Brane Formation and Cosmological Constraint on the Number of Extra Dimensions

Details Brane Formation and Cosmological Constraint on the Number of Extra Dimensions Brane Formation and Cosmological Constraint on the Number of Extra Dimensions

2005-03-30

arxiv.org/abs/gr-qc/0503115v1

Int.J.Theor.Phys. 44 (2005) 1441-1450

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, no figures. To appear in IJTP

Scientific paper

10.1007/s10773-005-4778-2

Special relativity is generalized to extra dimensions and quantized energy levels of particles are obtained. By calculating the probability of particles' motion in extra dimensions at high temperature of the early universe, it is proposed that the branes may have not existed since the very beginning of the universe, but formed later. Meanwhile, before the formation, particles of the universe may have filled in the whole bulk, not just on the branes. This scenario differs from that in the standard big bang cosmology in which all particles are assumed to be in the 4D spacetime. So, in brane models, whether our universe began from a 4D big bang singularity is questionable. A cosmological constraint on the number of extra dimensions is also given which favors $N\geq 7$.

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