Video URL

https://pirsa.org/16030127

Variational Principle for Gravity with Null Boundaries

Parattu, K. (2016). Variational Principle for Gravity with Null Boundaries. Perimeter Institute for Theoretical Physics. https://pirsa.org/16030127

Parattu, Krishnamohan. Variational Principle for Gravity with Null Boundaries. Perimeter Institute for Theoretical Physics, Mar. 17, 2016, https://pirsa.org/16030127 

          @misc{ scivideos_PIRSA:16030127,
            doi = {10.48660/16030127},
            url = {https://pirsa.org/16030127},
            author = {Parattu, Krishnamohan},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Variational Principle for Gravity with Null Boundaries},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {mar},
            note = {PIRSA:16030127 see, \url{https://scivideos.org/index.php/pirsa/16030127}}
          }

Krishnamohan Parattu Chennai Mathematical Institute

DOI 10.48660/16030127
Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The fact that the Einstein-Hilbert action, by itself, does not lead to a well-posed variational principle has become textbook knowledge. It can be made well-posed by the addition of suitable boundary terms. There are many boundary terms available in the literature, of which the most famous and most widely used is the Gibbons-Hawking-York (GHY) boundary term. The GHY term is ostensibly defined only for a non-null boundary. There have been very few efforts in the literature to extend its definition to null boundaries. The speaker will present his group's work towards finding a boundary term to render the Einstein-Hilbert action well-posed in the presence of null boundaries. He shall discuss a proposed boundary term, associated boundary conditions, outstanding issues and possible applications.