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Article: Reheating the Universe in braneworld cosmological models with bulk-brane energy transfer

TitleReheating the Universe in braneworld cosmological models with bulk-brane energy transfer
Authors
KeywordsCosmological applications of theories with extra dimensions
Cosmology of theories beyond the SM
Cosmology with extra dimensions
Physics of the early universe
Issue Date2008
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAP
Citation
Journal Of Cosmology And Astroparticle Physics, 2008, v. 2008 n. 6 How to Cite?
AbstractThe emergence of the cosmological composition (the reheating era) after the inflationary period is analyzed in the framework of the braneworld models, in which our Universe is a 3-brane embedded in a five-dimensional bulk, by assuming the possibility of brane-bulk energy exchange. The inflaton field is assumed to decay into normal matter only, while the dark matter is injected into the brane from the bulk. To describe the reheating process we adopt a phenomenological approach, by describing the decay of the inflaton field using a friction term proportional to the energy density of the field. After the radiation dominated epoch the model reduces to the standard four-dimensional cosmological model. The modified field equations are analyzed analytically and numerically in both the extra-dimension dominated reheating phase (when the quadratic terms in energy density dominate the dynamics) and the general case. The evolution profiles of the matter, of the scalar field and of the scale factor of the Universe are obtained for different values of the parameters of the model and of the equations of state of the normal and dark matter. The equation describing the time evolution of the ratio of the energy densities of the dark and the normal matter is also obtained. The ratio depends on the rate of energy flow between the bulk and the brane. The observational constraint of an approximately constant ratio of the dark and the baryonic matter requires that the dark matter must be non-relativistic (cold). The model predicts a reheating temperature of the order of 3 × 10 6GeV, a brane tension of the order of 10 25GeV 4, and the composition of the Universe obtained is consistent with the observational data. © 2008 IOP Publishing Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/91789
ISSN
2015 Impact Factor: 5.634
2015 SCImago Journal Rankings: 0.652
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHarko, Ten_HK
dc.contributor.authorChoi, WFen_HK
dc.contributor.authorWong, KCen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-17T10:26:40Z-
dc.date.available2010-09-17T10:26:40Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Cosmology And Astroparticle Physics, 2008, v. 2008 n. 6en_HK
dc.identifier.issn1475-7516en_HK
dc.identifier.urihttp://hdl.handle.net/10722/91789-
dc.description.abstractThe emergence of the cosmological composition (the reheating era) after the inflationary period is analyzed in the framework of the braneworld models, in which our Universe is a 3-brane embedded in a five-dimensional bulk, by assuming the possibility of brane-bulk energy exchange. The inflaton field is assumed to decay into normal matter only, while the dark matter is injected into the brane from the bulk. To describe the reheating process we adopt a phenomenological approach, by describing the decay of the inflaton field using a friction term proportional to the energy density of the field. After the radiation dominated epoch the model reduces to the standard four-dimensional cosmological model. The modified field equations are analyzed analytically and numerically in both the extra-dimension dominated reheating phase (when the quadratic terms in energy density dominate the dynamics) and the general case. The evolution profiles of the matter, of the scalar field and of the scale factor of the Universe are obtained for different values of the parameters of the model and of the equations of state of the normal and dark matter. The equation describing the time evolution of the ratio of the energy densities of the dark and the normal matter is also obtained. The ratio depends on the rate of energy flow between the bulk and the brane. The observational constraint of an approximately constant ratio of the dark and the baryonic matter requires that the dark matter must be non-relativistic (cold). The model predicts a reheating temperature of the order of 3 × 10 6GeV, a brane tension of the order of 10 25GeV 4, and the composition of the Universe obtained is consistent with the observational data. © 2008 IOP Publishing Ltd.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAPen_HK
dc.relation.ispartofJournal of Cosmology and Astroparticle Physicsen_HK
dc.subjectCosmological applications of theories with extra dimensionsen_HK
dc.subjectCosmology of theories beyond the SMen_HK
dc.subjectCosmology with extra dimensionsen_HK
dc.subjectPhysics of the early universeen_HK
dc.titleReheating the Universe in braneworld cosmological models with bulk-brane energy transferen_HK
dc.typeArticleen_HK
dc.identifier.emailHarko, T: harko@hkucc.hku.hken_HK
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityHarko, T=rp01333en_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1475-7516/2008/06/002en_HK
dc.identifier.scopuseid_2-s2.0-47249132854en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-47249132854&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume2008en_HK
dc.identifier.issue6en_HK
dc.identifier.isiWOS:000257339800032-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHarko, T=7006485783en_HK
dc.identifier.scopusauthoridChoi, WF=36641789300en_HK
dc.identifier.scopusauthoridWong, KC=36085523500en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.citeulike2858303-

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