[Users] New Thorn: LlamaWaveHyperboloidal

Michael Jasiulek michael.jasiulek at aei.mpg.de
Wed Jul 17 08:34:41 CDT 2013

Hello all,

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


This thorn allows to evolve the scalar wave equation in 3D in Kerr spacetimes
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)
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

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
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

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


Michael Jasiulek

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