Route to nonlocal cosmology

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dc.creatorCalcagni, Gianluca
dc.creatorMontobbio, Michele
dc.creatorNardelli, Giuseppe
dc.date2007-05-21
dc.date2007-12-10
dc.date.accessioned2026-07-07T10:55:44Z
dc.date.available2026-07-07T10:55:44Z
dc.descriptionAn analytic approach to phenomenological models inspired by cubic string field theory is introduced and applied to some examples. We study a class of actions for a minimally coupled, homogeneous scalar field whose energy density contains infinitely many time derivatives. These nonlocal systems are systematically localized and an algorithm to find cosmological solutions of the dynamical equations is provided. Our formalism is able to define the nonlocal field in regions of the parameter space which are inaccessible by standard methods. Also, problems related to nonlocality are reinterpreted under a novel perspective and naturally overcome. We consider phenomenological models living on a Friedmann-Robertson-Walker background with power-law scale factor, both in four dimensions and on a high-energy braneworld. The quest for solutions unravels general features of nonlocal dynamics indicating several future directions of investigation.
dc.description20 pages, 3 figures. v2: references addded, typos corrected, discussion improved; v3: matches the published version
dc.identifierhttps://arxiv.org/abs/0705.3043
dc.identifierhttp://arxiv.org/abs/0705.3043
dc.identifierPhys.Rev.D76:126001,2007
dc.identifierdoi:10.1103/PhysRevD.76.126001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186177
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleRoute to nonlocal cosmology
dc.typetext

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