Fri - 07/09/21

There is no new related paper today

There is no new related paper today

  1. [2107.03406] - A nested sequence of comoving Rindler frames, the corresponding vacuum states, and the local nature of acceleration temperature - Kinjalk Lochan, T. Padmanabhan

  2. [2107.03456] - Disformal mappings of spherical DHOST geometries - Valerio Faraoni, Alexandre Leblanc

Thu - 07/08/21

Hawking radiation by spherically-symmetric static black holes for all spins: II – Numerical emission rates, analytical limits and new constraints

  • Authors: Alexandre Arbey, Jérémy Auffinger, Marc Geiller, Etera R. Livine, Francesco Sartini
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2107.03293
  • Abstract In the companion paper [Phys. Rev. D 103 (2021) 10, [2101.02951]] we have derived the short-ranged potentials for the Teukolsky equations for massless spins $(0,1/2,1,2)$ in general spherically-symmetric and static metrics. Here we apply these results to numerically compute the Hawking radiation spectra of such particles emitted by black holes (BHs) in three different ansatz: charged BHs, higher-dimensional BHs, and polymerized BHs arising from models of quantum gravity. In order to ensure the robustness of our numerical procedure, we show that it agrees with newly derived analytic formulas for the cross-sections in the high and low energy limits. We show how the short-ranged potentials and precise Hawking radiation rates can be used inside the code $\texttt{BlackHawk}$ to predict future primordial BH evaporation signals for a very wide class of BH solutions, including the promising regular BH solutions derived from loop quantum gravity. In particular, we derive the first Hawking radiation constraints on polymerized BHs from AMEGO. We prove that the mass window $10^{16}-10^{18}\,$g for all dark matter into primordial BHs can be reopened with high values of the polymerization parameter, which encodes the typical scale and strength of quantum gravity corrections.

The Ponzano-Regge cylinder and Propagator for 3d quantum gravity

  • Authors: Etera R. Livine
  • Subjects: High Energy Physics - Theory (hep-th); Mathematical Physics (math-ph)
  • Arxiv link: https://arxiv.org/abs/2107.03264
  • Abstract We investigate the propagator of 3d quantum gravity, formulated as a discrete topological path integral. We define it as the Ponzano-Regge amplitude of the solid cylinder swept by a 2d disk evolving in time. Quantum states for a 2d disk live in the tensor products of N spins, where N is the number of holonomy insertions connecting to the disk boundary. We formulate the cylindric amplitude in terms of a transfer matrix and identify its eigen-modes in terms of spin recoupling. We show that the propagator distinguishes the subspaces with different total spin and may select the vanishing total spin sector at late time depending on the chosen cylinder boundary data. We discuss applications to quantum circuits and the possibility of experimental simulations of this 3d quantum gravity propagator.

Wed - 07/07/21

There is no new related paper today

There is no new related paper today

Tue - 07/06/21

There is no new related paper today

There is no new related paper today

  1. [2107.01866] - Thermodynamic Geometry of Bardeen Black Holes - Yang Guo, Yan-Gang Miao

  2. [2107.02077] - Baryon Asymmetry from the Generalized Uncertainty Principle - Saurya Das, Mitja Fridman, Gaetano Lambiase, Elias C. Vagenas

  3. [2107.01371] - On Unimodular Gauge of Quantum Gravity - Ryuichi Nakayama

  4. [2107.01423] - Vainshtein Mechanism in Generalised Massive Gravity - A. Emir Gumrukcuoglu, Rampei Kimura, Michael Kenna-Allison, Kazuya Koyama

  5. [2107.01732] - Gauge Theory and the Analytic Form of the Geometric Langlands Program - Davide Gaiotto, Edward Witten

  6. [2107.01788] - Integrability of the conformal loop ensemble - Morris Ang, Xin Sun

Mon - 07/05/21

Black Hole Shadows: How to Fixthe Extended Gravity Theory

  • Authors: V.Prokopova, S.Alexeyeva, O.Zenin
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2107.01115
  • Abstract The first images of black hole shadows open new possibilities to develop modern extended gravity theories. We discuss the shadow calculations in non-rotating case both when $g_{11} = - g_{00}^{-1}$ and $g_{11} \neq - g_{00}^{-1}$. We demonstrate the application to few different models: Horndesky theory with Gauss-Bonnet invariant, loop quantum gravity and conformal gravity. The difference of these theories from shadow models with the theory of general relativity is shown. In addition we show that when the rotation is taken into account the requirements to the observational accuracy decrease.

There is no new related paper today

  1. [2107.00671] - Essential Quantum Einstein Gravity - Alessio Baldazzi, Kevin Falls

  2. [2107.01071] - Asymptotically Safe Gravity-Fermion systems on curved backgrounds - Jesse Daas, Wouter Oosters, Frank Saueressig, Jian Wang

  3. [2107.01172] - Sphere and disk partition functions in Liouville and in matrix integrals - Raghu Mahajan, Douglas Stanford, Cynthia Yan

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