Question What is a Neutrino?

[Harry Costas]

The importance of Neutrinos is becoming one of the points researched by scientists.

[Submitted on 18 Jun 2025]

Shimmering Darkness: Mapping the Evolution of Supernova-Neutrino-Boosted Dark Matter within the Milky Way​

Yen-Hsun Lin, Meng-Ru Wu

Supernova-neutrino-boosted dark matter (SNν BDM) has emerged as a promising portal for probing sub-GeV dark matter. In this work, we investigate the behavior of BDM signatures originating from core-collapse supernovae (CCSNe) within the Milky Way (MW) over the past one hundred thousand years, examining both their temporal evolution and present-day spatial distributions. We show that while the MW BDM signature is approximately diffuse in the nonrelativistic regime, it exhibits significant temporal variation and spatial localization when the BDM is relativistic. Importantly, we compare these local MW signatures with the previously proposed diffuse SNν BDM (DBDM), which arises from the accumulated flux of all past SNe in the Universe [Y.-H. Lin and M.-R. Wu, Phys. Rev. Lett. 133, 111004 (2024)]. In the nonrelativistic limit, DBDM consistently dominates over the local diffuse MW BDM signature. Only when the MW BDM becomes ultrarelativistic and transitions into a transient, highly-localized signal, it can potentially surpass the DBDM background. This work thus reinforces the importance of DBDM for SNν BDM searches until the next galactic SN offers new opportunities.

 

[Harry Costas]

[Submitted on 18 Jun 2025]

Supernova-Boosted Dark Matter at Large-Volume Neutrino Detectors​

Badal Bhalla, Fazlollah Hajkarim, Doojin Kim, Kuver Sinha

Core-collapse supernovae, among the universe's most energetic events, offer a novel window into the dark sector by potentially producing a flux of boosted dark matter (BDM). We explore the potential to detect the BDM produced by supernovae with a focus on fermionic dark matter that interacts with the visible sector through a dark gauge boson. We consider the expected BDM flux at Earth, originating from both the diffuse background of all galactic supernovae and potentially strong signals from individual nearby events. Focusing on BDM-electron scattering, we project the sensitivity of major current and future large-volume neutrino detectors - DUNE, Hyper-Kamiokande, and JUNO - to this elusive signal. Our results indicate that these experiments can significantly constrain or discover BDM within compelling parameter spaces, with sensitivity notably enhanced during nearby supernova occurrences. We further emphasize the unique multi-messenger opportunity presented by a galactic supernova, where the characteristic time delay between the neutrino burst and the BDM signal arrival could provide powerful evidence and enable probes of dark matter properties.

 

[jhixon]

Neutrinos actually works like this; matter is held together by electrons and the proton contains 2 up charms and 1 down. Antimatter is held together by neutrinos and the antiproton contains 2 down charms and 1 up charm. Matter has electrons in the outer orbit, so when neutrinos come close they pass through matter because the "Law of Charges" says that a negative energy (electrons) and negative energy (neutrinos) repel each other thus neutrinos don't bond with any matter and pass right through. They are researching them because they do not understand how neutrinos work in our universe. Hope this helps..