【07.27】Seminar：Neutrino-antineutrino pair production from potential gradient and neutron stars
Seminar
报告题目：Neutrino-antineutrino pair production from potential gradient and neutron stars
报告人：王一琨，博士后，Johns Hopkins University
主持人：李英英，副研究员，中国科学院高能物理研究所
报告时间：2026年7月27日（周一），下午15:00
报告地点：高能所图书馆楼319
报告摘要：
In this talk, I will discuss a particle-antiparticle pair production mechanism under the category of Schwinger effect. In the presence of a strong, supercritical, potential, particles and antiparticles can be pair produced from the vacuum. This has been studied for gauge fields, such as QED, QCD, and gravitation fields. We point out that the pair production could be sourced by a broader category of potentials, provided vector or chiral vector couplings to fermions.
As an example, we show that neutrino-antineutrino can be pair produced under a strong matter potential. The supercritical condition requires that the matter potential to be greater than the neutrino mass, which can be realized in dense objects such as neutron stars. Additionally, a sizable pair production rate requires the potential to have a large gradient, which is featured in neutron stars with density discontinuity associated with a first order nuclear-quark phase transition. Provided with necessary conditions, the neutrino-antineutrino pairs are produced at a rate approximately 10^38/s. The produced neutrinos and antineutrinos, either get absorbed or escape the neutron stars, will largely change the thermal history and become observable through the cooling curve of neutron stars.
个人简介：
Yikun Wang is a postdoctoral fellow at Johns Hopkins University. She works in theoretical particle physics, with a focus on beyond the Standard Model physics. Her work spans over multiple directions, including baryogenesis, Higgs physics, dark matter direct-detection, early universe and astrophysics. Yikun Wang receives her PhD at the University of Chicago in 2021. She was a Burke postdoctoral fellow at California Institute of Technology 2021-2024.
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