Coherent states of quantum spacetimes for black holes and de Sitter spacetime

• URL: http://arxiv.org/abs/2312.06628v1
• Date: Thu, 7 Dec 2023 19:54:15 GMT
• Title: Coherent states of quantum spacetimes for black holes and de Sitter spacetime
• Authors: Diego J. Cirilo-Lombardo (Keldysh Institute of the Russian Academy of Sciences and CONICET-UBA-INFINA), and Norma G. Sanchez (CNRS and The Chalonge - Hector de Vega International School of Astrophysics)
• Abstract summary: We provide a group theory approach to coherent states describing quantum space-time and its properties. This provides a relativistic framework for the metric of a Riemmanian space with bosonic and fermionic coordinates.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We provide a group theory approach to coherent states describing quantum space-time and its properties. This provides a relativistic framework for the metric of a Riemmanian space with bosonic and fermionic coordinates, its continuum and discrete states, and a kind of {\it"quantum optics"} for the space-time. {\bf New} results of this paper are: (i) The space-time is described as a physical coherent state of the complete covering of the SL(2C) group, eg the Metaplectic group Mp(n). (ii) (The discrete structure arises from its two irreducible: $\textit{even}$ $(2n)$ and $\textit{odd}$ $(2n\;+\;1)\;$ representations, ($n = 1,\, 2, \,3\,...$ ), spanning the complete Hilbert space $\mathcal{H} = \mathcal{H}_{odd}\oplus \mathcal{H}_{even}$. Such a global or {\it complete} covering guarantees the CPT symmetry and unitarity. Large $n$ yields the classical and continuum manifold, as it must be. (iii) The coherent and squeezed states and Wigner functions of quantum-space-time for black holes and de Sitter, and (iv) for the quantum space-imaginary time (instantons), black holes in particular. They encompass the semiclassical space-time behaviour plus high quantum phase oscillations, and notably account for the classical-quantum gravity duality and trans-Planckian domain. The Planck scale consistently corresponds to the coherent state eigenvalue $\alpha = 0$ (and to the $n = 0$ level in the discrete representation). It is remarkable the power of coherent states in describing both continuum and discrete space-time. The quantum space-time description is {\it regular}, there is no any space-time singularity here, as it must be.

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