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Self-gravitating fluid systems and galactic dark matter.
- Source :
-
General Relativity & Gravitation . Sep2017, Vol. 49 Issue 9, p1-21. 21p. - Publication Year :
- 2017
-
Abstract
- We study gravitational collapse with anisotropic pressures, whose end stage can mimic space-times that are seeded by galactic dark matter. To this end, we identify a class of space-times (with conical defects) that can arise out of such a collapse process, and admit stable circular orbits at all radial distances. These have a naked singularity at the origin. An example of such a space-time is seen to be the Bertrand space-time discovered by Perlick, that admits closed, stable orbits at all radii. Using relativistic two-fluid models, we show that our galactic space-times might indicate exotic matter, i.e one of the component fluids may have negative pressure for a certain asymptotic fall off of the associated mass density, in the Newtonian limit. We complement this analysis by studying some simple examples of Newtonian two-fluid systems, and compare this with the Newtonian limit of the relativistic systems considered. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00017701
- Volume :
- 49
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- General Relativity & Gravitation
- Publication Type :
- Academic Journal
- Accession number :
- 125294266
- Full Text :
- https://doi.org/10.1007/s10714-017-2284-x