Collective neutrino-antineutrino oscillations in dense neutrino environments?
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913186510274560 |
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| author | Fiorillo, Damiano F. G. Raffelt, Georg G. Sigl, Günter |
| author_facet | Fiorillo, Damiano F. G. Raffelt, Georg G. Sigl, Günter |
| contents | The paradigm-changing possibility of collective neutrino-antineutrino oscillations was recently advanced in analogy to collective flavor oscillations. However, the amplitude for the backward scattering process $ν_{\mathbf{p}_1}\overlineν_{\mathbf{p}_2}\toν_{\mathbf{p}_2}\overlineν_{\mathbf{p}_1}$ is helicity-suppressed and vanishes for massless neutrinos, implying that there is no off-diagonal refractive index between $ν$ and $\overlineν$ of a single flavor of massless neutrinos. For a nonvanishing mass, collective helicity oscillations are possible, representing de-facto $ν$--$\overlineν$ oscillations in the Majorana case. However, such phenomena are suppressed by the smallness of neutrino masses as discussed in the previous literature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_02478 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Collective neutrino-antineutrino oscillations in dense neutrino environments? Fiorillo, Damiano F. G. Raffelt, Georg G. Sigl, Günter High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena The paradigm-changing possibility of collective neutrino-antineutrino oscillations was recently advanced in analogy to collective flavor oscillations. However, the amplitude for the backward scattering process $ν_{\mathbf{p}_1}\overlineν_{\mathbf{p}_2}\toν_{\mathbf{p}_2}\overlineν_{\mathbf{p}_1}$ is helicity-suppressed and vanishes for massless neutrinos, implying that there is no off-diagonal refractive index between $ν$ and $\overlineν$ of a single flavor of massless neutrinos. For a nonvanishing mass, collective helicity oscillations are possible, representing de-facto $ν$--$\overlineν$ oscillations in the Majorana case. However, such phenomena are suppressed by the smallness of neutrino masses as discussed in the previous literature. |
| title | Collective neutrino-antineutrino oscillations in dense neutrino environments? |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2401.02478 |