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Accessing Universal Relations of Binary Neutron Star Waveforms in Massive Scalar-Tensor Theory
Alan Tsz-Lok Lam1, Yong Gao1, Hao-Jui Kuan1
1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), 14476 Potsdam, Germany.
Abstract:
We investigate how the quasiuniversal relations connecting tidal deformability with gravitational waveform characteristics and/or properties of individual neutron stars that were proposed in the literature within general relativity would be influenced in the massive Damour-Esposito-Farese-type scalar-tensor gravity. For this purpose, we systematically perform numerical relativity simulations of ∼120 binary neutron-star mergers with varying scalar coupling constants. Although only three neutron-star equations of state are adopted, a clear breach of universality can be observed in the datasets. In addition to presenting difficulties in constructing quasiuniversal relations in alternative gravity theories, we also briefly compare the impacts of non-general-relativity physics on the waveform features and those due to the first order or cross-over quantum chromodynamical phase transition.
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