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gr-qc2023
Quantum Fields from Causal Order
Abhishek Mathur
We study different aspects of observer independent formulation of quantum field theory (QFT) in curved spacetime background. This thesis is broadly divided into two parts, in the f…
gr-qc2023
Null Geodesics from Ladder Molecules
Anish Bhattacharya, Abhishek Mathur, Sumati Surya
We propose a discrete analogue of null geodesics in causal sets that are approximated by a region of 2d Minkowski spacetime, in the spirit of Kronheimer and Penrose's "grids" and "…
gr-qc2022★ 4 cited
Spacetime Entanglement Entropy: Covariance and Discreteness
Abhishek Mathur, Sumati Surya, Nomaan X
We review some recent results on Sorkin's spacetime formulation of the entanglement entropy (SSEE) for a free quantum scalar field both in the continuum and in manifold-like causal…