Generating potentials via difference equations

Details Generating potentials via difference equations Generating potentials via difference equations

2006-05-11

arxiv.org/abs/gr-qc/0605069v1

Math.Methods Appl.Sci. 29 (2006) 1943-1952

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, To appear in Math. Meth. Appl. Sci

Scientific paper

10.1002/mma.756

The condition for pressure isotropy, for spherically symmetric gravitational fields with charged and uncharged matter, is reduced to a recurrence equation with variable, rational coefficients. This difference equation is solved in general using mathematical induction leading to an exact solution to the Einstein field equations which extends the isotropic model of John and Maharaj. The metric functions, energy density and pressure are well behaved which suggests that this model could be used to describe a relativistic sphere. The model admits a barotropic equation of state which approximates a polytrope close to the stellar centre.

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