Fri - 06/17/22

There is no new related paper today

There is no new related paper today

  1. [2206.07827] - Spinor-Vector Duality and the Swampland - Alon E. Faraggi

Thu - 06/16/22

Understanding quantum black holes from quantum reduced loop gravity

  • Authors: Wen-Cong Gan, Geeth Ongole, Emanuele Alesci, Yang An, Fu-Wen Shu, Anzhong Wang
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); Astrophysics of Galaxies (astro-ph.GA); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
  • Arxiv link: https://arxiv.org/abs/2206.07127
  • Abstract We systematically study the top-down model of loop quantum black holes (LQBHs), recently derived by Alesci, Bahrami and Pranzetti (ABP). To understand the structure of the model, we first derive several well-known LQBH solutions by taking proper limits. These include the B"ohmer-Vandersloot and Ashtekar-Olmedo-Singh models, which were all obtained by the so-called bottom-up polymerizations within the framework of the minisuperspace quantizations. Then, we study the ABP model, and find that the inverse volume corrections become important only when the radius of the two-sphere is of the Planck size. For macroscopic black holes, the minimal radius obtained at the transition surface is always much larger than the Planck scale, and hence these corrections are always sub-leading. The transition surface divides the whole spacetime into two regions, and in one of them the spacetime is asymptotically Schwarzschild-like, while in the other region, the asymptotical behavior sensitively depends on the ratio of two spin numbers involved in the model, and can be divided into three different classes. In one class, the spacetime in the 2-planes orthogonal to the two spheres is asymptotically flat, and in the second one it is not even conformally flat, while in the third one it can be asymptotically conformally flat by properly choosing the free parameters of the model. In the latter, it is asymptotically de Sitter. However, in any of these three classes, sharply in contrast to the models obtained by the bottom-up approach, the spacetime is already geodesically complete, and no additional extensions are needed in both sides of the transition surface. In particular, identical multiple black hole and white hole structures do not exist.

There is no new related paper today

  1. [2206.07064] - Constraints on singularity resolution by nonlinear electrodynamics - Ana Bokulić, Tajron Jurić, Ivica Smolić

  2. [2206.07066] - Testing quantum gravity with primordial gravitational waves - Gianluca Calcagni, Leonardo Modesto

  3. [2206.07455] - Symplectic Geometry of character varieties and $SU(2)$ Lattice Gauge Theory I - T.R. Ramadas

Wed - 06/15/22

There is no new related paper today

There is no new related paper today

  1. [2206.06384] - Early universe in quantum gravity - Leonardo Modesto, Gianluca Calcagni

  2. [2206.06425] - Transient horizons: the life of a quantum black hole - Samantha Hergott, Viqar Husain, Saeed Rastgoo

  3. [2206.06899] - Signatures of regular black holes from the quasar continuum spectrum - Indrani Banerjee

  4. [2206.06762] - Quantum Gravity in 30 Questions - R. Loll, G. Fabiano, D. Frattulillo, F. Wagner

  5. [2206.06917] - Structural aspects of FRG in quantum tunnelling computations - Alfio Bonanno, Alessandro Codello, Dario Zappala’

Tue - 06/14/22

Knotted 4-regular graphs: polynomial invariants and the Pachner moves

  • Authors: Daniel Cartin
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph)
  • Arxiv link: https://arxiv.org/abs/2206.05816
  • Abstract In loop quantum gravity, states of quantum geometry are represented by classes of knotted graphs, equivalent under diffeomorphisms. Thus, it is worthwhile to enumerate and distinguish these classes. This paper looks at the case of 4-regular graphs, which have an interpretation as objects dual to triangulations of three-dimensional manifolds. Two different polynomial invariants are developed to characterize these graphs – one inspired by the Kauffman bracket relations, and the other based on quandles. How the latter invariant changes under the Pachner moves acting on the graphs is then studied.

There is no new related paper today

  1. [2206.06284] - DHOST gravity in Ultra-diffuse galaxies – Part I: the case of NGC1052-DF2 - Enrico Laudato, Vincenzo Salzano

  2. [2206.05546] - 2D quantum gravity partition function on the fluctuating sphere - Gaston Giribet, Matias Leoni

  3. [2206.06352] - Null states from large superpositions of two-sided black holes - John G. Gardiner

Mon - 06/13/22

There is no new related paper today

There is no new related paper today

  1. [2206.05064] - The minimal length is physical - Pasquale Bosso, Luciano Petruzziello, Fabian Wagner

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