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Abstract：
Neutron star (NS) mergers are one of the leading objects for multimessenger astronomy, from which we can expect both gravitational wave and electromagnetic signals. As an explicit example, the NS merger event GW170817 is used to constrain the axion-like particles (ALPs), assuming ALP couples only to photons. Produced via the Primakoff and photon fusion processes, ALPs escape from the stars and decay subsequently into two photons. Then the X-ray and gamma-ray observations following the GW170817 signal, e.g. those by Fermi-LAT, can be used to set limits on the ALP mass and coupling. Such limits are largely complementary to other laboratory, supernova and cosmological limits, and can be further improved in future observations.
Biography:
Dr. Yongchao Zhang, Professor at Southeast University, got his Ph.D. from Peking University in 2014. He was once a visiting scholar at the University of Maryland in the USA and Institute of Theoretical Physics, Chinese Academy of Sciences, and a postdoctor at the Université Libre de Bruxelles in Belgium and the Washington University in St. Louis in the USA. He is mainly interested in beyond standard model phenomenology and relevant astrophysics and cosmology, such as neutrino physics, axion physics, and the interplay of particle physics and supernovae and neutron stars etc.
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