Fri - 07/28/23

There is no new related paper today

There is no new related paper today

  1. [2307.15003] - Luminosity of accretion disks around rotating regular black holes - Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Aliya Taukenova, Ainur Urazalina

  2. [2307.14416] - Cosmology from random entanglement - Stefano Antonini, Martin Sasieta, Brian Swingle

  3. [2307.14458] - Vulnerability of Horizon Regularity: Horizon as a Natural Boundary - Qi-Yuan Mao, Liang Ma, H. Lu

  4. [2307.14977] - Accelerated Particle Detectors with Modified Dispersion Relations - Paul C.W. Davies, Philip Tee

Thu - 07/27/23

Generalised Amit-Roginsky model from perturbations of 3d quantum gravity

  • Authors: Victor Nador, Daniele Oriti, Xiankai Pang, Adrian Tanasa, Yi-Li Wang
  • Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph)
  • Arxiv link: https://arxiv.org/abs/2307.14211
  • Abstract A generalised Amit-Roginsky vector model in flat space is obtained as the effective dynamics of pertubations around a classical solution of the Boulatov group field theory for 3d euclidean quantum gravity, extended to include additional matter degrees of freedom. By further restricting the type of perturbations, the original Amit-Roginsky model can be obtained. This result suggests a general link (and possibly a unified framework) between two types of tensorial quantum field theories: quantum geometric group field theories and tensorial models for random geometry, on one hand, and melonic-dominated vector and tensorial models in flat space, such as the Amit-Roginsky model (and the SYK model), on the other hand.

There is no new related paper today

Wed - 07/26/23

There is no new related paper today

There is no new related paper today

  1. [2307.13249] - Regular Black Holes: Towards a New Paradigm of Gravitational Collapse - Cosimo Bambi

  2. [2307.13489] - Living on the Edge: Quantum Black Hole Physics from the Event Horizon - Manuel Del Piano, Stefan Hohenegger, Francesco Sannino

  3. [2307.13027] - Generalized Symmetries, Gravity, and the Swampland - Mirjam Cvetič, Jonathan J. Heckman, Max Hübner, Ethan Torres

  4. [2307.13051] - Constructing all BPS black hole microstates from the gravitational path integral - Jan Boruch, Luca V. Iliesiu, Cynthia Yan

  5. [2307.13357] - Correlation function of fundamental fermion in holographic QCD - Si-wen Li, Yi-peng Zhang, Hao-qian Li

Tue - 07/25/23

Effects of the inflaton potential on the primordial power spectrum in Loop Quantum Cosmology scenarios

  • Authors: Beatriz Elizaga Navascués, Guillermo A. Mena Marugán, Jesús Yébana Carrilero
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2307.12026
  • Abstract In scenarios of physical interest in Loop Quantum Cosmology, with a preinflationary epoch where the kinetic energy of the inflaton dominates, the analytic study of the dynamics of the primordial fluctuations has been carried out by neglecting the inflaton potential in those stages of the evolution. In this work we develop approximations to investigate the influence of the potential as the period of kinetic dominance gives way to the inflationary regime, treating the potential as a perturbation. Specifically, we study how the potential modifies the effective mass that dictates the dynamics of the scalar perturbations in the preinflationary epochs, within the framework of the so-called hybrid prescription for Loop Quantum Cosmology. Moreover, we motivate and model a transition period that connects the kinetically dominated regime with inflation, allowing us to study the interval of times where the contribution of the potential is no longer negligible but an inflationary description is not yet valid. Finally, we include the main modifications coming from a slow-roll approximation to the evolution of the perturbations during inflation. We analytically solve the dynamics of the perturbations in each of these different epochs of cosmological evolution, starting from initial conditions fixed by the criterion of asymptotic Hamiltonian diagonalization. This allows us to compute the primordial power spectrum, which we evaluate and quantitatively analyze in a particular case, with a quadratic inflaton potential.

There is no new related paper today

  1. [2307.12096] - The Interiors of Singularity-Free Rotating Black Holes - Ramon Torres

  2. [2307.12102] - The semiclassical limit of quantum gravity and the problem of time - R. I. Ayala Oña, M. B. Kalmykov, D. P. Kislyakova, T. P. Shestakova

  3. [2307.12357] - Regular black holes from higher-derivative effective delta sources - Breno L. Giacchini, Tibério de Paula Netto

Mon - 07/24/23

Conformally Invariant Brans-Dicke Loop Quantum Cosmology: A Quantum Geometric Model of Linking Theory

  • Authors: Chun-Yen Lin, Xiangjing Liu, Yongge Ma, Cong Zhang
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2307.11222
  • Abstract The loop quantization of the conformal Brans-Dicke cosmology is explored in the spatially flat and Bianchi-I setting. The scalar and conformal constraints governing the canonical model are quantized using the loop techniques. The physical Hilbert space of quantum spacetimes satisfying both quantum constraints is then obtained by incorporating the quantum geometric features. The Schr"odinger cosmic evolutions are derived with the relational Heisenberg observables describing the dynamical degrees of freedom with respect to the chosen reference degrees of freedom, with the latter providing the physical coordinates for the spatial hypersurfaces and the conformal scales. We show that the emerging Schr"odinger theories contain not only the loop quantum cosmology of GR, but also that of the so-called shape dynamics. The exact dictionary between the two theories is achieved via the underlying physical Hilbert space possessing the additional (loop-corrected) conformal symmetry.

There is no new related paper today

  1. [2307.11391] - Detecting Extra Dimension By the Experiment of the Quantum Gravity Induced Entanglement of Masses - Shuai Feng, Bao-Min Gu, Fu-Wen Shu

  2. [2307.11199] - A new picture of quantum tunneling in the real-time path integral from Lefschetz thimble calculations - Jun Nishimura, Katsuta Sakai, Atis Yosprakob

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