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Stellar limits on a light scalar

作者:点击次数:更新时间:2020年11月11日

Abstract: A light CP-even scalar S with mass below GeV-scale exists in may beyond standard model (SM) scenarios. Such a light particle can be produced abundantly in the stars, such as the Sun, red giants, white dwarfs, horizontal-branch stars, neutron star mergers, and supernovae. In this talk I will show the state-of-art stellar limits on S. Assuming the couplings of S to the SM particles are from mixing with the SM Higgs, the production of S will be dominated by nucleon bremsstrahlung process in all the stars. With the decay and reabsorption of S taken into consideration, the stellar luminosities exclude a broad range of the mixing angle, from to , with the scalar mass up to roughly order of 100 MeV. These stellar limits are largely complementary to other laboratory, astrophysical and cosmological limits on S.

报告人简介:张永超博士于2014年在北京大学获得博士学位,在访问中科院理论物理研究所一年之后,张永超博士于2015 – 2017年在布鲁塞尔自由大学(Université Libre de Bruxelles)做博士后,之后于2017 – 2020年在美国圣路易斯华盛顿大学(Washington University in St. Louis)做博士后。张永超博士于今年11月份刚刚受聘为东南大学的副教授。