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Inverse approach to Einstein’s equations for fluids with vanishing anisotropic stress tensor

James Richardson and Mustapha Ishak*

  • Department of Physics, University of Texas at Dallas, Richardson, Texas 75083, USA

  • *mishak@utdallas.edu
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Phys. Rev. D 77, 044005 – Published 4 February, 2008

DOI: https://doi.org/10.1103/PhysRevD.77.044005

Abstract

We expand previous work on an inverse approach to Einstein field equations where we include fluids with energy flux and consider the vanishing of the anisotropic stress tensor. We consider the approach using warped product spacetimes of class B1. Although restricted, these spacetimes include many exact solutions of interest to compact object studies and to cosmological models studies. The question explored here is as follows: given a spacetime metric, what fluid flow (timelike congruence), if any, could generate the spacetime via Einstein’s equations? We calculate the flow from the condition of a vanishing anisotropic stress tensor and give results in terms of the metric functions in the three canonical types of coordinates. A condition for perfect fluid sources is also provided. The framework developed is algorithmic and suited for the study and validation of exact solutions using computer algebra systems. The framework can be applied to solutions in comoving and noncomoving frames of reference, and examples in different types of coordinates are worked out.

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Phys. Rev. D 77, 044005– Published 4 February, 2008
  • Received 16 June 2007

© 2008 American Physical Society

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