Eur. Phys. J. C (2011) 71: 1638
https://doi.org/10.1140/epjc/s10052-011-1638-x

Regular Article - Theoretical Physics

Stars in five-dimensional Kaluza–Klein gravity

¹ Dipartimento di Fisica, Universita’ di Rome, “Sapienza”, Piazzale Aldo Moro 5, 00185, Rome, Italy
² School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London, E1 4NS, UK
³ ENEA-C. R. Frascati U.T. Fus. (Fus. Mag. Lab.), via E. Fermi 45, 00044, Frascati, Rome, Italy

^* e-mail: giovanni.montani@frascati.enea.it

Received: 23 September 2010
Revised: 3 April 2011
Published online: 13 May 2011

Abstract

In the five-dimensional Kaluza–Klein (KK) theory there is a well known class of static and electromagnetic-free KK-equations characterized by a naked singularity behavior, namely the Generalized Schwarzschild solution (GSS). We present here a set of interior solutions of five-dimensional KK-equations. These equations have been numerically integrated to match the GSS in the vacuum. The solutions are candidates to describe the possible interior perfect fluid source of the exterior GSS metric and thus they can be models for stars for static, neutral astrophysical objects in the ordinary (four-dimensional) spacetime.