[Users] GRHydro negative rho

Erik Schnetter schnetter at cct.lsu.edu
Fri Aug 6 19:48:21 CDT 2021


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On Thu, Jul 22, 2021 at 11:05 PM Nick Olsen <n.olsen.3.711 at gmail.com> wrote:
> Hello there
> I have been learning how to use and working with the Einstein Toolkit for a few months now and I have gotten to a point where I wanted to implement a photon gas with (locally) negative rho as part of my research, following a paper written by one of my supervisor's PhD students. While looking into it I found that GRHydro automatically discards negative values of rho and replaces them with rho_abs_min, and I can't set rho_ans_min to a negative value because they are ignored according to the documentation.
> I was wondering if there is a way to set rho_abs_min to be negative without it being ignored, or a way to circumvent the check for negative values of rho somehow to allow for negative values. I have some experience with rewriting thorns for my own purposes but GRHydro isn't as simple as the thorns I've been changing.
> Thanks,
> Nicholas Olsen, University of Waterloo
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Erik Schnetter <schnetter at cct.lsu.edu>

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