[Mesa-users] Adding a new particle species

[Jeremy Sakstein]

Thanks Frank.

Yes, it is indeed dark matter. I had a look at the axion cooling test suite
but it seems to treat it as a loss by adding an extra source of neutrinos.

I think I could use this to put the production rate in but am I right in
that the end products will, for all intents and purposes, escape the star?

Cheers,

Jeremy

On Mon, Aug 19, 2019 at 6:27 PM Francis Timmes <fxt44 at mac.com> wrote:

> seems like aspects of dark matter. if you peruse the inlist and add-ons at
> mesatsar.org,
> i believe there are a few contributions that do dark matter in their
> run_star_extras.
>
> fxt
>
>
>
> > On Aug 19, 2019, at 2:11 PM, Jeremy Sakstein <sakstein at sas.upenn.edu>
> wrote:
> >
> > So looking at this, I am not sure that the nets are exactly what I am
> looking for.
> >
> > Essentially, I would like to add a reaction where a photon combines with
> an electron to produce a heavy species (this would only happen at
> super-high temperatures of course) and then the heavy species remains in
> the core and contributes to the gravity but not the pressure i.e. there is
> no need to include it in the rates. The nearest thing to this I think is
> pair production but I can't seem to find where this is implemented. One
> idea I had was to use other neutrinos but I think this would not give me
> what I am looking for.
> >
> > Do you have any suggestions?
> >
> > Cheers,
> >
> > Jeremy
> >
> > On Mon, Aug 19, 2019 at 2:35 PM Jeremy Sakstein <sakstein at sas.upenn.edu>
> wrote:
> > Thanks Amber!
> >
> > I will take a look at what you suggest.
> >
> > Cheers,
> >
> > Jeremy
> >
> > On Mon, Aug 19, 2019 at 2:12 PM amber lauer <amberlauer at gmail.com>
> wrote:
> > Hi Jeremy, it's actually pretty easy.
> >
> > Look in your inlist star_job section and note the name of the network.
> >
> > The default version of this file is located in
> $MESA_DIR/data/net_data/nets/ .
> >
> > Copy this file to your model folder. Then open it with a text editor.
> Unless you are using one of the hard coded nets (approx21*) you will see
> the format is pretty easy to understand, there will be either:
> >
> > add_isos_and_reactions()
> >
> > or
> >
> > add_isos()
> >
> > add_reactions()
> >
> > (and possibly remove_reactions())
> >
> > I think the format is pretty self explanatory. If you use
> add_isos_and_reactions, you need only list the isos and the code will add
> all reactions connecting them. The alternative is to do it by hand using
> add_isos and add_reactions separately. But if you get stuck come back to
> the list and we can help.
> >
> > Just a note, whatever your network name, MESA will look in your local
> model folder for the file first. I recommend changing the name to something
> verbose (and changing the value in the inlist).
> >
> > Good luck!
> >
> > =================================
> > Dr. Amber Lauer
> > Postdoctoral Researcher
> > Triangle Universities Nuclear Lab
> > Duke University
> > amber.lauer at tunl.duke.edu
> >
> >
> > On Mon, Aug 19, 2019 at 10:48 AM Jeremy Sakstein <sakstein at sas.upenn.edu>
> wrote:
> > Hi Everyone,
> >
> > I would like to add a new particle species (with associated reactions)
> so that it contributes to the EOS and the density.
> >
> > How do I go about doing this? Is there a hook?
> >
> > Cheers,
> >
> > Jeremy
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> >
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> >
>
>
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