Archived weekly pre-print 21-12-27

Authors: Luca Marchetti, Daniele Oriti
Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
Arxiv link: https://arxiv.org/abs/2112.12677
Abstract We derive an effective dynamics for scalar cosmological perturbations from quantum gravity, in the framework of group field theory (GFT) condensate cosmology. The emergent spacetime picture is obtained from the mean field hydrodynamic regime of the fundamental theory, and physical observables are defined using a relational strategy applied at the same level of approximation, in terms of suitable collective states of the GFT field. The dynamical equations we obtain for volume and matter perturbations lead to the same solutions as those of classical general relativity in the long-wavelength, super-horizon limit, but differ in other regimes. These differences could be of phenomenological interest and make contact between fundamental quantum gravity models and cosmological observations, indicating new physics or limitations of the fundamental models or of the approximations leading to the effective cosmological dynamics.

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[2112.12235] - Quantum Gravity at Low Energies - David Wallace
[2112.12156] - Emergent times in holographic duality - Samuel Leutheusser, Hong Liu
[2112.12198] - Engineering holographic flat fermionic bands - Nicolás Grandi, Vladimir Juričić, Ignacio Salazar Landea, Rodrigo Soto-Garrido

Authors: Asier Alonso-Bardaji, David Brizuela, Raül Vera
Subjects: General Relativity and Quantum Cosmology (gr-qc)
Arxiv link: https://arxiv.org/abs/2112.12110
Abstract We present an effective theory to describe the quantization of spherically symmetric vacuum in loop quantum gravity. We include anomaly-free holonomy corrections through a canonical transformation of the Hamiltonian of general relativity, such that the modified constraint algebra closes. The system is then provided with a fully covariant and unambigous geometric description, independent of the gauge choice on the phase space. The resulting spacetime corresponds to a singularity-free (black-hole/white-hole) interior and two asymptotically flat exterior regions of equal mass. The interior region contains a minimal smooth spacelike surface that replaces the Schwarzschild singularity. We find the global causal structure and the maximal analytical extension. Both Minkowski and Schwarzschild spacetimes are directly recovered as particular limits of the model.

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[2112.11467] - The Desert and the Swampland - Cody Long, Miguel Montero, Cumrun Vafa, Irene Valenzuela
[2112.11614] - Why Does Quantum Field Theory In Curved Spacetime Make Sense? And What Happens To The Algebra of Observables In The Thermodynamic Limit? - Edward Witten
[2112.12025] - Homogeneous Yang-Baxter deformations as undeformed yet twisted models - Riccardo Borsato, Sibylle Driezen, J. Luis Miramontes

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[2112.11332] - Tunneling Analysis Under the Influences of Einstein-Gauss-Bonnet Black Holes Gravity Theory - Riasat Ali, Muhammad Asgher
[2112.10783] - Quintessence and the Swampland: The numerically controlled regime of moduli space - Michele Cicoli, Francesc Cunillera, Antonio Padilla, Francisco G. Pedro
[2112.10796] - IR/UV Mixing, Towers of Species and Swampland Conjectures - Alberto Castellano, Alvaro Herráez, Luis E. Ibáñez
[2112.10984] - Analytic Bootstrap in 2D Boundary Conformal Field Theory: Towards Braneworld Holography - Yuya Kusuki
[2112.11398] - Global Symmetries and Partial Confinement - Masanori Hanada, Jack Holden, Matthew Knaggs, Andy O’Bannon
[2112.11401] - Double Quantization - Giulia Gubitosi, Fedele Lizzi, José Javier Relancio, Patrizia Vitale

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[2112.10398] - Dynamic Property of Phase Transition for Non-Linear Charged Anti-de Sitter black holes - Yun-Zhi Du, Huai-Fan Li Fang Liu, Li-Chun Zhang
[2112.10403] - Phase transition of non-linear charged Anti-de Sitter black holes - Yun-Zhi Du, Huai-Fan Li, Fang Liu, Ren Zhao, Li-Chun Zhang
[2112.10725] - Complexity growth in Gubser-Rocha models with momentum relaxation - H. Babaei-Aghbolagh, Davood Mahdavian Yekta, Komeil Babaei Velni, H. Mohammadzadeh

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[2112.09523] - The problem of cosmological constant in the effective approach towards quantum gravity - Petar Pavlović, Marko Sossich
[2112.09136] - Membrane Limits in Quantum Gravity - Rafael Álvarez-García, Daniel Kläwer, Timo Weigand
[2112.09284] - Vacuum decay in the Lorentzian path integral - Takumi Hayashi, Kohei Kamada, Naritaka Oshita, Jun’ichi Yokoyama