Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-05-17
Physics
High Energy Physics
High Energy Physics - Theory
2 2 pages, Revtex, no figures. Some equations in section V have been corrected and, in correspondence, the discussion of the c
Scientific paper
A five-dimensional scenario with a non compact extra dimension of infinite extent is studied, in which a single three-brane is affected by small Gaussian fluctuations in the extra dimension. The average magnitude of the fluctuations is of order of the electro-weak length scale ($\sigma\sim m_{EW}^{-1}$). The model provides an stochastic approach to gravity that accounts for an alternative resolution of the mass hierarchy problem. The cosmological constant problem can be suitably treated as well. Surprisingly the Mach's principle finds a place in the model. It is argued that the Mach's principle, the mass hierarchy and the cosmological constant problem, are different aspects of a same property of gravity in this model: its stochastic character. Thin-brane scenarios are recovered in the "no-fluctuations" limit ($\sigma\to 0$).
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