21 citations · 55 across the 6 of their papers we have counts for
6 papers
Motivating semiclassical gravity: a classical-quantum approximation for bipartite quantum systems
Viqar Husain, Irfan Javed, Sanjeev S. Seahra +1
We derive a "classical-quantum" approximation scheme for a broad class of bipartite quantum systems from fully quantum dynamics. In this approximation, one subsystem evolves via cl…
Spacetime Entanglement Entropy of de Sitter and Black Hole Horizons
Abhishek Mathur, Sumati Surya, Nomaan X
We calculate Sorkin's manifestly covariant entanglement entropy for a massive and massless minimally coupled free Gaussian scalar field for the de Sitter horizon and…
Entanglement Entropy of Causal Set de Sitter Horizons
Sumati Surya, Nomaan X, Yasaman K. Yazdi
de Sitter cosmological horizons are known to exhibit thermodynamic properties similar to black hole horizons. In this work we study causal set de Sitter horizons, using Sorkin's sp…
Manifold Properties from Causal Sets using Chains
Joachim Kambor, Nomaan X
We study the utility of chains defined on causal sets in estimating continuum properties like the curvature, the proper time and the spacetime dimension through a numerical analysi…
Studies on the SJ Vacuum in de Sitter Spacetime
Sumati Surya, Nomaan X, Yasaman K. Yazdi
In this work we study the Sorkin-Johnston (SJ) vacuum in de Sitter spacetime for free scalar field theory. For the massless theory we find that the SJ vacuum can neither be obtaine…
Scalar Field Green Functions on Causal Sets
Nomaan X, Fay Dowker, Sumati Surya
We examine the validity and scope of Johnston's models for scalar field retarded Green functions on causal sets in 2 and 4 dimensions. As in the continuum, the massive Green functi…