| Weekly Seminars for September 2019 |
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Thursday September 12th,
2019 - h 11:00
ICRANet Pescara (Meeting room, 1st Floor)
ICRANet Seminar
Speaker: Prof. Sang Pyo Kim
Institutions: Department of Physics, Kunsan National University, Kunsan 54150, Korea Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China Title: Magnetars, Magnetized Black Holes and Laboratory Astrophysics​
Abstract:
Neutron stars, in particular, magnetars (highly magnetized neutron stars) provide the most intense magnetic fields in the universe, which go by order of two or more beyond the critical field. The vacuum birefringence, a vacuum polarization effect, was predicted and has recently been observed by measuring optical spectrum from a neutron star. Damour and Ruffini studied the Schwinger mechanism in KN black holes and discussed a possibility of astrophysical source for GRBs. Blanford and Znajek proposed a central mechanism for gamma rays bursts (GRBs), in which magnetized rotating black holes power jets by mining the rotational energy through magnetic fields. Ruffini et al further proposed the dyadophere and dyadotorus model of charged black holes, and recently studied the effects of Wald’s type magnetic fields on GRBs in rotating black holes. In this talk, magnetized black holes are reviewed and possibility of black hole solutions with localized magnetic fields beyond Wald, Dokuchaev, and Gibbons et al is discussed. Then QED physics in strong magnetic fields with/without electric fields are explained, and QED effects in neutron stars, magnetars and magnetized black holes are suggested. Finally, laboratory astrophysics is proposed using ultra-intense lasers, in which a strong gravity is emulated by Unruh effect of accelerating electrons or charges, and strong electromagnetic fields are provided by the lasers.
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