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Radial oscillations and stability of multiple-fluid compact stars

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arxiv 2007.04311 v1 pith:HMIU4DTJ submitted 2020-07-08 gr-qc astro-ph.HEhep-ph

Radial oscillations and stability of multiple-fluid compact stars

classification gr-qc astro-ph.HEhep-ph
keywords compactderivationequationsfluidsoscillationspulsationradialstability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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I derive a system of pulsation equations for compact stars made up of an arbitrary number of perfect fluids that can be used to study radial oscillations and stability with respect to small perturbations. I assume spherical symmetry and that the only inter-fluid interactions are gravitational. My derivation is in line with Chandrasekhar's original derivation for the pulsation equation of a single-fluid compact star and keeps the contributions from the individual fluids manifest. I illustrate solutions to the system of pulsations equations with one-, two-, and three-fluid examples.

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