PreprintCC BY 4.0arXiv
Presupernovae Strongly Constrain Electrophilic MeV Bosons
Abstract
The years preceding a supernova (SN) can constrain new electrophilic bosons with MeV masses more than the explosion itself. Although cooler than SNe, the massive progenitors maintain consistently high temperatures much longer, injecting more particles whose decays to positrons contribute to the diffuse Galactic 511-keV emission. For dark photons, the increase is exacerbated by the lower plasma frequency compared to SNe, where MeV excitations are screened. We find preSNe bounds on dark photon couplings up to two orders of magnitude stronger than SNe for masses between 1 and 3~MeV, with similar improvements for other electrophilic species such as axion-like particles.
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BibTeX
@misc{cheng2026presupernovae,
title = {{Presupernovae Strongly Constrain Electrophilic MeV Bosons}},
author = {Yu Cheng and Damiano F. G. Fiorillo and Chui-Fan Kong and Edoardo Vitagliano},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.03813},
eprint = {2611.03813},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.03813},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Presupernovae Strongly Constrain Electrophilic MeV Bosons
AU - Yu Cheng
AU - Damiano F. G. Fiorillo
AU - Chui-Fan Kong
AU - Edoardo Vitagliano
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.03813
UR - https://arxiv.org/abs/2611.03813
AB - The years preceding a supernova (SN) can constrain new electrophilic bosons with MeV masses more than the explosion itself. Although cooler than SNe, the massive progenitors maintain consistently high temperatures much longer, injecting more particles whose decays to positrons contribute to the diffuse Galactic 511-keV emission. For dark photons, the increase is exacerbated by the lower plasma frequency compared to SNe, where MeV excitations are screened. We find preSNe bounds on dark photon couplings up to two orders of magnitude stronger than SNe for masses between 1 and 3~MeV, with similar improvements for other electrophilic species such as axion-like particles.
ER -