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This study uses Type Ic core-collapse supernovae to constrain the properties of hypothetical exotic particles called axion-like particles that could decay into gamma rays. Unlike previous constraints from Supernova 1987A, Type Ic supernovae have compact progenitor stars that prevent stellar material from blocking potential gamma-ray signals, making them more effective probes. By analyzing non-detections from the Fermi-LAT telescope and the absence of signals from supernova 1998bw, the researchers establish tighter limits on these particles than previously achieved, particularly for particles with short decay lengths.
Why it matters
These findings help narrow down the possible properties of hypothetical particles that could constitute dark matter or solve other fundamental physics puzzles. The improved constraints guide theoretical physicists in developing models of particle physics beyond the Standard Model and inform future searches for exotic particles.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
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Abstract: Supernova (SN) 1987A provides classic bounds on gamma-ray flashes from the radiative decay of sub-GeV particles, but the latter may decay so rapidly as to be shielded by the stellar envelope. Using axionlike particles with photon coupling as a benchmark, we show that Type Ic core-collapse supernovae largely evade this attenuation due to their compact progenitors. We identify two regimes. At small couplings, while individual flashes may be missed by Fermi-LAT, the high Type Ic rate enables a stacking analysis of nondetections. At larger couplings, decay photons trigger fireball formation; the absence of a signal from the rare broad-lined Type Ic SN 1998bw excludes this scenario. The resulting bounds significantly exceed those from SN 1987A for short decay lengths.
Source: Small Progenitors, Large Couplings: Type Ic Supernova Constraints on Radiatively Decaying Particles