On Observational Predictions from Multidimensional Gravity

Abstract

We discuss possible observational manifestations of static, spherically symmetric solutions of a class of multidimensional theories of gravity, which includes the low energy limits of supergravities and superstring theories as 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-Newtonian gravitational field of a central body, (ii) p-brane black hole temperatures in different conformal frames and (iii) the Coulomb law modified by extra 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 observations, 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.

16 pages, Latex2e

References in corpus (3)

• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Superradiance from a Charged Dilaton Black Hole
• String versus Einstein frame in an AdS/CFT induced quantum dilatonic brane-world universe

Cited by in corpus (10)

• Magneto-dilatonic Bianchi-I cosmology: isotropization and singularity problems
• Scalar-tensor gravity and conformal continuations
• The Effective Energy-Momentum Tensor in Kaluza-Klein Gravity With Large Extra Dimensions and Off-Diagonal Metrics
• Multidimensional world, inflation and modern acceleration
• Scalar fields in multidimensional gravity. No-hair and other no-go theorems
• Variations of $\alpha$ and $G$ from nonlinear multidimensional gravity
• On cosmology in nonlinear multidimensional gravity with multiple factor spaces
• Cosmologies from nonlinear multidimensional gravity with acceleration and slowly varying G
• Conformal frames and D-dimensional gravity
• Constraints on scalar coupling to electromagnetism