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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | https://arxiv.org/abs/2604.25542 |
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| _version_ | 1866911730515312640 |
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| author | Yang, Yi |
| author_facet | Yang, Yi |
| contents | AMS-02 measurements show a striking separation between the characteristic energy scales of cosmic-ray electrons and positrons: the electron spectrum peaks near the ordinary retarded cooling scale, while the positron spectrum exhibits a high-energy structure at hundreds of GeV. I ask whether this hierarchy can be interpreted without introducing a dedicated additional positron source, dark matter component, or fine-tuned source population. Motivated by the Dirac/Feynman-Stueckelberg viewpoint, I formulate an effective transport response in which the positron sector contains a retarded branch and an advanced-associated branch with reduced accumulated radiative exposure. Two minimal realizations, a one-zone response model and a local-source response model, are used to compare the AMS-02 electron and positron spectra. In the cleaner local-source realization, the high-energy positron structure is carried predominantly by the advanced-associated branch, with an order-one branch weight and a strongly reduced effective exposure. I also discuss consistency conditions showing that this interpretation cannot be reduced to a simple survival-suppression or ordinary decoherence model. The result should be read as a possible advanced-associated positron response interpretation of the AMS-02 spectral hierarchy, not as a full Galactic propagation fit or a proof of microscopic backward-in-time propagation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25542 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Possible Advanced Positron Signal in AMS-02 Measurements Yang, Yi High Energy Physics - Phenomenology AMS-02 measurements show a striking separation between the characteristic energy scales of cosmic-ray electrons and positrons: the electron spectrum peaks near the ordinary retarded cooling scale, while the positron spectrum exhibits a high-energy structure at hundreds of GeV. I ask whether this hierarchy can be interpreted without introducing a dedicated additional positron source, dark matter component, or fine-tuned source population. Motivated by the Dirac/Feynman-Stueckelberg viewpoint, I formulate an effective transport response in which the positron sector contains a retarded branch and an advanced-associated branch with reduced accumulated radiative exposure. Two minimal realizations, a one-zone response model and a local-source response model, are used to compare the AMS-02 electron and positron spectra. In the cleaner local-source realization, the high-energy positron structure is carried predominantly by the advanced-associated branch, with an order-one branch weight and a strongly reduced effective exposure. I also discuss consistency conditions showing that this interpretation cannot be reduced to a simple survival-suppression or ordinary decoherence model. The result should be read as a possible advanced-associated positron response interpretation of the AMS-02 spectral hierarchy, not as a full Galactic propagation fit or a proof of microscopic backward-in-time propagation. |
| title | A Possible Advanced Positron Signal in AMS-02 Measurements |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2604.25542 |