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SUMMARY:Shamik Niyogi\, "Probing Scalar-Induced First-Order Phase Transiti
 ons with the Diffuse Supernova Neutrino Background"
DTSTART:20261103T130000Z
DTEND:20261103T140000Z
DTSTAMP:20261101T002600Z
UID:indico-event-276@indico.zdv.uni-mainz.de
DESCRIPTION:We investigate the possibility of probing a scalar-induced fir
 st-order phase transition (FOPT) inside core-collapse supernovae through t
 he diffuse supernova neutrino background (DSNB). We consider a light scala
 r coupled to neutrinos that is produced and thermalised in the proto-neutr
 on-star core. This leads to two distinct neutrino components: a prompt con
 tribution from thermally produced scalars and a delayed\, spectrally narro
 w contribution from the decay of coherent scalar excitations due to the FO
 PT. We study the resulting DSNB signal at Super-Kamiokande\, Hyper-Kamioka
 nde\, and DUNE\, finding a strong dependence on the neutrino mass ordering
 . The recent Super-Kamiokande data already constrain the scalar parameter 
 space for inverted ordering and quasi-degenerate neutrino masses\, while f
 uture detectors can significantly improve this sensitivity. Our results de
 monstrate that DSNB measurements can provide a novel probe of finite-tempe
 rature scalar dynamics in core-collapse supernovae.\n\nhttps://indico.zdv.
 uni-mainz.de/event/276/
LOCATION:R. 05-127 (Lorentz-Room)
URL:https://indico.zdv.uni-mainz.de/event/276/
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