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SUMMARY:Neutrino Beacons: Constraining New Physics with Cosmic Messengers
DTSTART;VALUE=DATE-TIME:20260612T030000Z
DTEND;VALUE=DATE-TIME:20260612T040000Z
DTSTAMP;VALUE=DATE-TIME:20260621T203400Z
UID:indico-event-5101@indico-tdli.sjtu.edu.cn
CONTACT:hlqu@sjtu.edu.cn\;15201476686
DESCRIPTION:Speakers: Shivasankar K.A (Hokkaido University\, Japan.)\n\nSe
 minar abstract: The origin of tiny neutrino masses remains an open questi
 on and a strong motivation for physics beyond the Standard Model. In this 
 talk\, I discuss a simple U(1) gauge extension where neutrino masses arise
  through a seesaw mechanism with three right-handed Majorana neutrinos. Af
 ter symmetry breaking\, the model is anomaly-free and predicts a new neutr
 al gauge boson\, Z'\, with chiral couplings to Standard Model fermions. I
  focus on how Z' mediated neutrino interactions can play a role in extreme
  astrophysical environments. In particular\, I study the process （p）
 （p）$\\to e^+ e^-$ as a possible source of energy deposition in very en
 ergetic transients\, such as the gamma-ray burst GRB 221009A. Estimating t
 hese rates in different backgrounds allows us to place constraints on the 
 gauge coupling and the Z' mass. Additional constraints come from neutrino
 –dark matter scattering through Z'\, using high-energy neutrino observat
 ions from sources like TXS 0506+056 and NGC 1068\, together with cosmologi
 cal inputs from the cosmic microwave background and Lyman-α data. I will
  highlight how these astrophysical and cosmological probes complement labo
 ratory searches\, including scattering experiments\, beam-dump facilities\
 , and anomalous magnetic moment measurements. Overall\, this provides a un
 ified multi-messenger picture for testing new neutrino interactions and ex
 ploring the viable parameter space of chiral Z' models. Short bio/introdu
 ction of speaker: Shivasankar is a second-year PhD student at Hokkaido 
 University\, Japan. His research focuses on theoretical particle physics\,
  with particular emphasis on neutrinos and physics beyond the Standard Mod
 el in astrophysical environments. He is also interested in AI for science 
 where he explores the physical representations learned by deep learning mo
 dels and how these can be leveraged to enhance scientific discovery in phy
 sics. In this talk\, he will discuss how diverse astrophysical sources can
  serve as powerful laboratories for probing new physics beyond the Standar
 d Model.Online link: https://meeting.tencent.com/dm/iWy8GU1eNXAW       
       Meeting ID: 787700190     Password:166774  \n\nhttps://indico-
 tdli.sjtu.edu.cn/event/5101/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5101/
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