Publication:
The Raychaudhuri equation in homogeneous cosmologies

dc.contributor.authorAlbareti, F. D.
dc.contributor.authorRuiz Cembranos, José Alberto
dc.contributor.authorCruz Dombriz, Álvaro de la
dc.contributor.authorDobado González, Antonio
dc.date.accessioned2023-06-19T14:59:20Z
dc.date.available2023-06-19T14:59:20Z
dc.date.issued2014
dc.description© 2014 IOP Publishing Ltd and Sissa Medialab srl. This work has been supported by MICINN (Spain) projects numbers FIS2011-23000, FPA2011-27853-C02-01, FPA2011-27853-C02-01, UCM-BSCH GR58/08 910309 and Consolider-Ingenio MULTIDARK CSD2009-00064. F.D.A. acknowledges financial support from the UAM+CSIC Campus of International Excellence (Spain). A.d.l.C.D. thanks the financial support from ACGC University of Cape Town and IEEC-ICE Barcelona in 2013 as well as the hospitality of Kavli Institute for Theoretical Physics China (KITPC) during the preparation of this manuscript.
dc.description.abstractIn this work we address the issue of studying the conditions required to guarantee the Focusing Theorem for both null and time like geodesic congruences by using the Raychaudhuri equation. In particular we study the case of Friedmann-Robertson-Walker as well as more general Bianchi Type I spacetimes. The fulfillment of the Focusing Theorem is mandatory in small scales since it accounts for the attractive character of gravity. However, the Focusing Theorem is not satisfied at cosmological scales due to the measured negative deceleration parameter. The study of the conditions needed for congruences convergence is not only relevant at the fundamental level but also to derive the viability conditions to be imposed on extended theories of gravity describing the different expansion regimes of the universe. We illustrate this idea for f (R) gravity theories.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (MICINN), España
dc.description.sponsorshipActividad Investigadora CONSOLIDER - INGENIO - MULTIDARK (MICINN)
dc.description.sponsorshipCampus de Excelencia Internacional (CEI) UAM-CSIC
dc.description.sponsorshipACGC University of Cape Town
dc.description.sponsorshipIEEC-ICE Barcelona
dc.description.sponsorshipUniversidad Autónoma de Madrid (UAM)
dc.description.sponsorshipConsejo Superior de Investigaciones Científicas (CSIC), España
dc.description.sponsorshipInstitut d'Estudis Espacials de Catalunya (IEEC)
dc.description.sponsorshipInstituto de Ciencias del Espacio (ICE)
dc.description.sponsorshipUniversidad Complutense de Madrid (UCM)
dc.description.sponsorshipBanco Santander Central Hispano (BSCH)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/35715
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dc.identifier.doi10.1088/1475-7516/2014/03/012
dc.identifier.issn1475-7516
dc.identifier.officialurlhttp://dx.doi.org/10.1088/1475-7516/2014/03/012
dc.identifier.relatedurlhttp://iopscience.iop.org/
dc.identifier.relatedurlhttp://arxiv.org/abs/1401.7926
dc.identifier.urihttps://hdl.handle.net/20.500.14352/35052
dc.journal.titleJournal of cosmology and astroparticle physics
dc.language.isoeng
dc.publisherIop Publishing
dc.relation.projectIDFIS2011-23000
dc.relation.projectIDFPA2011-27853-C02-01
dc.relation.projectIDGR58/08 910309
dc.relation.projectIDCSD2009-00064
dc.rights.accessRightsopen access
dc.subject.cdu53
dc.subject.keywordR-n-gravity
dc.subject.keywordDark energy
dc.subject.keywordRelativistic theory
dc.subject.keywordMachs principle
dc.subject.keywordCpt violation
dc.subject.keywordSupergravity
dc.subject.keywordSupersymmetry
dc.subject.keywordSupernovae
dc.subject.keywordConstant
dc.subject.keywordGeometry
dc.subject.ucmFísica (Física)
dc.subject.unesco22 Física
dc.titleThe Raychaudhuri equation in homogeneous cosmologies
dc.typejournal article
dc.volume.number3
dspace.entity.typePublication
relation.isAuthorOfPublicationc5a4cc87-ceba-494d-95ab-d54b9b1a35e3
relation.isAuthorOfPublication16523fad-99a9-422c-9a8e-c949ccffadec
relation.isAuthorOfPublication.latestForDiscoveryc5a4cc87-ceba-494d-95ab-d54b9b1a35e3
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