Are braneworlds born isotropic?

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dc.contributor.authorDunsby, Peter K S
dc.contributor.authorGoheer, Naureen
dc.contributor.authorBruni, Marco
dc.contributor.authorColey, Alan
dc.date.accessioned2021-10-08T07:11:30Z
dc.date.available2021-10-08T07:11:30Z
dc.date.issued2004
dc.description.abstractIt has recently been suggested that an isotropic singularity may be a generic feature of brane cosmologies, even in the inhomogeneous case. Using the covariant and gauge-invariant approach we present a detailed analysis of linear perturbations of the isotropic model ${cal F}_b$ which is a past attractor in the phase space of homogeneous Bianchi models on the brane. We find that for matter with an equation of state parameter $gamma > 1$, the dimensionless variables representing generic anisotropic and inhomogeneous perturbations decay as $tto 0$, showing that the model ${cal F}_b$ is asymptotically stable in the past. We conclude that brane universes are born with isotropy naturally built-in, contrary to standard cosmology. The observed large-scale homogeneity and isotropy of the universe can therefore be explained as a consequence of the initial conditions if the brane-world paradigm represents a description of the very early universe. Comment: Changed to match published version
dc.identifier.apacitationDunsby, P. K. S., Goheer, N., Bruni, M., & Coley, A. (2004). Are braneworlds born isotropic?. <i>Physical Review D - Particles and Fields</i>, 69(10), 174 - 177. http://hdl.handle.net/11427/34626en_ZA
dc.identifier.chicagocitationDunsby, Peter K S, Naureen Goheer, Marco Bruni, and Alan Coley "Are braneworlds born isotropic?." <i>Physical Review D - Particles and Fields</i> 69, 10. (2004): 174 - 177. http://hdl.handle.net/11427/34626en_ZA
dc.identifier.citationDunsby, P.K.S., Goheer, N., Bruni, M. & Coley, A. 2004. Are braneworlds born isotropic?. <i>Physical Review D - Particles and Fields.</i> 69(10):174 - 177. http://hdl.handle.net/11427/34626en_ZA
dc.identifier.issn0556-2821
dc.identifier.issn1089-4918
dc.identifier.ris TY - Journal Article AU - Dunsby, Peter K S AU - Goheer, Naureen AU - Bruni, Marco AU - Coley, Alan AB - It has recently been suggested that an isotropic singularity may be a generic feature of brane cosmologies, even in the inhomogeneous case. Using the covariant and gauge-invariant approach we present a detailed analysis of linear perturbations of the isotropic model ${cal F}_b$ which is a past attractor in the phase space of homogeneous Bianchi models on the brane. We find that for matter with an equation of state parameter $gamma > 1$, the dimensionless variables representing generic anisotropic and inhomogeneous perturbations decay as $tto 0$, showing that the model ${cal F}_b$ is asymptotically stable in the past. We conclude that brane universes are born with isotropy naturally built-in, contrary to standard cosmology. The observed large-scale homogeneity and isotropy of the universe can therefore be explained as a consequence of the initial conditions if the brane-world paradigm represents a description of the very early universe. Comment: Changed to match published version DA - 2004 DB - OpenUCT DP - University of Cape Town IS - 10 J1 - Physical Review D - Particles and Fields LK - https://open.uct.ac.za PY - 2004 SM - 0556-2821 SM - 1089-4918 T1 - Are braneworlds born isotropic? TI - Are braneworlds born isotropic? UR - http://hdl.handle.net/11427/34626 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34626
dc.identifier.vancouvercitationDunsby PKS, Goheer N, Bruni M, Coley A. Are braneworlds born isotropic?. Physical Review D - Particles and Fields. 2004;69(10):174 - 177. http://hdl.handle.net/11427/34626.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourcePhysical Review D - Particles and Fields
dc.source.journalissue10
dc.source.journalvolume69
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1103/PhysRevD.69.101303
dc.subject.otherHigh Energy Physics - Theory
dc.subject.otherAstrophysics
dc.subject.otherGeneral Relativity and Quantum Cosmology
dc.titleAre braneworlds born isotropic?
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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