Gravothermal Collapse: Robust Against Baryonic Feedback
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arXiv
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914617649790976 |
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| author | Kong, Demao Yu, Hai-Bo |
| author_facet | Kong, Demao Yu, Hai-Bo |
| contents | We perform a stress test of gravothermal collapse in self-interacting dark matter (SIDM) halos under baryonic feedback using a semi-analytical oscillating-potential model in controlled N-body simulations. For high-concentration halos, where the SIDM thermalization timescale is short, gravothermal collapse is only mildly delayed and never stalled, even under extremely strong feedback. In contrast, the collapse of a median-concentration halo can be significantly delayed, but it resumes once feedback ceases. The final density profile of such halos depends sensitively on the episodic feedback history, producing a broad diversity in central densities. These results strengthen the interpretation of dense compact perturbers identified in recent strong-lensing observations as core-collapsed SIDM halos. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_31335 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Gravothermal Collapse: Robust Against Baryonic Feedback Kong, Demao Yu, Hai-Bo Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology We perform a stress test of gravothermal collapse in self-interacting dark matter (SIDM) halos under baryonic feedback using a semi-analytical oscillating-potential model in controlled N-body simulations. For high-concentration halos, where the SIDM thermalization timescale is short, gravothermal collapse is only mildly delayed and never stalled, even under extremely strong feedback. In contrast, the collapse of a median-concentration halo can be significantly delayed, but it resumes once feedback ceases. The final density profile of such halos depends sensitively on the episodic feedback history, producing a broad diversity in central densities. These results strengthen the interpretation of dense compact perturbers identified in recent strong-lensing observations as core-collapsed SIDM halos. |
| title | Gravothermal Collapse: Robust Against Baryonic Feedback |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2605.31335 |