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- Publisher Website: 10.1088/1475-7516/2008/06/002
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Article: Reheating the Universe in braneworld cosmological models with bulk-brane energy transfer
Title | Reheating the Universe in braneworld cosmological models with bulk-brane energy transfer |
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Authors | |
Keywords | Cosmological applications of theories with extra dimensions Cosmology of theories beyond the SM Cosmology with extra dimensions Physics of the early universe |
Issue Date | 2008 |
Publisher | Institute 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? |
Abstract | The 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 Identifier | http://hdl.handle.net/10722/91789 |
ISSN | 2015 Impact Factor: 5.634 2015 SCImago Journal Rankings: 0.652 |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
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dc.contributor.author | Harko, T | en_HK |
dc.contributor.author | Choi, WF | en_HK |
dc.contributor.author | Wong, KC | en_HK |
dc.contributor.author | Cheng, KS | en_HK |
dc.date.accessioned | 2010-09-17T10:26:40Z | - |
dc.date.available | 2010-09-17T10:26:40Z | - |
dc.date.issued | 2008 | en_HK |
dc.identifier.citation | Journal Of Cosmology And Astroparticle Physics, 2008, v. 2008 n. 6 | en_HK |
dc.identifier.issn | 1475-7516 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/91789 | - |
dc.description.abstract | The 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.language | eng | en_HK |
dc.publisher | Institute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/journal/JCAP | en_HK |
dc.relation.ispartof | Journal of Cosmology and Astroparticle Physics | en_HK |
dc.subject | Cosmological applications of theories with extra dimensions | en_HK |
dc.subject | Cosmology of theories beyond the SM | en_HK |
dc.subject | Cosmology with extra dimensions | en_HK |
dc.subject | Physics of the early universe | en_HK |
dc.title | Reheating the Universe in braneworld cosmological models with bulk-brane energy transfer | en_HK |
dc.type | Article | en_HK |
dc.identifier.email | Harko, T: harko@hkucc.hku.hk | en_HK |
dc.identifier.email | Cheng, KS: hrspksc@hkucc.hku.hk | en_HK |
dc.identifier.authority | Harko, T=rp01333 | en_HK |
dc.identifier.authority | Cheng, KS=rp00675 | en_HK |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1088/1475-7516/2008/06/002 | en_HK |
dc.identifier.scopus | eid_2-s2.0-47249132854 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-47249132854&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 2008 | en_HK |
dc.identifier.issue | 6 | en_HK |
dc.identifier.isi | WOS:000257339800032 | - |
dc.publisher.place | United Kingdom | en_HK |
dc.identifier.scopusauthorid | Harko, T=7006485783 | en_HK |
dc.identifier.scopusauthorid | Choi, WF=36641789300 | en_HK |
dc.identifier.scopusauthorid | Wong, KC=36085523500 | en_HK |
dc.identifier.scopusauthorid | Cheng, KS=9745798500 | en_HK |
dc.identifier.citeulike | 2858303 | - |