Analysing the LIGO GW190425 event

I worked on a project to simulate BNS initial data with MPA1 EoS, with various mass ratios to model the GW190425 event. Owing to the high source-frame chirp mass and total mass of this event, which was higher than any BNS system observed before then, and the absence of an EM counterpart for the GW signal, most of the analysis done regarding the event modeled it as a black hole neutron star (BHNS) merger. We, however, explore the possibility of this being a BNS event and the implications of this for the EoS of the BNS and also discuss the absent EM counterpart in our paper. We explored the simulations with APR4, DD2 and MPA1 EoS and found significant match between the signal from the APR4 simulation with 0.7 mass ration between the two stars and the BHNS signal that we simulated, keeping within the constraints of the GW190425 event. The initial data was generated using Sgrid and the evolutions were carried out using the BAM program. Some of the results for the MPA1 EoS from my simulations are a part of the second release of the GW database of CoRe.

Related publication: arXiv:2109.04063, arXiv:2210.16366.
Project personel: R. Dudi, A. Adhikari, B. Brügmann, T. Dietrich, K. Hayashi, K. Kawaguchi, K. Kiuchi, K. Kyutoku, M. Shibata, W. Tichy