Source: http://rgs.vniims.ru/abs/abs-15-345.html
Timestamp: 2019-04-23 02:46:15+00:00

Document:
We study the effective spacetimes in lower dimensions that can be extracted from a multidimensional generalization of the Schwarzschild-Tangherlini spacetimes derived by Fadeev, Ivashchuk and Melnikov (Phys. Lett. A 161, 98 (1991)). The higher-dimensional spacetime has D = (4 + n + m) dimensions, where n and m are the number of ïnternal" and ëxternal" extra dimensions, respectively. We analyze the effective (4 + n) spacetime obtained after dimensional reduction of the m external dimensions. We find that when the m extra dimensions are compact (i) the physics in lower dimensions is independent of m and the character of singularities in higher dimensions, and (ii) the total gravitational mass M of the effective matter distribution is less than the Schwarzschild mass. In contrast, when the m extra dimensions are large, this is not so; the physics in (4 + n) does explicitly depend on m as well as on the nature of singularities in high dimensions, and the mass of the effective matter distribution (with the exception of wormhole-like distributions) is larger than the Schwarzschild mass. These results may be relevant to observations for an experimental/observational test of the theory.
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