Little Red Dots can contribute ~30% of the diffuse neutrino background at TeV-sub-PeV energies through photomeson production in black hole envelopes, with modified flavor ratios at higher energies.
Relativistic Photon Mediated Shocks
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abstract
A system of equations governing the structure of a steady, relativistic radiation dominated shock is derived, starting from the general form of the transfer equation obeyed by the photon distribution function. Closure is obtained by truncating the system of moment equations at some order. The anisotropy of the photon distribution function inside the shock is shown to increase with increasing shock velocity, approaching nearly perfect beaming at upstream Lorentz factors $\Gamma_{-}>>1$. Solutions of the shock equations are presented for some range of upstream conditions. These solutions are shown to converge as the truncation order is increased.
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Synchrotron self-absorption alters radiation-mediated shock profiles for magnetizations above 10^{-8}, subshocks appear above 0.1, and hadronic processes add a high-energy photon tail with negligible effect on overall shock dynamics.
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Little Red Dots as Hidden Neutrino Sources
Little Red Dots can contribute ~30% of the diffuse neutrino background at TeV-sub-PeV energies through photomeson production in black hole envelopes, with modified flavor ratios at higher energies.
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Magnetized Shocks Mediated by Radiation from Leptonic and Hadronic Processes
Synchrotron self-absorption alters radiation-mediated shock profiles for magnetizations above 10^{-8}, subshocks appear above 0.1, and hadronic processes add a high-energy photon tail with negligible effect on overall shock dynamics.