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BEGIN:VEVENT
SUMMARY:Neutrino-Induced Polarization Rotation in Astrophysical Plasmas
DTSTART:20260609T163000Z
DTEND:20260609T180000Z
DTSTAMP:20260922T004057Z
UID:b9365524-4407-4139-8246-008f02266035
SEQUENCE:1
CREATED:20260603T082312Z
DESCRIPTION: Neutrinos are among the most abundant particles in the Univer
 se and provide a unique probe of fundamental physics and extreme astrophys
 ical environments. Although electrically neutral\, their nonzero masses in
 duce electromagnetic properties at loop level through Standard Model weak 
 interactions. The dominant optical effect is parity-violating birefringenc
 e in asymmetric chiral neutrino media. This effect rotates the polarizatio
 n plane of electromagnetic radiation propagating through neutrino-permeate
 d plasmas. In this seminar\, we discuss neutrino-induced birefringence in 
 plasmas associated with active galactic nuclei (AGN) (arXiv:2601.15910 [he
 p-ph]). We show that the relative bulk motion between the neutrino backgro
 und and the plasma introduces a directionality factor that gives rise to a
 n anomalous frequency dependence distinct from conventional Faraday rotati
 on. We evaluate the effect in AGN jets\, relic cosmic-neutrino backgrounds
 \, and accretion-disk plasmas. We also present a hyperaccretion scenario a
 round stellar-mass black holes in which intense neutrino fluxes can signif
 icantly enhance the signal. Although the predicted rotation angles remain 
 below current observational sensitivity\, the distinctive spectral signatu
 res provide a framework for probing neutrino asymmetries and astrophysical
  plasma properties independently of magnetic-field models 
LAST-MODIFIED:20260603T082312Z
LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building
URL:http://df.vps.tecnico.ulisboa.pt/en/events/neutrino-induced-polarizati
 on-rotation-in-astrophysical-plasmas/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="bkgg6"> Neutrinos are amon
 g the most abundant particles in the Universe and provide a unique probe o
 f fundamental physics and extreme astrophysical environments. Although ele
 ctrically neutral\, their nonzero masses induce electromagnetic properties
  at loop level through Standard Model weak interactions. The dominant opti
 cal effect is parity-violating birefringence in asymmetric chiral neutrino
  media. <br/><br/>This effect rotates the polarization plane of electromag
 netic radiation propagating through neutrino-permeated plasmas. In this se
 minar\, we discuss neutrino-induced birefringence in plasmas associated wi
 th active galactic nuclei (AGN) (arXiv:2601.15910 [hep-ph]). We show that 
 the relative bulk motion between the neutrino background and the plasma in
 troduces a directionality factor that gives rise to an anomalous frequency
  dependence distinct from conventional Faraday rotation. We evaluate the e
 ffect in AGN jets\, relic cosmic-neutrino backgrounds\, and accretion-disk
  plasmas. <br/><br/>We also present a hyperaccretion scenario around stell
 ar-mass black holes in which intense neutrino fluxes can significantly enh
 ance the signal. Although the predicted rotation angles remain below curre
 nt observational sensitivity\, the distinctive spectral signatures provide
  a framework for probing neutrino asymmetries and astrophysical plasma pro
 perties independently of magnetic-field models </p>
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