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Emergence of time in Loop Quantum Gravity

Brahma, Suddhasattwa (2017) Emergence of time in Loop Quantum Gravity. In: UNSPECIFIED.

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Abstract

Loop quantum gravity has formalized a robust scheme in resolving classical singularities in a variety of
symmetry-reduced models of gravity. In this essay, we demonstrate that the same quantum correction which is crucial for singularity resolution is also responsible for the phenomenon of signature change in these models, whereby one effectively transitions from a 'fuzzy' Euclidean space to a Lorentzian space-time in deep quantum regimes. As long as one uses a quantization scheme which respects covariance, holonomy corrections from loop quantum gravity generically leads to non-singular signature change, thereby giving an emergent notion of time in the theory. Robustness of this mechanism is established by comparison across large class of midisuperspace models and allowing for diverse quantization ambiguities. Conceptual and mathematical consequences of such an underlying quantum-deformed space-time are briefly discussed.


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Item Type: Conference or Workshop Item (UNSPECIFIED)
Creators:
CreatorsEmailORCID
Brahma, Suddhasattwasuddhasattwa.brahma@gmail.com
Keywords: Loop quantum gravity, signature-change, singularity-resolution, deformed covariance
Subjects: Specific Sciences > Physics > Quantum Gravity
Specific Sciences > Physics > Relativity Theory
Specific Sciences > Physics > Symmetries/Invariances
Depositing User: Dr. Suddhasattwa Brahma
Date Deposited: 26 Jun 2017 13:24
Last Modified: 26 Jun 2017 13:24
Item ID: 13158
Subjects: Specific Sciences > Physics > Quantum Gravity
Specific Sciences > Physics > Relativity Theory
Specific Sciences > Physics > Symmetries/Invariances
Date: 26 June 2017
URI: https://philsci-archive-dev.library.pitt.edu/id/eprint/13158

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