PIRSA:24020038

Horizons and Null Infinity: A Fugue in 4 voices

Ashtekar, A. (2024). Horizons and Null Infinity: A Fugue in 4 voices. Perimeter Institute. https://pirsa.org/24020038

Ashtekar, Abhay. Horizons and Null Infinity: A Fugue in 4 voices. Perimeter Institute, Feb. 14, 2024, https://pirsa.org/24020038 

          @misc{ pirsa_PIRSA:24020038,
            doi = {10.48660/24020038},
            url = {https://pirsa.org/24020038},
            author = {Ashtekar, Abhay},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Horizons and Null Infinity: A Fugue in 4 voices},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {feb},
            note = {PIRSA:24020038 see, \url{https://pirsa.org}}
          }

Abhay Ashtekar

Pennsylvania State University

Talk number
PIRSA:24020038
Collection
Talk Type
Subject
Abstract

Horizons of black holes in equilibrium and null infinity of asymptotically flat space-times are null 3-manifolds but have very different physical connotations. We first show that they share a large number of geometric properties, making them both weakly isolated horizons. We then use this new unified perspective to unravel the origin of the drastic differences in the physics they contain. Interestingly, the themes are woven together in a manner reminiscent of voices in a fugue.The talk is based on joint work with Simone Speziale (arXiv:2401.15618 and arXiv 2401:????).

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