Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915141492146176 |
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| author | Lam, Alan Tsz-Lok Staykov, Kalin V. Kuan, Hao-Jui Doneva, Daniela D. Yazadjiev, Stoytcho S. |
| author_facet | Lam, Alan Tsz-Lok Staykov, Kalin V. Kuan, Hao-Jui Doneva, Daniela D. Yazadjiev, Stoytcho S. |
| contents | Differentially rotating scalarized neutron stars, mimickers of binary merger remnants, can possess an enormous angular momentum larger than what could possibly be sustained in a neutron star in general relativity by about one order of magnitude. A natural question to ask is whether these solutions are stable and thus can realize in a binary coalescence. With this motivation in mind, we examine the criterion of dynamical stability against axisymmetric perturbations for these ultra-rotators by numerically tracking their nonlinear evolution in an axisymmetric setup. We demonstrate that the turning-point criterion still serves as a sufficient condition for asymmetric (in)stability. Our findings open an interesting question of whether the merger of two scalarized neutron stars can produce (possibly short-lived) ultra-highly rotating merger remnants. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_03973 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory Lam, Alan Tsz-Lok Staykov, Kalin V. Kuan, Hao-Jui Doneva, Daniela D. Yazadjiev, Stoytcho S. General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Differentially rotating scalarized neutron stars, mimickers of binary merger remnants, can possess an enormous angular momentum larger than what could possibly be sustained in a neutron star in general relativity by about one order of magnitude. A natural question to ask is whether these solutions are stable and thus can realize in a binary coalescence. With this motivation in mind, we examine the criterion of dynamical stability against axisymmetric perturbations for these ultra-rotators by numerically tracking their nonlinear evolution in an axisymmetric setup. We demonstrate that the turning-point criterion still serves as a sufficient condition for asymmetric (in)stability. Our findings open an interesting question of whether the merger of two scalarized neutron stars can produce (possibly short-lived) ultra-highly rotating merger remnants. |
| title | Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2502.03973 |