“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 15659
School of Particles and Accelerator
  Title:   Stress tensor on null boundaries
  Author(s):  Ghadir Jafari
  Status:   Published
  Journal: Phys. Rev. D
  No.:  104035
  Vol.:  99
  Year:  2019
  Supported by:  IPM
Using the Brown-York prescription for the definition of quasilocal gravitational energy-momentum tensoron a boundary and also complete canonical structure on a null boundary which has been found recently[Classical Quantum Gravity36, 015012 (2019)], we propose a similar stress tensor on the null boundary. Thenwe exploit this stress tensor to compute the quasilocal energy and angular momentum for some well-knowngravitational solutions. We have found that in addition to reference spacetime method for regularizing totalenergy,inthecaseofnullboundarywecan add apossiblecountertermthereby avoidingembedding difficulties.

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