[Users] hybrid star setup in the TOVSolver thorn

[Roland Haas]

Hello all,

There's also David Boyer's TOVola TOV initial data thorn (scheduled to
be included in the November release of the ET), which may work.


I have added David Boyer, its author, would you be able to comment on
this?

Yours,
ROland

> Hi,
> 
> there is another TOV solver available in the "reprimand" thorn. It only
> solves the NS equations, however, but does not set up any initial data.
> It provides ordinary C++ functions for EOS handling and TOV solving,
> but there is no cactus interface. To set up initial data, you would
> need to write a small thorn or replace the TOV solver part in the 
> available TOVSolver thorn with calls to reprimand.
> The thorn is a based on the standalone C++ library also named reprimand
> (which also has a python interface that can be pip-installed).
> https://urldefense.com/v3/__https://github.com/wokast/RePrimAnd__;!!DZ3fjg!4WBu1NbiMkSGYMbSU8W8qB8IVFzdObuye5dNzEsoJwj9G2Q8ePTVScADQ-LAVcLuS83gGIfHME_Jd__wJwI$ 
> It is documented here
> https://urldefense.com/v3/__https://wokast.github.io/RePrimAnd/index.html__;!!DZ3fjg!4WBu1NbiMkSGYMbSU8W8qB8IVFzdObuye5dNzEsoJwj9G2Q8ePTVScADQ-LAVcLuS83gGIfHME_JdzDq5BM$ 
> 
> It might be well suited for your special use case since it is designed
> for dealing also with discontinuous EOS, as described in this article:
> https://urldefense.com/v3/__https://arxiv.org/abs/2404.11346__;!!DZ3fjg!4WBu1NbiMkSGYMbSU8W8qB8IVFzdObuye5dNzEsoJwj9G2Q8ePTVScADQ-LAVcLuS83gGIfHME_JE0V6tP0$ 
> 
> 
> Cheers,
> Wolfgang.
> 
> On Thu, 2024-10-31 at 20:58 +0000, CJ Osakwe wrote:
> > 
> > Hello,
> > 
> > 
> > I am trying to set up a stable hybrid star (with a quark matter core
> > and hadronic crust, each with their own equation of state) in the
> > Einstein Toolkit. My initial approach was to adapt the TOVSolver
> > thorn to achieve this, but the code is removing the density
> > discontinuity at the hadronic-quark matter interface when it
> > interpolates from 1D to 3D. As well the discontinuity doesn't seem to
> > be reflected in the pressure anyway. I'm wondering if there is a
> > thorn that is better suited for setting up a stable hybrid star?
> > 
> > 
> > Cheers,
> > CJ Osakwe
> > PhD candidate, Department of Physics and Astronomy
> > University of Calgary
> > 
> > 
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Yours,
Roland

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