The exterior field of slowly and rapidly rotating neutron stars: Rehabilitating spacetime metrics involving hyperextreme objects
arXiv:1603.08054 · doi:10.1103/PhysRevD.93.104051
Abstract
The 4-parameter exact solution presumably describing the exterior gravitational field of a generic neutron star is presented in a concise explicit form defined by only three potentials. In the equatorial plane, the metric functions of the solution are found to be given by particularly simple expressions that make them very suitable for the use in concrete applications. Following Pappas and Apostolatos, we perform a comparison of the multipole structure of the solution with the multipole moments of the known physically realistic Berti-Stergioulas numerical models of neutron stars to argue that the hyperextreme sectors of the solution are not less (but possibly even more) important for the correct description of rapidly rotating neutron stars than the subextreme sector involving exclusively the black-hole constituents. We have also worked out in explicit form an exact analog of the well-known Hartle-Thorne approximate metric.
14 pages, 1 figure
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Cited by in corpus (8)
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- Rotating Stars in Relativity
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- An accurate metric for the spacetime around neutron stars
- Calculation of multipole moments of axistationary electrovacuum spacetimes
- Metric for two equal Kerr black holes
- On the simplest static and stationary vacuum quadrupolar metrics
- Testing exterior spacetime of the neutron star via X-ray reflection spectroscopy