Neutrino-Induced Polarization Rotation in Active Galactic Nuclei Plasmas
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Câmara, H. B. Smetana, A. Tursunov, A. |
| author_facet | Câmara, H. B. Smetana, A. Tursunov, A. |
| contents | We study parity-violating birefringence induced by an asymmetric neutrino background in plasmas associated with active galactic nuclei (AGN). We derive a directionality factor arising from the relative bulk motion between the neutrino medium and plasma, and show that it can produce an anomalous frequency dependence of the polarization-rotation angle, distinct from the $ω^{-2}$ scaling of Faraday rotation. This anomalous scaling can occur either at the resonance plasma frequency condition $ω\simeq ω_p$, or when $E_ν^{0}\simeq m_νω/ω_p$ lies within the range of the neutrino energy spectrum. We estimate the effect for three scenarios: jets propagating through the cosmic neutrino background (C$ν$B), jets with an internal flux of high-energy neutrinos, and accretion-disk plasma permeated by the C$ν$B. Of the three scenarios, the latter gives the largest rotation angle $ϕ_{\rm d} \sim 10^{-35}\,\mathrm{rad}$, at X-ray frequencies. Although the predicted rotation angles are below current polarimetric sensitivity, the identified spectral signatures provide a theoretical framework for probing neutrino asymmetries and AGN plasma properties independent of magnetic field models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_15910 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Neutrino-Induced Polarization Rotation in Active Galactic Nuclei Plasmas Câmara, H. B. Smetana, A. Tursunov, A. High Energy Physics - Phenomenology High Energy Astrophysical Phenomena We study parity-violating birefringence induced by an asymmetric neutrino background in plasmas associated with active galactic nuclei (AGN). We derive a directionality factor arising from the relative bulk motion between the neutrino medium and plasma, and show that it can produce an anomalous frequency dependence of the polarization-rotation angle, distinct from the $ω^{-2}$ scaling of Faraday rotation. This anomalous scaling can occur either at the resonance plasma frequency condition $ω\simeq ω_p$, or when $E_ν^{0}\simeq m_νω/ω_p$ lies within the range of the neutrino energy spectrum. We estimate the effect for three scenarios: jets propagating through the cosmic neutrino background (C$ν$B), jets with an internal flux of high-energy neutrinos, and accretion-disk plasma permeated by the C$ν$B. Of the three scenarios, the latter gives the largest rotation angle $ϕ_{\rm d} \sim 10^{-35}\,\mathrm{rad}$, at X-ray frequencies. Although the predicted rotation angles are below current polarimetric sensitivity, the identified spectral signatures provide a theoretical framework for probing neutrino asymmetries and AGN plasma properties independent of magnetic field models. |
| title | Neutrino-Induced Polarization Rotation in Active Galactic Nuclei Plasmas |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.15910 |