Some properties of the "String gas" with the equation of state $p=-\rho /3$

Abstract

We show that the string gas - a perfect fluid with the equation of state $p=-\frac{1}{3}\rho$ possesses rather interesing properties. In Friedmann universes its presence can can change the observable topology of the space; in the spherically symmetric spacetimes it produces rather bizzare geometries and in a way its influence on the rotation curves mimics the dark matter effects.

9 pages, 1 figure

References in corpus (3)

• Dynamics of dark energy
• Reconstructing Dark Energy
• Tolman-Oppenheimer-Volkoff equations in presence of the Chaplygin gas: stars and wormhole-like solutions

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