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Exploring the Weakest and the Strongest Gravity by Twisted Light
November 13, 201910:30 am – 11:30 am (CDT)

Exploring the Weakest and the Strongest Gravity by Twisted Light


Longlong Feng (Sun Yat-sen University, China)



Mitchell Physics Building

College Station, Texas 77843-4242

About The Speaker

Feng Longlong, professor of physics at Sun Yat-sen university. He received his bachelor's degree in physics from the University of Science and Technology of China (USTC) in 1982, and master's degree from Center for Astrophysics of USTC in 1985. He got his PhD degree from Department of Astronomy of Nanjing university in 1990. Since 1990, he had been working in USTC. During this period, He visited and worked in many universities and astrophysical research institutions in Europe and the United States, and got support from Hundred Talents Program of the Chinese Academy of Sciences (CAS) . In 2003, he was transferred to the Purple Mountain Observatory as the principal researcher of galactic astronomy & cosmology group. Since 2014, he moved to Sun Yat-sen university and has been physical professor in School of physics and astronomy. Prof. Feng's research interests include relativistic astrophysics, galactic astronomy and cosmology, computational astrophysics, etc. He has actively promote the study of computational cosmology in China, and initiated and organized the Computational Cosmological Consortium of China. He has made a great effort in developing the hybrid cosmological hydrodynamic/N-body code and is leading to perform several extremely large cosmological simulations in China's self-developed super-computing platform.

Event Details

Black holes and gravitational waves are two important predictions of classical general relativity, and are thus the crucial tests of gravitation theories. In a rotating gravitational field produced by a Kerr black hole, the coupling between the macroscopic rotation of black hole and the angular momentum of photon can not only distort the orbital motion of the photon, and also produces an additional nor-integrable phase, leading to the wavefront distortion of the light coming from near the black hole. On the other hand, it was found that there is a dipole interaction between twisted lights and gravitational waves, which make photos undergoing dipole transitions between different orbital-angular-momentum eigenstates. In this talk, I will discuss these two effects and their astronomical implications, in particular the detection of strongest gravitational fields produced by spinning black holes and the weakest gravitational fields in gravitational waves.

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