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BIMSA General Relativity Seminar
Causal Structure of Singularities Formed in Gravitational Collapse
Causal Structure of Singularities Formed in Gravitational Collapse
演讲者
时间
2024年09月23日 15:30 至 17:00
地点
A3-2-301
线上
Zoom 559 700 6085
(BIMSA)
摘要
In this talk, I will begin by briefly discussing the global causal conditions of spacetime manifolds, the singularity theorem, and the cosmic censorship conjecture. I will then show the possibility of the formation of non-spacelike singularities in both spherical and non-spherical gravitational collapse, employing the Lemaitre-Tolman-Bondi (LTB) and Szekeres metrics to model these scenarios, respectively. Furthermore, I will demonstrate the non-zero probability of non-spacelike singularities arising in the presence of non-zero pressure. Finally, I will discuss some key unresolved issues that must be explored to gain a deeper understanding of the causal structure of singularities in gravitational collapse.
演讲者介绍
Dr. Dipanjan Dey completed his Ph.D. in Physics at the Indian Institute of Technology, Kanpur, India, in 2019, under the supervision of Professor Kaushik Bhattacharya. His doctoral research primarily focused on investigating the gravitational collapse of compact objects across various cosmological scenarios. Following his Ph.D., Dr. Dey joined the International Center for Cosmology at CHARUSAT, India, as a postdoctoral fellow under the guidance of Professor Pankaj S. Joshi. During this postdoctoral tenure, his research centered on the causal structure of singularities formed during the continual gravitational collapse of compact objects, with a particular emphasis on identifying possible physical signatures of non-spacelike singularities. In March 2020, Dr. Dey was appointed as an assistant professor at the International Center for Cosmology, CHARUSAT, India. Throughout his time there, he made significant contributions to academia through research, teaching, and administrative responsibilities. In October 2022, he joined Dalhousie University as an AARMS postdoctoral fellow under the supervision of Professor Alan A. Coley. At Dalhousie, Dr. Dey's work involved studying the causal structure of singularities in a coordinate-independent manner, utilizing the spinor structure of the spacetime manifold in the context of collapsing compact objects.