Axial perturbations in Kantowski-Sachs spacetimes and hybrid quantum cosmology
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909228495536128 |
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| author | Marugán, Guillermo A. Mena Mínguez-Sánchez, Andrés |
| author_facet | Marugán, Guillermo A. Mena Mínguez-Sánchez, Andrés |
| contents | Recently, there has been a growing interest in investigating homogeneous but anisotropic spacetimes owing to their relation with nonrotating, uncharged black hole interiors. We present a description of axial perturbations for a massless scalar field minimally coupled to this geometry. We truncate the action at the quadratic perturbative order and tailor our analysis to compact spatial sections. Perturbations are described in terms of perturbative gauge invariants, linear perturbative constraints, and their canonically conjugate variables. The entire set, encompassing perturbations and homogeneous degrees of freedom, is consolidated into a canonical one. We employ a hybrid approach to quantize this system, integrating a quantum representation of the homogeneous sector using Loop Quantum Cosmology techniques with a conventional field quantization of the perturbations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_08307 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Axial perturbations in Kantowski-Sachs spacetimes and hybrid quantum cosmology Marugán, Guillermo A. Mena Mínguez-Sánchez, Andrés General Relativity and Quantum Cosmology Recently, there has been a growing interest in investigating homogeneous but anisotropic spacetimes owing to their relation with nonrotating, uncharged black hole interiors. We present a description of axial perturbations for a massless scalar field minimally coupled to this geometry. We truncate the action at the quadratic perturbative order and tailor our analysis to compact spatial sections. Perturbations are described in terms of perturbative gauge invariants, linear perturbative constraints, and their canonically conjugate variables. The entire set, encompassing perturbations and homogeneous degrees of freedom, is consolidated into a canonical one. We employ a hybrid approach to quantize this system, integrating a quantum representation of the homogeneous sector using Loop Quantum Cosmology techniques with a conventional field quantization of the perturbations. |
| title | Axial perturbations in Kantowski-Sachs spacetimes and hybrid quantum cosmology |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2402.08307 |