This content will become publicly available on November 1, 2023

Core-collapse supernova constraint on the origin of sterile neutrino dark matter via neutrino self-interactions
Abstract Novel neutrino self-interaction can open up viable parameter space for the relic abundance of sterile-neutrino dark matter (S ν DM). In this work, we constrain the relic target using core-collapse supernova which features the same fundamental process and a similar environment to the early universe era when S ν DM is dominantly produced. We present a detailed calculation of the effects of a massive scalar mediated neutrino self-interaction on the supernova cooling rate, including the derivation of the thermal potential in the presence of non-zero chemical potentials from plasma species. Our results demonstrate that the supernova cooling argument can cover the neutrino self-interaction parameter space that complements terrestrial and cosmological probes.
Authors:
; ; ; ;
Award ID(s):
Publication Date:
NSF-PAR ID:
10380162
Journal Name:
Journal of Cosmology and Astroparticle Physics
Volume:
2022
Issue:
11
Page Range or eLocation-ID:
014
ISSN:
1475-7516
We report on a search for electron antineutrinos ($ν¯e$) from astrophysical sources in the neutrino energy range 8.3–30.8 MeV with the KamLAND detector. In an exposure of 6.72 kton-year of the liquid scintillator, we observe 18 candidate events via the inverse beta decay reaction. Although there is a large background uncertainty from neutral current atmospheric neutrino interactions, we find no significant excess over background model predictions. Assuming several supernova relic neutrino spectra, we give upper flux limits of 60–110 cm−2s−1(90% confidence level, CL) in the analysis range and present a model-independent flux. We also set limits on the annihilation rates for light dark matter pairs to neutrino pairs. These data improve on the upper probability limit of8B solar neutrinos converting into$ν¯e$,$Pνe→ν¯e<3.5×10−5$(90% CL) assuming an undistorted$ν¯e$shape. This corresponds to a solar$ν¯e$flux of 60 cm−2s−1(90% CL) in the analysis energy range.
3. A bstract We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the DM to undergo thermal freeze-out, we find out relic density allowed parameter space in terms of DM mass ( m χ ) and New Physics (NP) scale (Λ) with one loop direct search constraints from XENON1T experiment. Allowed parameter space of the model is probed at the proposed International Linear Collider (ILC) via monophoton signal for both Dirac and Majorana cases, limited by the centre-of-mass energy $$\sqrt{s}$$ s =1 TeV, where DM mass can be probed within $${m}_{\chi }<\frac{\sqrt{s}}{2}$$ m χ < s 2 for the pair production to occur and Λ > $$\sqrt{s}$$ s for the validity of EFT framework.
Abstract The Deep Underground Neutrino Experiment (DUNE), a 40-kton underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of neutrinos. The general capabilities of DUNE for neutrino detection in the relevant few- to few-tens-of-MeV neutrino energy range will be described. As an example, DUNE’s ability to constrain the $$\nu _e$$ ν e spectral parameters of the neutrino burst will be considered.