be induced by fluctuations of the D3 brane worlds. We check the consistency of the approach to O(alpha') in the corresponding sigma-model. The ten-dimensional theory is reduced to an effective four-dimensional model, with only time dependent fields. We show that the four-dimensional universe has an inflationary phase and graceful exit from it, while the other extra dimensions are stabilized to a constant value, with the fifth dimension much larger than the others. We pay particular attention to demonstrating the role of tachyonic matter in inducing these features. The universe asymptotes, for large times, to a nonaccelerating linearly-expanding universe with a time-dependent dilaton and a relaxing to zero vacuum energy a 16 quintessence. Our perturbative string solution appears to have initial singularities (Big Bang type), which however, we believe, may be lifted in a nonperturbative way, and they do not represent true singularities of the string theory.	en
heal.publisher	WORLD SCIENTIFIC PUBL CO PTE LTD	en
heal.journalName	International Journal of Modern Physics A	en
dc.identifier.doi	10.1142/S0217751X02010534	en
dc.identifier.isi	ISI:000177077600001	en
dc.identifier.volume	17	en
dc.identifier.issue	17	en
dc.identifier.spage	2241	en
dc.identifier.epage	2265	en