Archived weekly pre-prints 23-03-13

Authors: Giampiero Esposito
Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Arxiv link: https://arxiv.org/abs/2303.05430
Abstract DeWitt’s suggestion that the wave function of the universe should vanish at the classical big-bang singularity is here considered within the framework of one-loop quantum cosmology. For pure gravity at one loop about a flat four-dimensional background bounded by a 3-sphere, three choices of boundary conditions are considered: vanishing of the linearized magnetic curvature when only transverse-traceless gravitational modes are quantized; a one-parameter family of mixed boundary conditions for gravitational and ghost modes; diffeomorphism invariant boundary conditions for metric perturbations and ghost modes. A positive zeta(0) value in these cases ensures that, when the 3-sphere boundary approaches zero, the resulting one-loop wave function approaches zero. This property may be interpreted by saying that, in the limit of small three-geometry, the resulting one-loop wave function describes a singularity-free universe. This property holds for one-loop functional integrals, which are not necessarily equivalent to solutions of the quantum constraint equations.

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[2303.05042] - Aspects of Quantum Gravity Phenomenology and Astrophysics - Arundhati Dasgupta, José Fajardo-Montenegro

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[2303.04162] - Quantum gravity constraints on scale separation and de Sitter in five dimensions - Niccolò Cribiori, Carmine Montella

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[2303.03562] - Semiclassical instability of inner-extremal regular black holes - Tyler McMaken
[2303.03931] - A regular black hole as the final state of evolution of a singular black hole - Han-Wen Hu, Chen Lan, Yan-Gang Miao
[2303.04049] - A Mirzakhani recursion for non-orientable surfaces - Douglas Stanford
[2303.04082] - Exact flow equation for the divergence functional - Stefan Floerchinger

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[2303.02953] - A possible solution to the Hubble tension from quantum gravity - Anupama B, P K Suresh
[2303.02728] - Symmetries of $κ$ Minkowski space-time: A possibility of exotic momentum space geometry? - Partha Nandi, Anwesha Chakraborty, Sayan Kumar Pal, Biswajit Chakraborty, Frederik G Scholtz
[2303.02752] - Quantum complexity and bulk timelike singularities - Gaurav Katoch, Jie Ren, Shubho R. Roy
[2303.02837] - Algebras, Regions, and Observers - Edward Witten

Authors: Nobuhito Maru, Hiroki Tanaka
Subjects: High Energy Physics - Theory (hep-th); High Energy Physics - Phenomenology (hep-ph)
Arxiv link: https://arxiv.org/abs/2303.01747
Abstract In a torus compactification with magnetic flux, the scalar field generated from the higher dimensional gauge field becomes the Nambu-Goldstone boson of the translational symmetry in extra spaces and the mass of the scalar field is not allowed. In this paper, we explicitly show that the one-loop quantum correction to the mass of the scalar field is generated at fixed points in a case of an orbifold compactification $T^2/Z_2$ with magnetic flux. This is because the scalar field is a pseudo Nambu-Goldstone boson as a result of explicit breaking of the translational symmetry by the fixed points. This result might be possible to shed a new light on the solution of the hierarchy problem.

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[2303.01987] - Quasinormal modes of renormalization group improved Dymnikova regular black holes - R. A. Konoplya, Z. Stuchlik, A. Zhidenko, A. F. Zinhailo