[Mesa-users] Adding a new thermal particle

[Jeremy Sakstein]

Thanks Josiah,

Sorry,by VMO I meant PPSIN and that's great that MESA will see it.

Is there any test suite or inlist I can look at to help me learn how to use
other_EOS?

Cheers,

Jeremy

On Tue, Oct 15, 2019 at 11:09 PM Josiah Schwab via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi Jeremy,
>
> > Essentially, I want to add a new particle whose distribution is thermal,
> by
> > which I mean I can compute the pressure, and entropy as a function of its
> > mass (which I take as an input), and the density and temperature. The
> > phenomena is similar to pair production in that I expect that the EOS
> will
> > fall below 4/3 for some region of parameter space where the core
> > temperature is near the particle's mass but not so high that the particle
> > is relativistic.
> >
> > I can calculate the EOS directly using numerical integrals, or tabulate
> > this if it is easier.
> >
> > My questions are:
> >
> > 1) What is the best way of accomplishing this?
>
> Seems like you can get what you want by modifying the EOS, so I'd think
> it is most straight forward to use the other_eos hook and have it call
> the MESA eos and combine the results with your new EOS terms.
>
> > 2) Will I see the dynamical instability that I see when I run the VMO
> > test_suite if I implement it correctly?
>
> I don't know what VMO means and am hesitant to make definite statements
> about the future.  But people have used MESA to do pair-instability and
> pulsational-pair instability supernovae, so I know MESA models can react
> to a softening of the EOS.
>
> Josiah
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