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  Space-time modes of relativistic stars

Andersson, N., Kokkotas, K. D., & Schutz, B. F. (1996). Space-time modes of relativistic stars. Monthly Notices of the Royal Astronomical Society, 280(4), 1230-1234.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-1086-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-1089-9
Genre: Journal Article

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60225.pdf (Publisher version), 820KB
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 Creators:
Andersson, Nils1, Author
Kokkotas, Kostas D.1, Author
Schutz, Bernard F.1, 2, Author              
Affiliations:
1External Organizations, Department of Physics and Astronomy, University of Wales College of Cardiff, Cardiff CF2 3YB, UK, escidoc:persistent22              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, escidoc:24013              

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 Abstract: The problem of relativistic stellar pulsations is studied in a somewhat ad hoc approximation that ignores all fluid motions. This Inverse Cowling Approximation (ICA) is motivated by two observations. (1) For highly damped (w-mode) oscillations the fluid plays very little role. (2) If the fluid motion is neglected, the problem for polar oscillations modes becomes similar to that for axial modes. Using the ICA, we find a polar mode spectrum that has all features of the w-mode spectrum of the full problem. Moreover, in the limit of superdense stars, we find the ICA spectrum to be qualitatively similar to that of the axial modes. These results clearly show the importance of general relativity for the pulsation modes of compact stars, and that there are modes whose existence does not depend on motions of the fluid at all, namely pure `space-time' modes.

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 Dates: 1996
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: eDoc: 60225
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 280 (4) Sequence Number: - Start / End Page: 1230 - 1234 Identifier: ISSN: 0035-8711