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de Broglie–Bohm FRW universes in quantum string cosmology

dc.contributor.authorMarto, João
dc.contributor.authorMoniz, Paulo
dc.date.accessioned2018-11-26T11:47:02Z
dc.date.available2018-11-26T11:47:02Z
dc.date.issued2001
dc.description.abstractThe purpose of this paper is to establish possible implications of the de Broglie–Bohm interpretation of quantum mechanics towards superstring cosmological dynamics. In this context, we investigate spatially flat FRW models retrieved from scalar-tensor theories of gravity with a cosmological constant present in the gravitational sector. These models are further characterized by the presence of different types of de Broglie– Bohm quantum potential terms. These are constructed from various classes of wave packets formed by superpositions of Bessel functions of different imaginary orders. As far as pre-big-bang scenarios are concerned, we find that quantum potentials yield varied types of an amplified influence of the singular classical boundary into the FRW early dynamics. Some consequences of the de Broglie–Bohm program towards pre-big-bang inflation and the graceful exit problem are then discussed. Other cosmological scenarios are also studied by means of modulation effects extracted from additional wave packets. We subsequently obtain a broader set of new solutions. Among the new solutions we find that they could still be related by duality properties, although a separation into pre- and post-big-bang classes is less clear. Some solutions show a cyclical behavior. Inflationary solutions can be identified and some of their dynamical features are subsequently analyzed. In particular, we discuss some of the differences between string inspired inflationary cosmologies with quantum potentials. The results suggest that de Broglie–Bohm quantum gravitational terms slow down inflation, constituting an effect similar to others previously described in the literature.pt_PT
dc.description.sponsorshipThis research work was supported by grants ESO/PRO/ 1258/98, CERN/P/FIS/15190/1999 and POCTI/32327/P/FIS/ 2000 as well as by financial assistance from the Gulbenkian Foundation.
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1103/PhysRevD.65.023516pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.6/6489
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherAmerican Physical Societypt_PT
dc.relationQuantum Cosmological Implications of Superstring Theory
dc.relation.publisherversionhttps://doi.org/10.1103/PhysRevD.65.023516pt_PT
dc.subjectQuantum string cosmologypt_PT
dc.titlede Broglie–Bohm FRW universes in quantum string cosmologypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleQuantum Cosmological Implications of Superstring Theory
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POCI/POCTI%2FFIS%2F32327%2F2000/PT
oaire.citation.issue2pt_PT
oaire.citation.titlePhysical Review D - Particles, Fields, Gravitation and Cosmologypt_PT
oaire.citation.volume65pt_PT
oaire.fundingStreamPOCI
person.familyNamePedro de Jesus Marto
person.familyNameMoniz
person.givenNameJoão
person.givenNamePaulo
person.identifier277693
person.identifier.ciencia-id2F16-67B1-A930
person.identifier.ciencia-idB410-D0B7-55C1
person.identifier.orcid0000-0003-3974-9177
person.identifier.orcid0000-0001-7170-8952
person.identifier.ridM-9845-2013
person.identifier.scopus-author-id6701832578
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.embargofctCopyright cedido à editora no momento da publicaçãopt_PT
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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