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 <[email protected]> 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 _______________________________________________ Users mailing list [email protected] http://lists.einsteintoolkit.org/mailman/listinfo/users
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