From mergers to collapse: scalarisation dynamics in neutron star binaries
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866908827678408704 |
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| author | Saló, Llibert Aresté Aguilera-Miret, Ricard Bezares, Miguel Sotiriou, Thomas P. |
| author_facet | Saló, Llibert Aresté Aguilera-Miret, Ricard Bezares, Miguel Sotiriou, Thomas P. |
| contents | We present the first fully non-linear evolutions of binary neutron star mergers in a moving-punctures approach in Einstein-scalar-Gauss-Bonnet gravity. We study both linear and quadratic-type couplings between the scalar and the Gauss-Bonnet invariant, and uncover new post-merger phenomena. These include an enhancement of the prompt collapse of a long-lived hyper-massive neutron star remnant and cases where the remnant develops a scalar configuration due to different scalarisation instabilities. This study initiates the exploration of beyond-General-Relativistic effects enhanced by the non-linear dynamics of the neutron star's fluid. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_10755 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | From mergers to collapse: scalarisation dynamics in neutron star binaries Saló, Llibert Aresté Aguilera-Miret, Ricard Bezares, Miguel Sotiriou, Thomas P. General Relativity and Quantum Cosmology We present the first fully non-linear evolutions of binary neutron star mergers in a moving-punctures approach in Einstein-scalar-Gauss-Bonnet gravity. We study both linear and quadratic-type couplings between the scalar and the Gauss-Bonnet invariant, and uncover new post-merger phenomena. These include an enhancement of the prompt collapse of a long-lived hyper-massive neutron star remnant and cases where the remnant develops a scalar configuration due to different scalarisation instabilities. This study initiates the exploration of beyond-General-Relativistic effects enhanced by the non-linear dynamics of the neutron star's fluid. |
| title | From mergers to collapse: scalarisation dynamics in neutron star binaries |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2602.10755 |