Gibbsing spacetime: a group field theory approach to equilibrium in quantum gravity

Haggard, Hal M.

doi:10.1088/1367-2630/aad1ac

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…So too is the thermodynamical characterisation, compared with the others outlined above, as will be exemplified in the following. It is thus a new proposal for background independent equilibrium [14,25], which has the potential of incorporating also the others as special cases, from the point of view of constructing a Gibbs state. Consider a macroscopic system with a large number of constituent microscopic degrees of freedom.…”

Section: Thermodynamical Characterisationmentioning

confidence: 99%

Thermal Quantum Spacetime

Kotecha

2019

Universe

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The intersection of thermodynamics, quantum theory and gravity has revealed many profound insights, all the while posing new puzzles. In this article, we discuss an extension of equilibrium statistical mechanics and thermodynamics potentially compatible with a key feature of general relativity, background independence; and we subsequently use it in a candidate quantum gravity system, thus providing a preliminary formulation of a thermal quantum spacetime. Specifically, we emphasise on an information-theoretic characterisation of generalised Gibbs equilibrium that is shown to be particularly suited to background independent settings, and in which the status of entropy is elevated to being more fundamental than energy. We also shed light on its intimate connections with the thermal time hypothesis. Based on this we outline a framework for statistical mechanics of quantum gravity degrees of freedom of combinatorial and algebraic type, and apply it in several examples. In particular, we provide a quantum statistical basis for the origin of covariant group field theories, shown to arise as effective statistical field theories of the underlying quanta of space in a certain class of generalised Gibbs states. CONTENTS

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Section: Thermodynamical Characterisationmentioning

confidence: 99%

Thermal Quantum Spacetime

Kotecha

2019

Universe

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Generalised Statistical Equilibrium

Kotecha

2022

On Generalised Statistical Equilibrium and Discrete Quantum Gravity

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The end of space–time

Faizal

2023

Int. J. Mod. Phys. A

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We will highlight that despite there being various approaches to quantum gravity, there are universal approach-independent features of quantum gravity. The geometry of space–time becomes an emergent structure, which emerges from some purely quantum gravitational degrees of freedom. We argue that these quantum gravitational degrees of freedom can be best understood using quantum information theory. Various approaches to quantum gravity seem to suggest that quantum gravity could be a third quantized theory, and such a theory would not be defined in space–time, but rather in an abstract configuration space of fields. This supports the view that space–time geometry is not fundamental, thus effectively ending the space–time description of nature.

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Gibbsing spacetime: a group field theory approach to equilibrium in quantum gravity

Cited by 3 publications

References 8 publications

Thermal Quantum Spacetime

Thermal Quantum Spacetime

Generalised Statistical Equilibrium

The end of space–time

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