Brane Formation and Cosmological Constraint on the Number of Extra Dimensions |
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Authors: | Email author" target="_blank">Feng?LuoEmail author Hongya?Liu |
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Institution: | (1) Department of Physics, Dalian University of Technology, Dalian, 116024, Peoples' Republic of China |
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Abstract: | 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 ≥ 7. |
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Keywords: | extra dimensions special relativity brane |
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