Gravitational-wave imprints of non-convex dynamics in binary neutron star mergers
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| Format: | Preprint |
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2024
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| _version_ | 1866917613473366016 |
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| author | Rivieccio, Giuseppe Guerra, Davide Ruiz, Milton Font, José A. |
| author_facet | Rivieccio, Giuseppe Guerra, Davide Ruiz, Milton Font, José A. |
| contents | Explaining gravitational-wave (GW) observations of binary neutron star (BNS) mergers requires an understanding of matter beyond nuclear saturation density. Our current knowledge of the properties of high-density matter relies on electromagnetic and GW observations, nuclear physics experiments, and general relativistic numerical simulations. In this paper we perform numerical-relativity simulations of BNS mergers subject to non-convex dynamics, allowing for the appearance of expansive shock waves and compressive rarefactions. Using a phenomenological non-convex equation of state we identify observable imprints on the GW spectra of the remnant. In particular, we find that non-convexity induces a significant shift in the quasi-universal relation between the peak frequency of the dominant mode and the tidal deformability (of order $Δf_{\rm peak}\gtrsim 380\,\rm Hz$) with respect to that of binaries with convex (regular) dynamics. Similar shifts have been reported in the literature, attributed however to first-order phase transitions from nuclear/hadronic matter to deconfined quark matter. We argue that the ultimate origin of the frequency shifts is to be found in the presence of anomalous, non-convex dynamics in the binary remnant. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_06849 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gravitational-wave imprints of non-convex dynamics in binary neutron star mergers Rivieccio, Giuseppe Guerra, Davide Ruiz, Milton Font, José A. High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology Explaining gravitational-wave (GW) observations of binary neutron star (BNS) mergers requires an understanding of matter beyond nuclear saturation density. Our current knowledge of the properties of high-density matter relies on electromagnetic and GW observations, nuclear physics experiments, and general relativistic numerical simulations. In this paper we perform numerical-relativity simulations of BNS mergers subject to non-convex dynamics, allowing for the appearance of expansive shock waves and compressive rarefactions. Using a phenomenological non-convex equation of state we identify observable imprints on the GW spectra of the remnant. In particular, we find that non-convexity induces a significant shift in the quasi-universal relation between the peak frequency of the dominant mode and the tidal deformability (of order $Δf_{\rm peak}\gtrsim 380\,\rm Hz$) with respect to that of binaries with convex (regular) dynamics. Similar shifts have been reported in the literature, attributed however to first-order phase transitions from nuclear/hadronic matter to deconfined quark matter. We argue that the ultimate origin of the frequency shifts is to be found in the presence of anomalous, non-convex dynamics in the binary remnant. |
| title | Gravitational-wave imprints of non-convex dynamics in binary neutron star mergers |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2401.06849 |