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Article: Rotational perturbations of high density matter in the brane cosmology
Title  Rotational perturbations of high density matter in the brane cosmology 

Authors  
Keywords  Cosmological Perturbation Theory Cosmology With Extra Dimensions Extra Dimensions 
Issue Date  2003 
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, 2003 n. 11, p. 5978 How to Cite? 
Abstract  We consider the evolution of small rotational perturbations, with azimuthal symmetry, of the braneworld cosmological models. The equations describing the temporal, radial and angular dependence of the perturbations are derived by taking into account the effects of both scalar and tensor parts of the dark energy term on the brane. The time decay of the initial rotation is investigated for several types of equation of state of the ultrahigh density cosmological matter. For an expanding Universe, rotation always decays in the case of the perfect dragging, for which the angular velocity of the matter on the brane equals the rotation metric tensor. For nonperfect dragging, the behaviour of the rotation is strongly equation of state dependent. For some classes of dense matter, like the stiff causal or the Chaplygin gas, the angular velocity of the matter on the brane is an increasing function of time. For other types of the ultradense matter, such as the Hagedorn fluid, rotation is smoothed out by the expansion of the Universe. Therefore the study of dynamics of rotational perturbations of braneworld models, as well as in general relativity, could provide some insights on the physical properties and equation of state of the cosmological fluid filling the very early Universe. " 2003 IOP Publishing Ltd. 
Persistent Identifier  http://hdl.handle.net/10722/91779 
ISSN  2015 Impact Factor: 5.634 2015 SCImago Journal Rankings: 0.652 
References 
DC Field  Value  Language 

dc.contributor.author  Chen, CM  en_HK 
dc.contributor.author  Harko, T  en_HK 
dc.contributor.author  Kao, WF  en_HK 
dc.contributor.author  Mak, MK  en_HK 
dc.date.accessioned  20100917T10:26:22Z   
dc.date.available  20100917T10:26:22Z   
dc.date.issued  2003  en_HK 
dc.identifier.citation  Journal of Cosmology and Astroparticle Physics, 2003 n. 11, p. 5978  en_HK 
dc.identifier.issn  14757516  en_HK 
dc.identifier.uri  http://hdl.handle.net/10722/91779   
dc.description.abstract  We consider the evolution of small rotational perturbations, with azimuthal symmetry, of the braneworld cosmological models. The equations describing the temporal, radial and angular dependence of the perturbations are derived by taking into account the effects of both scalar and tensor parts of the dark energy term on the brane. The time decay of the initial rotation is investigated for several types of equation of state of the ultrahigh density cosmological matter. For an expanding Universe, rotation always decays in the case of the perfect dragging, for which the angular velocity of the matter on the brane equals the rotation metric tensor. For nonperfect dragging, the behaviour of the rotation is strongly equation of state dependent. For some classes of dense matter, like the stiff causal or the Chaplygin gas, the angular velocity of the matter on the brane is an increasing function of time. For other types of the ultradense matter, such as the Hagedorn fluid, rotation is smoothed out by the expansion of the Universe. Therefore the study of dynamics of rotational perturbations of braneworld models, as well as in general relativity, could provide some insights on the physical properties and equation of state of the cosmological fluid filling the very early Universe. " 2003 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 Perturbation Theory  en_HK 
dc.subject  Cosmology With Extra Dimensions  en_HK 
dc.subject  Extra Dimensions  en_HK 
dc.title  Rotational perturbations of high density matter in the brane cosmology  en_HK 
dc.type  Article  en_HK 
dc.identifier.email  Harko, TC:harko@hkucc.hku.hk  en_HK 
dc.identifier.authority  Harko, TC=rp1333  en_HK 
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.scopus  eid_2s2.023244463606  en_HK 
dc.relation.references  http://www.scopus.com/mlt/select.url?eid=2s2.023244463606&selection=ref&src=s&origin=recordpage  en_HK 
dc.identifier.issue  11  en_HK 
dc.identifier.spage  59  en_HK 
dc.identifier.epage  78  en_HK 