BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Neutrino-Induced Polarization Rotation in Astrophysical Plasmas DTSTART:20260609T163000Z DTEND:20260609T180000Z DTSTAMP:20260912T100322Z UID:b9365524-4407-4139-8246-008f02266035 SEQUENCE:2 CREATED:20260603T082322Z DESCRIPTION:Neutrinos are among the most abundant particles in the Univers e and provide a unique probe of fundamental physics and extreme astrophysi cal environments. Although electrically neutral\, their nonzero masses ind uce electromagnetic properties at loop level through Standard Model weak i nteractions. The dominant optical effect is parity-violating birefringence in asymmetric chiral neutrino media. This effect rotates the polarization plane of electromagnetic radiation propagating through neutrino-permeated plasmas. In this seminar\, we discuss neutrino-induced birefringence in p lasmas associated with active galactic nuclei (AGN) (arXiv:2601.15910 [hep -ph]). We show that the relative bulk motion between the neutrino backgrou nd and the plasma introduces a directionality factor that gives rise to an anomalous frequency dependence distinct from conventional Faraday rotatio n. We evaluate the effect in AGN jets\, relic cosmic-neutrino backgrounds\ , and accretion-disk plasmas. We also present a hyperaccretion scenario ar ound stellar-mass black holes in which intense neutrino fluxes can signifi cantly enhance the signal. Although the predicted rotation angles remain b elow current observational sensitivity\, the distinctive spectral signatur es provide a framework for probing neutrino asymmetries and astrophysical plasma properties independently of magnetic-field models LAST-MODIFIED:20260603T082404Z LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/neutrino-induced-polarizat ion-rotation-in-astrophysical-plasmas/ X-ALT-DESC;FMTTYPE=text/html:

Neutrinos are among the most abundant particles in the Universe and provide a unique probe of fundamental physics and extreme astrophysical environments. Although elec trically neutral\, their nonzero masses induce electromagnetic properties at loop level through Standard Model weak interactions. The dominant optic al effect is parity-violating birefringence in asymmetric chiral neutrino media.

This effect rotates the polarization plane of electromagn etic radiation propagating through neutrino-permeated plasmas. In this sem inar\, we discuss neutrino-induced birefringence in plasmas associated wit h active galactic nuclei (AGN) (arXiv:2601.15910 [hep-ph]). We show that t he relative bulk motion between the neutrino background and the plasma int roduces a directionality factor that gives rise to an anomalous frequency dependence distinct from conventional Faraday rotation. We evaluate the ef fect in AGN jets\, relic cosmic-neutrino backgrounds\, and accretion-disk plasmas.

We also present a hyperaccretion scenario around stella r-mass black holes in which intense neutrino fluxes can significantly enha nce the signal. Although the predicted rotation angles remain below curren t observational sensitivity\, the distinctive spectral signatures provide a framework for probing neutrino asymmetries and astrophysical plasma prop erties independently of magnetic-field models

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