Physical properties of an exact spherically symmetric solution with shear in general relativity

Details Physical properties of an exact spherically symmetric solution with shear in general relativity Physical properties of an exact spherically symmetric solution with shear in general relativity

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gregr..24.1297k&link_type=abstract

General Relativity and Gravitation, Volume 24, Issue 12, pp.1297-1313

Computer Science

Sound

7

Scientific paper

The properties of an exact spherically symmetric perfect fluid solution obtained in non-comoving coordinates are examined. This solution contains shear, and the pressure and the density are positive in the interior of the fluid. Their respective gradients with respect to comoving radial coordinate are equal and negative, and the speed of sound in this fluid is less than the speed of light in vacuum and is increasing outwards. There is a singularity at the center of the fluid since the pressure and the density become infinite there, though their ratio becomes unity. This singularity is naked, since there does not exist a trapped surface in the fluid outside this singularity. The circumference is an increasing function of radical comoving coordinate, and the mass function is positive and is increasing outwards. There are no tidal forces in radial direction, but the tidal forces normal to this direction are non-vanishing. We also give the kinematic quantities for this fluid. However, it is not possible to match this solution with an exterior vacuum Schwarzschild solution. Moreover, the dominant energy condition produces imaginary values for the sound speed.

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