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  • Studies of Asymptotic Symmetries at Null and Spatial Infinity 
    AKSHAY, KHADSE (2016-05)
    In this thesis we study the relationship between Asymptotic symmetry group of (Asymptotically flat) space-times at Null and Spatial Infinity. We first review the basic framework concerning Null and Spatial Infinity and ...
  • Quantum Fields in de Sitter Space 
    BADHANI, HIMANSHU (2016-05)
    In this thesis we analyze interacting massive scalar fields in de-Sitter space, specifically the issue of infrared divergences which cause the conventional in-out perturbation theory inapplicable. We then review the use ...
  • Soft Gravitons and Structure of Null Infinity in Logarithmically Asymptotic Flat Spacetime 
    DAS, RAIKHIK (2023-05)
    Recent developments in soft theorems and the rise of Celestial Holography have rejuvenated the interest in the asymptotic structure of spacetimes. Bondi, van der Burg, Metzner, and Sachs's work and Ashtekar's notion of ...
  • Classical Observables from Feynman Amplitudes 
    AGGARWAL, AVIRAL (2023-05)
    We study KMOC formalism developed to calculate classical observables from amplitudes in Quantum Field Theory. Amplitudes and S-matrix carry the information of interaction of any scattering process and thus the classically ...

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