About
We study the transport of self-interacting millicharged particles (MCPs) coupled to a massless dark photon in core-collapse supernovae (SNe), focusing on masses above the MeV scale. In this regime, strong self-couplings drive the formation of a relativistic fluid rather than a free-streaming gas. We extend the hydrodynamic framework developed for light MCPs to heavier masses, revisiting production, thermalization, and transport. Neglecting self-interactions at higher masses can lead to a qualitatively incomplete description of energy deposition and particle outflows. The interplay between self-interactions and trapping modifies the boundary between free-streaming and hydrodynamic regimes, indicating that standard SN cooling arguments may require revision. This framework provides a basis to account for fluid effects when assessing supernova constraints across sub-GeV and multi-MeV dark sectors.
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The talk
Credits and licence
- Institution
- CERN
- Speaker
- Mariachiara Ingicco
- Year
- 2026
- Language
- English
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
- CERN gives no rating. Invisible Network shows it to Teens profiles and older, judged from what the source says about it. How courses are placed