Thursday, April 11, 2013

1304.2824 (L. Herrera et al.)

Newtonian polytropes for anisotropic matter: General framework and applications    [PDF]

L. Herrera, W. Barreto
We set up the general formalism to model polytropic Newtonian stars with anisotropic pressure. We obtain the corresponding Lane--Emden equation. A heuristic model based on an ansatz to obtain anisotropic matter solutions from known solutions for isotropic matter is adopted to illustrate the effects of the pressure anisotropy on the structure of the star. In particular we calculate the Chandrasekhar mass for a White Dwarf (WD). It is clearly displayed how the Chandrasekhar mass limit changes depending on the anisotropy. Prospective astrophysical applications of the proposed approach are discussed.
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