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Static perfect fluids with Pant-Sah equations of state

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Abstract

We analyze the 3-parameter family of exact, regular, static, spherically symmetric perfect fluid solutions of Einstein’s equations (corresponding to a 2-parameter family of equations of state) due to Pant and Sah and “rediscovered” by Rosquist and by the present author. Except for the Buchdahl solutions which are contained as a limiting case, the fluids have finite radius and are physically realistic for suitable parameter ranges. The equations of state can be characterized geometrically by the property that the 3-metric on the static slices, rescaled conformally with the fourth power of any linear function of the norm of the static Killing vector, has constant scalar curvature. This local property does not require spherical symmetry; in fact it simplifies the proof of spherical symmetry of asymptotically flat solutions which we recall here for the Pant-Sah equations of state. We also consider a model in Newtonian theory with analogous geometric and physical properties, together with a proof of spherical symmetry of the asymptotically flat solutions.

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Authors and Affiliations

  1. Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced s/n, 37008, Salamanca, Spain

    Walter Simon

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  1. Walter Simon
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Correspondence to Walter Simon.

Additional information

Supported by grants FIS2006-05319 (Ministerio de Educación y Tecnología) and SA010C0 (Junta de Castillia y León).

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Simon, W. Static perfect fluids with Pant-Sah equations of state. Gen Relativ Gravit 40, 2591–2618 (2008). https://doi.org/10.1007/s10714-008-0641-5

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