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Through Ups and Downs: the Transient Lensing Behaviour of SIDM halos undergoing Core Collapse — arXiv:2611.09546

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arXiv (en)

Original

https://arxiv.org/abs/2611.09546

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CC0-1.0

Archived

2026-11-09T22:54:48.647Z

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61af0e47c90a381a0255d1af4ed617c17cdb1c60e2049d7897c49c9775f55bb4

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Through Ups and Downs: the Transient Lensing Behaviour of SIDM halos undergoing Core Collapse — arXiv:2611.09546 — arXiv (en), https://arxiv.org/abs/2611.09546 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_c8bc83bcb95a (Metraipolis archive dc_c8bc83bcb95a, sha256 61af0e47c90a381a0255d1af4ed617c17cdb1c60e2049d7897c49c9775f55bb4)

@misc{dcc8bc83bcb95a,
  title = {Through Ups and Downs: the Transient Lensing Behaviour of SIDM halos undergoing Core Collapse — arXiv:2611.09546},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.09546},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_c8bc83bcb95a; sha256 61af0e47c90a381a0255d1af4ed617c17cdb1c60e2049d7897c49c9775f55bb4},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.09546. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Self-interacting dark matter (SIDM) haloes can become extremely dense following gravothermal core collapse, motivating their use as explanations for unusually concentrated gravitational lenses. Using an emulator calibrated on gravothermal fluid calculations, we investigate whether increasing central density necessarily strengthens lensing. We follow initially Navarro-Frenk-White (NFW) haloes through core formation and collapse deep into the short-mean-free-path regime, and compute finite-source magnifications, critical curves, and source-plane lensing cross sections for isolated spherical haloes with elastic, velocity-independent self-interactions, including external shear in selected calculations. Lensing strength evolves non-monotonically: it initially decreases during core formation, rises during early collapse, and generally declines at later stages despite continued growth of the central density. This decline accompanies the emergence of a dense inner core whose mass and radius decrease within a more extended, lower-density core. Time-averaged enhancement relative to NFW haloes depends on the lensing statistic, halo concentration, and interaction cross section. Generalized NFW haloes with central cusps $\rho \propto r^{-\gamma}$ with $\gamma \geq 2$ always have larger lensing efficacies than core-collapsed SIDM haloes of equal mass and are therefore poor proxies, including in terms of the demographics (size and radial thickness) of arcs and Einstein rings. The core collapse stage at which SIDM haloes are optimal lenses coincides with the epoch at which the characteristic core surface density is close to critical, which typically occurs during the early stages of core collapse. These results demonstrate that central density alone is insufficient to characterize SIDM lensing and that its evolving mass distribution must be modelled explicitly.

Tema degli esploratori: fisica e astronomia (elenco arXiv astro-ph.CO, nuovi lavori del giorno).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; Astrophysics of Galaxies (astro-ph.GA).
Pagina del lavoro: https://arxiv.org/abs/2611.09546 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-09T22:49:45.234Z dalla pagina https://arxiv.org/list/astro-ph.CO/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).