BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:Particle Physics Seminar - Dr. Yikun Wang
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260513T223956Z
UID:tag:localist.com\,2008:EventInstance_52365211139681
DTSTART:20260319T180000Z
DTEND:20260319T190000Z
DESCRIPTION:"Neutrino-antineutrino pair production from potential gradient"
 \n\n \n\nPresented by Dr. Yikun Wang\, Postdoctoral Fellow\, Johns Hopkins
  University\n\n \n\nIn this talk\, I will discuss a particle-antiparticle 
 pair production mechanism under the category of Schwinger effect. In the p
 resence of a strong\, supercritical\, potential\, particles and antipartic
 les can be pair produced from the vacuum. This has been widely studied for
  gauge fields\, both in QED and QCD\, and gravitation fields\, relevant fo
 r black hole physics. We argue that the pair production could be sourced b
 y alternative potentials\, provided vector or chiral vector couplings to f
 ermions. \n\n \n\nAs an example\, we show that neutrino-antineutrino can b
 e pair produced under a strong matter potential. The supercritical conditi
 on requires that the matter potential to be greater than the neutrino mass
 \, which can be realized in dense objects such as neutron stars. Additiona
 lly\, a sizable pair production rate requires the potential to have a larg
 e gradient\, such as a steep slope\, or a narrow width for a step-like pot
 ential. The latter can be achieved in neutron stars provided discontinuity
  in its density profile\, that can present as a result of phase transition
 s in neutron star. Provided with necessary conditions\, the neutrino-antin
 eutrino could be produced at a sizable rate comparable to other emission m
 echanisms. With the core temperature greater than the neutrino kinetic ene
 rgy\, this opens up a new channel for neutron star cooling. After escaping
  the neutron star\, these neutrinos and antineutrinos\, with energy much g
 reater than cosmic neutrino backgrounds\, can potentially be detected in d
 irect detection experiments.
GEO:39.681038;-75.752869
LOCATION:Sharp Lab\, 215
SUMMARY:Particle Physics Seminar - Dr. Yikun Wang
URL;VALUE=URI:https://events.udel.edu/event/particle-physics-seminar-dr-yik
 un-wang
CATEGORIES:Academics
CATEGORIES:Faculty & Staff
CATEGORIES:Grad Students & Postdocs
END:VEVENT
END:VCALENDAR