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Article: Cosmological evolution of finite temperature Bose-Einstein condensate dark matter

TitleCosmological evolution of finite temperature Bose-Einstein condensate dark matter
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D (Particles, Fields, Gravitation and Cosmology), 2012, v. 85 n. 8, article no. 084012 How to Cite?
AbstractOnce the temperature of a bosonic gas is smaller than the critical, density dependent, transition temperature, a Bose-Einstein condensation process can take place during the cosmological evolution of the Universe. Bose-Einstein condensates are very strong candidates for dark matter, since they can solve some major issues in observational astrophysics, like, for example, the galactic core/cusp problem. The presence of the dark matter condensates also drastically affects the cosmic history of the Universe. In the present paper we analyze the effects of the finite dark matter temperature on the cosmological evolution of the Bose-Einstein condensate dark matter systems. We formulate the basic equations describing the finite temperature condensate, representing a generalized Gross-Pitaevskii equation that takes into account the presence of the thermal cloud in thermodynamic equilibrium with the condensate. The temperature dependent equations of state of the thermal cloud and of the condensate are explicitly obtained in an analytical form. By assuming a flat Friedmann-Robertson-Walker geometry, the cosmological evolution of the finite temperature dark matter filled Universe is considered in detail in the framework of a two interacting fluid dark matter model, describing the transition from the initial thermal cloud to the low temperature condensate state. The dynamics of the cosmological parameters during the finite temperature dominated phase of the dark matter evolution are investigated in detail, and it is shown that the presence of the thermal excitations leads to an overall increase in the expansion rate of the Universe. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/149128
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
Funding AgencyGrant Number
RGC of the government of the Hong Kong SAR
Sectoral Operational Programme for Human Resources Development
European Social FundPOSDRU/107/1.5/S/76841
Funding Information:

T. H. is supported by an RGC grant of the government of the Hong Kong SAR. G. M. acknowledges the financial support of the Sectoral Operational Programme for Human Resources Development 2007-2013, cofinanced by the European Social Fund, under Project No. POSDRU/107/1.5/S/76841 with the title "Modern Doctoral Studies: Internationalization and Interdisciplinarity." G. M. would like to thank the Institute for Theoretical Physics, Vienna University of Technology, Austria, for their hospitality during the time when this work was drafted.

 

DC FieldValueLanguage
dc.contributor.authorHarko, TCen_US
dc.contributor.authorMocanu, Gen_US
dc.date.accessioned2012-06-22T06:24:54Z-
dc.date.available2012-06-22T06:24:54Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Review D (Particles, Fields, Gravitation and Cosmology), 2012, v. 85 n. 8, article no. 084012en_US
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/10722/149128-
dc.description.abstractOnce the temperature of a bosonic gas is smaller than the critical, density dependent, transition temperature, a Bose-Einstein condensation process can take place during the cosmological evolution of the Universe. Bose-Einstein condensates are very strong candidates for dark matter, since they can solve some major issues in observational astrophysics, like, for example, the galactic core/cusp problem. The presence of the dark matter condensates also drastically affects the cosmic history of the Universe. In the present paper we analyze the effects of the finite dark matter temperature on the cosmological evolution of the Bose-Einstein condensate dark matter systems. We formulate the basic equations describing the finite temperature condensate, representing a generalized Gross-Pitaevskii equation that takes into account the presence of the thermal cloud in thermodynamic equilibrium with the condensate. The temperature dependent equations of state of the thermal cloud and of the condensate are explicitly obtained in an analytical form. By assuming a flat Friedmann-Robertson-Walker geometry, the cosmological evolution of the finite temperature dark matter filled Universe is considered in detail in the framework of a two interacting fluid dark matter model, describing the transition from the initial thermal cloud to the low temperature condensate state. The dynamics of the cosmological parameters during the finite temperature dominated phase of the dark matter evolution are investigated in detail, and it is shown that the presence of the thermal excitations leads to an overall increase in the expansion rate of the Universe. © 2012 American Physical Society.-
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.orgen_US
dc.relation.ispartofPhysical Review D (Particles, Fields, Gravitation and Cosmology)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.titleCosmological evolution of finite temperature Bose-Einstein condensate dark matteren_US
dc.typeArticleen_US
dc.identifier.emailHarko, TC: harko@hkucc.hku.hken_US
dc.identifier.emailMocanu, G: gabriela.mocanu@ubbcluj.ro-
dc.identifier.authorityHarko, TC=rp01333en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevD.85.084012-
dc.identifier.scopuseid_2-s2.0-84860125888-
dc.identifier.hkuros199948en_US
dc.identifier.volume85en_US
dc.identifier.issue8, article no. 084012-
dc.identifier.isiWOS:000302698700002-
dc.publisher.placeUnited States-

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