报告题目：From Loop Quantum Cosmology to Loop Quantum Black Holes

报  告 人：Prof. Anzhong Wang，Baylor University (USA)

研究方向：引力与宇宙学

报告时间：2024年12月26日（星期四）下午16:00

报告地点：量子楼410报告厅

报告摘要：

General relativity (GR) has achieved great successes since its incarnation in 1915, ranging from astrophysics to cosmology. However, it also faces several challenges due to the divergence of curvatures at Big Bang (BB) and black hole (BH) singularities. At these places, quantum gravitational effects are expected to be strong. In fact, it is the general belief that such corrections are so strong that they will dominate the physics, whereby the singularities are smoothed out and physics becomes predictable.

In loop quantum cosmology (LQC), the big bang singularity is resolved, which is closely related to the fact that the area operator has a minimal and non-zero area gap after quantization of the spatial geometry. Due to these quantum geometric corrections, the BB singularity is replaced by a quantum bounce. The resultant LQC is consistent with all cosmological observations and could also explain some anomalies in recent cosmic microwave background observations.

When applying the techniques of LQC to BHs, several issues raise, and so far the studies of loop quantum BHs have not been as successful as those of LQC. In this talk, I shall first give a brief review of LQC and then state clearly the obstacles that we have been facing when applying the techniques of LQC to BHs, and finally discuss some possibilities to overcome these problems.

报告人简介：

• Dr. Anzhong Wang received his bachelor and master degrees in physics from Shandong Normal University at Liaocheng (1983), and Northeast Normal University (1986) in China.

• In 1991, he received his Ph.D. degree from Ioannina University, Greece, on ``non-linear interaction of gravitational waves,” which in 2020 was published as a research monograph by World Scientific (World Scientific, New Jersey, 2022, ISBN 978-981-121-148-5).

• Between 1992 – 2003, he worked at Sao Paulo State University at Campinas, Brazilian National Observatory, and the State University of Rio de Janeiro, as an assistant, associate and full professor, respectively.

• In 2003, he joined Physics Department, Baylor University, and has been working there since then as a tenured full professor, and the director of the Division of Gravity, Cosmology and Astroparticle Physics (GCAP), Baylor University.

• He has been working on both classical and quantum gravity and their applications to astrophysics and cosmology. He has published about 300 articles with about 11,000 citations and the H-Index 54. He is one of the 2% top-cited world scientists over all science fields, according to recent Stanford University releases.

• He has supervised about 18 Ph.D. students, 19 postdocs, and a dozen of master and undergraduate students. He was awarded the Baylor Outstanding Faculty in Research in 2009.

• Currently, he is working on gravitational waves, black holes, loop quantum gravity, and its applications to astrophysics and cosmology. His research is supported by NSF of USA.