The shape of multidimensional gravity

Details The shape of multidimensional gravity The shape of multidimensional gravity

2009-05-13

arxiv.org/abs/0905.2222v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages of Revtex4, 2 eps figures

Scientific paper

In the case of one extra dimension, well known Newton's potential $\phi (r_3)=-G_N m/r_3$ is generalized to compact and elegant formula $\phi(r_3,\xi)=-(G_N m/r_3)\sinh(2\pi r_3/a)[\cosh(2\pi r_3/a)-\cos(2\pi\xi/a)]^{-1}$ if four-dimensional space has topology $\mathbb{R}^3\times T$. Here, $r_3$ is magnitude of three-dimensional radius vector, $\xi$ is extra dimension and $a$ is a period of a torus $T$. This formula is valid for full range of variables $r_3 \in [0,+\infty)$ and $\xi\in [0,a]$ and has known asymptotic behavior: $\phi \sim 1/r_3$ for $r_3>>a$ and $\phi \sim 1/r_4^2$ for $r_4=\sqrt{r_3^2+\xi^2}<

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