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dc.contributor.authorZhao, Hongsheng
dc.contributor.authorPeacock, John
dc.contributor.authorLi, Baojiu
dc.identifier.citationZhao , H , Peacock , J & Li , B 2013 , ' Testing gravity theories via transverse doppler and gravitational redshifts in galaxy clusters ' , Physical review. D, Particles, fields, gravitation, and cosmology , vol. 88 , no. 4 , 043013 .
dc.identifier.otherPURE: 70762932
dc.identifier.otherPURE UUID: 664eba40-7c78-4fd3-b953-a79c748e6931
dc.identifier.otherScopus: 84884850484
dc.description.abstractThere is growing interest in testing alternative gravity theories using the subtle gravitational redshifts in clusters of galaxies. However, current models all neglect a transverse Doppler redshift of similar magnitude, and some models are not self-consistent. An equilibrium model would fix the gravitational and transverse Doppler velocity shifts to be about 6σ2/c and 3σ2/2c in order to fit the observed velocity dispersion σ self-consistently. This result comes from the Virial Theorem for a spherical isotropic cluster, and is insensitive to the theory of gravity. A gravitational redshift signal also does not directly distinguish between the Einsteinian and ƒ(R) gravity theories, because each theory requires different dark halo mass function to keep the clusters in equilibrium. When this constraint is imposed, the gravitational redshift has no sensitivity to theory. Indeed our N-body simulations show that the halo mass function differs in ƒ(R), and that the transverse Doppler effect is stronger than analytically predicted due to non-equilibrium.
dc.relation.ispartofPhysical review. D, Particles, fields, gravitation, and cosmologyen
dc.rights© 2013 American Physical Societyen
dc.subjectQB Astronomyen
dc.titleTesting gravity theories via transverse doppler and gravitational redshifts in galaxy clustersen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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