[Users] mass estimation of neutron star

[林家暉]

Dear Roland,

Thanks for your reply.
I would check out those works.

In addition , I would like to ask question about computation consumption. For the BNS merger (using .par file in the gallery file), it costs about 5000 core hours (48 cores for 100 hours) for the completed simulation (to iteration=15000). Is it reasonable? And is there some way to save the computational resources ?

Best regards,

Chia-Hui

________________________________
寄件者: Roland Haas <rhaas at illinois.edu>
寄件日期: 2018年9月27日 上午 05:37:02
收件者: 林家暉
副本: Einstein Toolkit Users
主旨: Re: [Users] mass estimation of neutron star

Hello Chia-Hui,

>   1.  It is GRMHD code so that it should be able to consider magnetic
> field. Is magnetic field considered in the gallery example of BNS?
> Because I did not see the relevant output data.
I do not think there is an explicit magnetised BNS example in the
gallery. There is a single magnetised star in the runs we did for the
GRHydro MHD paper, for which you can find the parameter file here:
https://www.einsteintoolkit.org/mp.html in the magnetized TOV parfile
https://www.einsteintoolkit.org/publications/2013_MHD/par/tov/tov8m3.par

A binary could likely be set up similarly. You can also try and see if
IllinoisGRMHD (part of the Einstein Toolkit) has parameter files for
this situation.

>   2.  I would like to simulate r-process in the future, is GRHydro
> capable of it ? Because time scale for r-process is much larger than
> BNS merger, so maybe I will need other thorn ?
There is no nucleosynthesis code available in the Einstein Toolkit. For
postprocessing you could have a look at Jonas Lippuner's SkyNet code:
http://jonaslippuner.com/research/skynet/ which was used to postprocess data from supernova simulations using the Einstein Toolkit https://arxiv.org/abs/1712.09370

It is likely too slow (since it contains too many species) to directly
use it during evolution (and there is no equation of state implemented
right now that would allow for multiple species in the gas, though you
may ask around in the list of someone has implemented anything they
would be willing to share).

Yours,
Roland

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