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Article: Anisotropy in Bianchitype brane cosmologies
Title  Anisotropy in Bianchitype brane cosmologies 

Authors  
Issue Date  2004 
Publisher  Institute of Physics Publishing. The Journal's web site is located at http://www.iop.org/EJ/cqg 
Citation  Classical and Quantum Gravity, 2004, v. 21 n. 6, p. 14891503 How to Cite? 
Abstract  The behaviour near the initial state of the anisotropy parameter of the arbitrary type, homogeneous and anisotropic Blanchi models is considered in the framework of the braneworld cosmological models. The matter content on the brane is assumed to be an isotropic perfect cosmological fluid obeying a barotropic equation of state. To obtain the value of the anisotropy parameter at an arbitrary moment an evolution equation is derived, describing the dynamics of the anisotropy as a function of the volume scale factor of the universe. The general solution of this equation can be obtained in an exact analytical form for the Bianchi I and V types and in a closed form for all other homogeneous and anisotropic geometries. The study of the values of the anisotropy in the limit of small times shows that for all Bianchitype spacetimes filled with a nonzero pressure cosmological fluid, obeying a linear barotropic equation of state, the initial singular state on the brane is isotropic. This result is obtained by assuming that in the limit of small times the asymptotic behaviour of the scale factors is of Kasnertype. For braneworlds filled with dust, the initial values of the anisotropy coincide in both braneworld and standard fourdimensional general relativistic cosmologies. 
Persistent Identifier  http://hdl.handle.net/10722/91791 
ISSN  2017 Impact Factor: 3.283 2015 SCImago Journal Rankings: 1.633 
References 
DC Field  Value  Language 

dc.contributor.author  Harko, T  en_HK 
dc.contributor.author  Mak, MK  en_HK 
dc.date.accessioned  20100917T10:26:44Z   
dc.date.available  20100917T10:26:44Z   
dc.date.issued  2004  en_HK 
dc.identifier.citation  Classical and Quantum Gravity, 2004, v. 21 n. 6, p. 14891503  en_HK 
dc.identifier.issn  02649381  en_HK 
dc.identifier.uri  http://hdl.handle.net/10722/91791   
dc.description.abstract  The behaviour near the initial state of the anisotropy parameter of the arbitrary type, homogeneous and anisotropic Blanchi models is considered in the framework of the braneworld cosmological models. The matter content on the brane is assumed to be an isotropic perfect cosmological fluid obeying a barotropic equation of state. To obtain the value of the anisotropy parameter at an arbitrary moment an evolution equation is derived, describing the dynamics of the anisotropy as a function of the volume scale factor of the universe. The general solution of this equation can be obtained in an exact analytical form for the Bianchi I and V types and in a closed form for all other homogeneous and anisotropic geometries. The study of the values of the anisotropy in the limit of small times shows that for all Bianchitype spacetimes filled with a nonzero pressure cosmological fluid, obeying a linear barotropic equation of state, the initial singular state on the brane is isotropic. This result is obtained by assuming that in the limit of small times the asymptotic behaviour of the scale factors is of Kasnertype. For braneworlds filled with dust, the initial values of the anisotropy coincide in both braneworld and standard fourdimensional general relativistic cosmologies.  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/cqg  en_HK 
dc.relation.ispartof  Classical and Quantum Gravity  en_HK 
dc.title  Anisotropy in Bianchitype brane cosmologies  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.doi  10.1088/02649381/21/6/015   
dc.identifier.scopus  eid_2s2.01842479955  en_HK 
dc.identifier.hkuros  90086   
dc.relation.references  http://www.scopus.com/mlt/select.url?eid=2s2.01842479955&selection=ref&src=s&origin=recordpage  en_HK 
dc.identifier.volume  21  en_HK 
dc.identifier.issue  6  en_HK 
dc.identifier.spage  1489  en_HK 
dc.identifier.epage  1503  en_HK 