[Users] Computing Apparent Horizons

[Zach Etienne]

Dear Mario,

With the help of fellow Einstein Toolkit Maintainer Roland Haas, I wrote a
library for reading in Cartesian grid data to AHFinderDirect and
QuasiLocalMeasures (additional, isolated horizon diagnostics) from any
numerical relativity code. The code is open source, and has been used to
analyze horizons from spacetime data generated by NRPy+.

Here's how you get it:

git clone https://bitbucket.org/zach_etienne/et_minimal_2019_03.git
cd et_minimal_2019_03
git checkout remotes/origin/with_quasilocalmeasures

Check out the README.md

-Zach

*     *     *
Zachariah Etienne
Assoc. Prof. of Physics, U. of Idaho
Adjunct Assoc. Prof. of Physics & Astronomy, West Virginia U.
https://etienneresearch.com
https://blackholesathome.net


On Fri, Sep 23, 2022 at 6:36 AM Mario Imbrogno <mario.imbrogno97 at gmail.com>
wrote:

> Dear Einstein-Toolkit community,
>
> my name is Mario Imbrogno and I am a Ph.D. student at
> the University of Calabria (UniCal, Cosenza, Italy) under the supervision
> of prof. Sergio Servidio.
>
> Our research group had developed a spectral code to solve the Einstein
> equations via a
> pseudo-spectral technique [Meringolo C, Servidio S, and Veltri P "A
> spectral method algorithm for numerical
> simulations of gravitational fields." Classical and Quantum Gravity 38.7
> (2021): 075027], and I am studying different cases of merging two and more
> black holes, in vacuum conditions.
>
> Now I have to compute the apparent horizons (AHs) just for our initial
> conditions, and I have
> read that the Einstein Toolkit implements the AHFinderDirect, a code that
> can detect the AHs.
>
> My questions are: is there a way to compute such AHs by, just uploading
> our 3D cartesian BSSN fields and
> using the AHFinderDirect code?
>
> Who is(are) the user(s) that mainly use(s) such code? Who can I ask?
>
> Where can I find a detailed guide in which I can learn how to upload my
> data using the AHFinderDirect code?
>
> If someone will help us, there is no problem for us to include as a
> co-author of our paper.
>
> Best regards,
>
> Mario Imbrogno
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