On observational predictions from multidimensional gravity

Citation
Ka. Bronnikov et Vn. Melnikov, On observational predictions from multidimensional gravity, GEN RELAT G, 33(9), 2001, pp. 1549-1578
Citations number
84
Categorie Soggetti
Physics
Journal title
GENERAL RELATIVITY AND GRAVITATION
ISSN journal
00017701 → ACNP
Volume
33
Issue
9
Year of publication
2001
Pages
1549 - 1578
Database
ISI
SICI code
0001-7701(200109)33:9<1549:OOPFMG>2.0.ZU;2-7
Abstract
We discuss possible observational manifestations of static, spherically sym metric solutions of a class of multidimensional theories of gravity, which includes the low energy limits of supergravities and superstring theories a s special cases. We discuss the choice of a physical conformal frame to be used for the description of observations. General expressions are given for (i) the Eddington parameters beta and gamma, characterizing the post-Newto nian gravitational field of a central body, (ii) p-brane black hole tempera tures in different conformal frames and (iii) the Coulomb law modified by e xtra dimensions. It is concluded, in particular, that beta and gamma depend on the integration constants and can be therefore different for different central bodies. If, however, the Einstein frame is adopted for describing o bservations, we always obtain gamma = 1. The modified Coulomb law is shown to be independent of the choice of a 4-dimensional conformal frame. We also argue the possible existence of specific multidimensional objects, T-holes , potentially observable as bodies with mirror surfaces.