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Solution generating theorems for perfect fluid spheres

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arxiv gr-qc/0609088 v1 pith:4EWPS7F6 submitted 2006-09-20 gr-qc

classification gr-qc
keywords fluidperfectspheressolutiontheoremsdevelopbecausedensity
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The first static spherically symmetric perfect fluid solution with constant density was found by Schwarzschild in 1918. Generically, perfect fluid spheres are interesting because they are first approximations to any attempt at building a realistic model for a general relativistic star. Over the past 90 years a confusing tangle of specific perfect fluid spheres has been discovered, with most of these examples seemingly independent from each other. To bring some order to this collection, we develop several new transformation theorems that map perfect fluid spheres into perfect fluid spheres. These transformation theorems sometimes lead to unexpected connections between previously known perfect fluid spheres, sometimes lead to new previously unknown perfect fluid spheres, and in general can be used to develop a systematic way of classifying the set of all perfect fluid spheres. In addition, we develop new ``solution generating'' theorems for the TOV, whereby any given solution can be ``deformed'' to a new solution. Because these TOV-based theorems work directly in terms of the pressure profile and density profile it is relatively easy to impose regularity conditions at the centre of the fluid sphere.

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  1. Pressure profile bounds from relaxing the TOV equation

    gr-qc 2026-08 conditional novelty 5.0 of 10

    The authors prove several new upper and lower bounds on the internal pressure of relativistic fluid spheres under progressively stronger assumptions on the density profile.

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