[Users] Baryonic mass

Theodoros Soultanis thsoulta at physics.auth.gr
Mon Nov 12 14:42:48 CST 2018

Dear Roland,

Thank for the quick, and detailed reply. I will try those and give you  
an update.

Theodoros Soultanis

Περιορίζοντας Roland Haas <rhaas at illinois.edu>:

> Hello Thomas,
> there are basically two ways of doing this.
> 1. if you are using GRHydro or IllinoisGRHMD then both of then define a
> variable "dens" which is the relativistic rest mass density. Asking for
> a "sum" reducing of that variable computes the total rest mass *up to*
> having to multiple it by the product of dx*dy*dz (ie the values you
> specified in your parfile as CoordBase::dx, dy, dz). Something like
> this:
> CarpetIOScalar::outScalar_vars = "GRhydro::dens"
> CarpetIOSCalar::outScalar_reductions = "sum"
> CarpetIOScalar::outScalar_every = 1
> (untested!) is what you will have to add to your parfile.
> 2. you can use the RestMass thorn that has just been proposed on this
> mailing list:
> http://lists.einsteintoolkit.org/pipermail/users/2018-November/006632.html
> You can find the pull request for it on bitbucket:
> https://bitbucket.org/einsteintoolkit/einsteinanalysis/pull-requests/8/hydro_analysis-added-hydro_masses-in-order/diff
> the pull request contains example parfiles for both GRHydro and
> IllinoisGRMHD. If you find it useful, please contact the authors in
> particular Federico Cipolletta <cipo87 at gmail.com> (who spoke up on the
> mailing list) who may be interested in working with you to document
> "external interest" in the modification which helps getting it into the
> ET.
> There have been a number of discussion relating to rest mass, is
> conservation and how to measure its flux on the mailing list recently
> and you may want to consult the mailing list archive or search it using
> the information provided here:
> https://www.einsteintoolkit.org/support.html
> http://lists.einsteintoolkit.org/pipermail/users/
> Yours,
> Roland
>> Good morning,
>> It would be greatly appreciated if you could give me some feedback
>> regarding the following topic.
>> I would like know whether it is possible to calculate the total
>> baryonic mass of the given system during the evolution within the ET (
>> maybe there is a module which I was not able to find) or I have to
>> compute it externally.
>> Thank you.
>> Sincerely,
>> Theodoros Soultanis
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