Tuesday, June 25, 2013

1306.5564 (Enrico Barausse et al.)

A Post-Newtonian approach to black hole-fluid systems    [PDF]

Enrico Barausse, Luis Lehner
This work devises a formalism to obtain the equations of motion for a black hole-fluid configuration. Our approach is based on a Post-Newtonian expansion and adapted to scenarios where obtaining the relevant dynamics requires long time-scale evolutions. These systems are typically studied with Newtonian approaches, which have the advantage that larger time-steps can be employed than in full general-relativistic simulations, but have the downside that important physical effects are not accounted for. The formalism presented here provides a relatively straightforward way to incorporate those effects in existing implementations, up to 2.5PN order, with lower computational costs than fully relativistic simulations.
View original: http://arxiv.org/abs/1306.5564

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