A Principle to Determine the Number (3 + 1) of Large Spacetime Dimensions
Oct, 200611 pages
Published in:
- Phys.Lett.B 645 (2007) 365-368
e-Print:
- hep-th/0610071 [hep-th]
Report number:
- IMSC-2006-10-22
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Abstract:
We assume that our universe originated from highly excited and interacting strings with coupling constant g_s = {\cal O} (1). Fluctuations of spacetime geometry are large in such strings and the physics dictating the emergence of a final spacetime configuration is not known. We propose that, nevertheless, it is determined by an entropic principle that the final spacetime configuration must have maximum entropy for a given amount of energy. This principle implies, under some assumptions, that the spacetime configuration that emerges finally is a (3 + 1) -- dimensional FRW universe filled with w = 1 perfect fluid and with 6 -- dimensional compact space of size l_s: in particular, the number of large spacetime dimensions is d = 3 + 1. Such an universe may evolve subsequently into our universe, perhaps as in Banks -- Fischler scenario.- cosmological model
- string: interaction
- string model
- supersymmetry
- dimension: 10
- entropy
- space-time: Robertson-Walker
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