\$tring Theory and an Accelerating Universe

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dc.creatorEllis, John
dc.creatorMavromatos, N. E.
dc.creatorNanopoulos, D. V.
dc.date2001-05-21
dc.date.accessioned2026-07-07T04:11:42Z
dc.date.available2026-07-07T04:11:42Z
dc.descriptionAn accelerating Universe can be accommodated naturally within non-critical string theory, in which scattering is described by a superscattering matrix \$ that does not factorize as a product of $S$- and $S^\dagger$-matrix elements and time evolution is described by a modified Liouville equation characteristic of open quantum-mechanical systems. We describe briefly alternative representations in terms of the stochastic Ito and Fokker-Planck equations. The link between the vacuum energy and the departure from criticality is stressed. We give an explicit example in which non-marginal \$tring couplings cause a departure from criticality, and the corresponding cosmological vacuum energy relaxes to zero à la quintessence.
dc.description11 pages LATEX, one eps figure incorporated
dc.identifierhttps://arxiv.org/abs/hep-th/0105206
dc.identifierhttp://arxiv.org/abs/hep-th/0105206
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/50691
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.title\$tring Theory and an Accelerating Universe
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