{"work":{"id":"670f8fa9-bf1f-48fe-a8e3-3e6c453db44e","openalex_id":null,"doi":null,"arxiv_id":"1410.3747","raw_key":null,"title":"Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles","authors":null,"authors_text":"A","year":2014,"venue":"astro-ph.HE","abstract":"We revise the bound from the supernova SN1987A on the coupling of ultralight axion-like particles (ALPs) to photons. In a core-collapse supernova, ALPs would be emitted via the Primakoff process, and eventually convert into gamma rays in the magnetic field of the Milky Way. The lack of a gamma-ray signal in the GRS instrument of the SMM satellite in coincidence with the observation of the neutrinos emitted from SN1987A therefore provides a strong bound on their coupling to photons. Due to the large uncertainty associated with the current bound, we revise this argument, based on state-of-the-art physical inputs both for the supernova models and for the Milky-Way magnetic field. Furthermore, we provide major amendments, such as the consistent treatment of nucleon-degeneracy effects and of the reduction of the nuclear masses in the hot and dense nuclear medium of the supernova. With these improvements, we obtain a new upper limit on the photon-ALP coupling: g_{a\\gamma} < 5.3 x 10^{-12} GeV^{-1}, for m_a < 4.4 x 10^{-10} eV, and we also give its dependence at larger ALP masses. Moreover, we discuss how much the Fermi-LAT satellite experiment could improve this bound, should a close-enough supernova explode in the near future.","external_url":"https://arxiv.org/abs/1410.3747","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-01T16:45:51.838241+00:00","pith_arxiv_id":"1410.3747","created_at":"2026-05-11T12:01:05.820147+00:00","updated_at":"2026-07-01T16:45:51.838241+00:00","title_quality_ok":true,"display_title":"Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles","render_title":"Revisiting the SN1987A gamma-ray limit on ultralight axion-like particles"},"hub":{"state":{"work_id":"670f8fa9-bf1f-48fe-a8e3-3e6c453db44e","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":12,"external_cited_by_count":null,"distinct_field_count":4,"first_pith_cited_at":"2021-09-07T18:00:00+00:00","last_pith_cited_at":"2026-05-25T18:50:57+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-07-01T20:31:34.362457+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":4},{"context_role":"baseline","n":1}],"polarity_counts":[{"context_polarity":"background","n":4},{"context_polarity":"baseline","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}