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Boundary and Corner Terms in the Action for General Relativity

We revisit the action principle for general relativity motivated by the path integral approach to quantum gravity. We consider a spacetime region whose boundary has piecewise $C^2$ components, each… Expand

37 6- PDF

Directions in Causal Set Quantum Gravity

- S. Surya
- Physics
- 31 March 2011

In the causal set approach to quantum gravity the spacetime continuum arises as an approximation to a fundamentally discrete substructure, the causal set, which is a locally finite partially ordered… Expand

66 4- PDF

Phase transitions for flat anti-de Sitter black holes.

- S. Surya, K. Schleich, D. Witt
- Physics, Medicine
- Physical review letters
- 19 January 2001

We reexamine the thermodynamics of anti-de Sitter (adS) black holes with Ricci flat horizons using the adS soliton as the thermal background. We find that there is a phase transition which is… Expand

79 4- PDF

Quantum Covers in Quantum Measure Theory

- S. Surya, P. Wallden
- Mathematics, Physics
- 11 September 2008

Sorkin’s recent proposal for a realist interpretation of quantum theory, the anhomomorphic logic or coevent approach, is based on the idea of a “quantum measure” on the space of histories. This is a… Expand

34 2- PDF

Spatial hypersurfaces in causal set cosmology

- S. Major, D. Rideout, S. Surya
- Physics
- 29 June 2005

Within the causal set approach to quantum gravity, a discrete analogue of a spacelike region is a set of unrelated elements, or an antichain. In the continuum approximation of the theory, a… Expand

30 2- PDF

Discrete geometry of a small causal diamond

- Mriganko Roy, D. Sinha, S. Surya
- Physics
- 4 December 2012

We study the discrete causal set geometry of a small causal diamond in a curved spacetime using the average abundance hCkiof k-element chains or total orders in the underlying causal set C. We begin… Expand

17 2- PDF

On extending the Quantum Measure

- Fay Dowker, Steven C. Johnston, S. Surya
- Physics, Mathematics
- 16 July 2010

We point out that a quantum system with a strongly positive quantum measure or decoherence functional gives rise to a vector-valued measure whose domain is the algebra of events or physical… Expand

27 2- PDF

A result in 2d causal set theory: the emergence of spacetime

- G. Brightwell, J. Henson, S. Surya
- Mathematics
- 1 June 2009

A 2d model of causal set quantum gravity is constructed using a continuum-inspired dynamics. Apart from a restriction to causal set dimension and topology, the model is fully dynamical and includes… Expand

5 2

AN ANALYSIS OF THE REPRESENTATIONS OF THE MAPPING CLASS GROUP OF A MULTIGEON THREE-MANIFOLD

It is known that the distinct unitary irreducible representations (UIR's) of the mapping class group G of a three-manifold ℳ give rise to distinct quantum sectors ("θ sectors") in quantum theories of… Expand

18 2- PDF

Evidence for the continuum in 2D causal set quantum gravity

- S. Surya
- Physics
- 28 October 2011

We present evidence for a continuum phase in a theory of 2D causal set quantum gravity which contains a dimensionless non-locality parameter ∈ (0, 1]. We also find a phase transition between this… Expand

27 1- PDF

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