No Flavor Anisotropy in the High-Energy Neutrino Sky Upholds Lorentz Invariance
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917258261954560 |
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| author | Telalovic, Bernanda Bustamante, Mauricio |
| author_facet | Telalovic, Bernanda Bustamante, Mauricio |
| contents | Discovering Lorentz-invariance violation (LIV) would upend the foundations of modern physics. Because LIV effects grow with energy, high-energy astrophysical neutrinos provide the most sensitive tests of Lorentz invariance in the neutrino sector. We examine an understudied yet phenomenologically rich LIV signature: compass asymmetries, where neutrinos of different flavors propagate preferentially along different directions. Using the directional flavor composition of high-energy astrophysical neutrinos, i.e., the abundances of $ν_{e}$, $ν_μ$, and $ν_τ$ across the sky, we find no evidence of LIV-induced flavor anisotropy in 7.5 years of IceCube High-Energy Starting Events. Thus, we place upper limits on the values of hundreds of LIV parameters with operator dimensions 2-8, tightening existing limits by orders of magnitude and bounding hundreds of parameters for the first time. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_15468 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | No Flavor Anisotropy in the High-Energy Neutrino Sky Upholds Lorentz Invariance Telalovic, Bernanda Bustamante, Mauricio High Energy Physics - Phenomenology High Energy Astrophysical Phenomena High Energy Physics - Experiment High Energy Physics - Theory Discovering Lorentz-invariance violation (LIV) would upend the foundations of modern physics. Because LIV effects grow with energy, high-energy astrophysical neutrinos provide the most sensitive tests of Lorentz invariance in the neutrino sector. We examine an understudied yet phenomenologically rich LIV signature: compass asymmetries, where neutrinos of different flavors propagate preferentially along different directions. Using the directional flavor composition of high-energy astrophysical neutrinos, i.e., the abundances of $ν_{e}$, $ν_μ$, and $ν_τ$ across the sky, we find no evidence of LIV-induced flavor anisotropy in 7.5 years of IceCube High-Energy Starting Events. Thus, we place upper limits on the values of hundreds of LIV parameters with operator dimensions 2-8, tightening existing limits by orders of magnitude and bounding hundreds of parameters for the first time. |
| title | No Flavor Anisotropy in the High-Energy Neutrino Sky Upholds Lorentz Invariance |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena High Energy Physics - Experiment High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.15468 |