Brane-world solutions, standard cosmology, and dark radiation

Details Brane-world solutions, standard cosmology, and dark radiation Brane-world solutions, standard cosmology, and dark radiation

1999-11-22

arxiv.org/abs/hep-th/9911165v3

Phys.Lett. B473 (2000) 241-245

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 5 pages; references are added, accepted for publication in Physics Letters B; references are added again

Scientific paper

10.1016/S0370-2693(99)01505-1

New exact solutions of brane-world cosmology are given. These solutions include an arbitrary constant C, which is determined by the geometry outside the brane and which affects the cosmological evolution in the brane-world. If C is zero, then the standard cosmology governs the brane-world as a low-energy effective cosmological theory. However, if C is not zero, then even in low-energy the brane-world cosmology gives predictions different from the standard one. The difference can be understood as ``dark radiation'', which is not real radiation but alters cosmological evolutions.

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