[Users] The generaion of initial data of BNS system with large mass ratio using Lorene

[Konrad Topolski]

Hi Jimmy

The lower mass that you are asking Lorene for is not realized for neutron stars (lower mass limit >~1.0M_sun)
and would rather approach the mass for a brown dwarf. This lower mass and the upper theoretical limit places an upper constraint
on the mass ratio to be around q~2. For initial data generation, this limit is of course equation of state - dependent.

Consistent with this fact and the theoretical constructions of the equations of state,
such a mass ratio is not achievable in the context of neutron stars. 

Out of the most extreme configurations I've seen,
FUKA initial data solver (publicly available) is known to achieve q~2.2 and
at least q~2.1 is achieved for SGRID code,  LORENE q~1.82, judging
from the CoRe database.

I do not have much experience with Lorene, but it might not be straightforward to achieve even the
theoretically admissible vicinity of q~2.0 due to domain decomposition issues.
Perhaps someone with more experience with it could clarify what's realizable with publicly available version of Lorene.

Best regards
Konrad Topolski

W dniu: Środa, Marzec 01, 2023 08:52 CET, 白济民 <beki-cat at sjtu.edu.cn> napisał(a):
 Hi everyone:
I intend to use Lorene to generate an unequal mass binary NS system with large q (with mass 1.4 Mo vs 0.2 Mo), that is, a very light NS orbiting around a standard mass NS. However, Lorene code seems to fail to generate .resu file at such large q and I wonder how can that be possible within Lorene. Is it still under development or can it be done by varying parameter settings in the corresponding parcoal file in Lorene/Codes/Bin_star directory?

I also wonder if there is a systematic procedure to adjust the parameter settings of parcoal to generate the initial data of a BNS system with small q?
Thanks in advance!
Best,
Jimmy
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