报告题目:Adiabatic accretion onto black holes in Rastall theory

报告人：Ghulam Abbas 副教授（Islamia University）

报告时间：2023年10月11日（周三）下午 14:00-15:30

报告地点：浙江工业大学理学楼A 二楼师生活动中心

摘 要 (Abstract): We investigate the accretion process onto the charged black hole surrounded by perfect fluid radiation field in Rastall gravity. To determine the analytical solution to problem of stationary, spherically symmetric accretion of a polytropic fluid, we formulated the generalized relations for mass accretion rate $dot{M}$, critical horizon radius and some other flow parameters. Furthermore, using polytropic equation of state, we have investigated the location of critical points, polytropic gas compression ratios and temperature profiles in detail. It has been found that the critical points lies inside the inner horizon of the Rastall gravity black hole. The location of critical points has been compared with case of Schwarzschild black hole in which critical points lies out side the horizon. We have observed that charge Q and Rastall parameter N  have deep effects on the accretion process. The results can be reduced to Schwarzschild black hole and charged black hole cases under some limits.

报告人简介(Bio): Dr. Ghulam Abbas has completed his Ph. D in Applied Mathematics (General Theory of Relativity) from University of the Punjab, Lahore Pakistan in 2013. Currently, he is working as Tenured Associate Professor in the Department of Mathematics, The Islamia University of Bahawalpur Pakistan, also he is post-doctorate fellow of National Astronomical Observatory China (NAOC) Beijing, China during 2023.  He has published his research work in the journals of the international repute. His total publications in the impact factor journal are 150, with the accumulative impact factor 400, these publications have been cited by more than 3000 related articles. His h-index is 30. He has successfully supervised 07 Ph. D Mathematics Thesis and 34 M. S Mathematics Thesis.  Currently, 06 Ph. D students and 09 M. S students are working under his supervision.  He has participated as speaker in 30 national and international conferences and has organized some conferences, seminars and webinars in his university during 2020-2022. During the years 2013, 2015, 2016 Pakistan Council of Science and Technology has awarded him the research productivity award.  He is the in-charge examination and online admission in-charge in his university. He has been granted culture exchange program funding to visit NAOC, Chinse academy of sciences Beijing for 03 months during 2012.  During the years 2020 and 2021, he has been announced (by Stanford University USA) among the world top 2% most cited scientists in his field of research. His parent University awarded him the prominent researcher award in 2022 for publishing the 22 research articles in one year.  

邀请人: 朱涛 教授