Observational constraints on accelerating brane cosmology with exchange between the bulk and brane

K. Umezu, K. Ichiki, T. Kajino, G. J. Mathews, R. Nakamura, M. Yahiro

Research output: Contribution to journalArticle

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Abstract

We explore observational constraints on a cosmological brane world scenario in which the bulk is not empty. Rather, exchange of mass energy between the bulk and the brane is allowed. The evolution of matter fields to an observer on the brane is then modified due to new terms in the energy-momentum tensor describing this exchange. We investigate the constraints from various cosmological observations on the flow of matter from the bulk into the brane. Interestingly, we show that it is possible to have a Λ=0 cosmology to an observer in the brane which satisfies standard cosmological constraints including the cosmic microwave background (CMB) temperature fluctuations, Type Ia supernovae at high redshift, and the matter power spectrum. This model even accounts for the observed suppression of the CMB power spectrum at low multipoles. In this cosmology, the observed cosmic acceleration is attributable to the flow of matter from the bulk to the brane. A peculiar aspect of this cosmology is that the present dark-matter content of the Universe may be significantly larger than that of a ΛCDM cosmology. Its influence, however, is offset by the dark-radiation term. Possible additional observational tests of this new cosmological paradigm are suggested.

Original languageEnglish
Article number063527
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume73
Issue number6
DOIs
Publication statusPublished - Apr 7 2006

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cosmology
power spectra
microwaves
multipoles
supernovae
dark matter
universe
kinetic energy
retarding
tensors
radiation
temperature
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Observational constraints on accelerating brane cosmology with exchange between the bulk and brane. / Umezu, K.; Ichiki, K.; Kajino, T.; Mathews, G. J.; Nakamura, R.; Yahiro, M.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 73, No. 6, 063527, 07.04.2006.

Research output: Contribution to journalArticle

Umezu, K. ; Ichiki, K. ; Kajino, T. ; Mathews, G. J. ; Nakamura, R. ; Yahiro, M. / Observational constraints on accelerating brane cosmology with exchange between the bulk and brane. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2006 ; Vol. 73, No. 6.
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