[Users] New Thorn: LlamaWave​Hyperboloidal​

[Michael Jasiulek]

Hello all,

here is a new thorn: https://bitbucket.org/mjasiulek/llamawavehyperboloidal
<https://bitbucket.org/mjasiulek/llamawavehyperboloidal>

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LlamaWaveHyperboloidal
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This thorn allows to evolve the scalar wave equation in 3D in Kerr spacetimes
using Kerr-Schild coordinates which are horizon penetrating. At some transition
radius the user can specify where the Kerr-Schild slicing becomes hyperboloidal,
thus, 'bends up' to scri (future null infinity). Therefore, no outer (and inner)
boundary
conditions have to be set, radiation leaves the spacetime 'naturally' through
the inner horizon and scri. The waveform at scri is readily computed during the
evolution.

It uses Llama's spherical 6-patch coordinates (r,u,v), the method-of-lines with
4th-order Runge-Kutta and 4th-,6th- or 8th-order spatial finite-differencing
and matching Kreiss-Oliger dissipation.

In http://arxiv.org/abs/1109.2513 <http://arxiv.org/abs/1109.2513> (or
http://iopscience.iop.org/0264-9381/29/1/015008/
<http://iopscience.iop.org/0264-9381/29/1/015008/> )
I used this code to study QNMs, late-time tails in Kerr at scri and to test the
novel hyperboloidal transformation used to smoothly attach the hyperboloidal
slice.

If you find this code useful, please cite the paper Class. Quantum Grav. 29
015008 (2012).

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Enjoy,
Michael Jasiulek


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