Fri - 04/12/24

There is no new related paper today

There is no new related paper today

  1. [2404.07524] - Photon Counting Interferometry to Detect Geontropic Space-Time Fluctuations with GQuEST - Sander M. Vermeulen, Torrey Cullen, Daniel Grass, Ian A. O. MacMillan, Alexander J. Ramirez, Jeffrey Wack, Boris Korzh, Vincent S. H. Lee, Kathryn M. Zurek, Chris Stoughton, Lee McCuller

  2. [2404.07589] - See the lightning, hear the thunder: quasinormal modes-shadow correspondence for rotating regular black holes - Davide Pedrotti, Sunny Vagnozzi

  3. [2404.07723] - The classical-quantum hybrid canonical dynamics and its difficulties with special and general relativity - Lajos Diósi

  4. [2404.07925] - Non-perturbative quantum gravity denounces singular Black Holes - Alexey Koshelev, Anna Tokareva

  5. [2404.07834] - Tensor models and group field theories: combinatorics, large $N$ and renormalization - Sylvain Carrozza

Thu - 04/11/24

There is no new related paper today

There is no new related paper today

  1. [2404.07058] - Inner-extremal regular black holes from pure gravity - Francesco Di Filippo, Ivan Kolář, David Kubiznak

  2. [2404.07173] - Microstates of accelerating and supersymmetric AdS$_4$ black holes from the spindle index - Edoardo Colombo, Seyed Morteza Hosseini, Dario Martelli, Antonio Pittelli, Alberto Zaffaroni

Wed - 04/10/24

Emergent Modified Gravity

  • Authors: Martin Bojowald, Erick I. Duque
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Theory (hep-th)
  • Arxiv link: https://arxiv.org/abs/2404.06375
  • Abstract A complete canonical formulation of general covariance makes it possible to construct new modified theories of gravity that are not of higher-curvature form, as shown here in a spherically symmetric setting. The usual uniqueness theorems are evaded by using a crucial and novel ingredient, allowing for fundamental fields of gravity distinct from an emergent space-time metric that provides a geometrical structure to all solutions. As specific examples, there are new expansion-shear couplings in cosmological models, a form of modified Newtonian dynamics (MOND) can appear in a space-time covariant theory without introducing extra fields, and related effects help to make effective models of canonical quantum gravity fully consistent with general covariance.

There is no new related paper today

  1. [2404.05957] - Constraining a disformal Schwarzschild black hole in DHOST theories with the orbit of the S2 star - Zelin Zhang, Songbai Chen, Jiliang Jing

  2. [2404.05851] - Entanglement entropy in lattices with non-abelian gauge groups - Mihael Hategan-Marandiuc

  3. [2404.06060] - Bose-Einstein condensate as a quantum gravity probe; “Erste Abhandlung” - Soham Sen, Sunandan Gangopadhyay

Tue - 04/09/24

Gravitational collapse in effective loop quantum gravity: beyond marginally bound configurations

  • Authors: Lorenzo Cipriani, Francesco Fazzini, Edward Wilson-Ewing
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2404.04192
  • Abstract We study gravitational collapse in effective loop quantum gravity, focusing on non-marginally bound configurations in Lema\^itre-Tolman-Bondi spacetimes. In the homogeneous limit we recover the effective dynamics of loop quantum cosmology for Friedman cosmologies with spatial curvature. We study a particular family of configurations with a homogeneous interior and a sharp boundary where the dust energy density rapidly and continuously decreases to zero. For these configurations, the gravitational collapse continues to the Planck regime when a bounce occurs, at which point the dust ball starts to expand, and a shock wave forms in the gravitational field within the order of a Planck time after the bounce. The shock slowly moves outwards, eventually reaching the horizon which then disappears, at which time there is no longer a black hole. If the initial configuration is bound, the shock asymptotes to a maximal radius, whereas for unbound initial configurations the shock escapes to infinity. In all cases, the black hole lifetime is proportional to the square of the black hole mass, and additionally depends on how strongly bound the dust profile is; this last quantity also affects the vacuum region outside the dust profile which is not solely determined by the black hole mass and charge as in spherically symmetric general relativity. We also use numerics to study a wide range of other types of initial configurations, both bound and unbound, with qualitatively similar results.

There is no new related paper today

  1. [2404.03779] - Primordial black holes and induced gravitational waves in non-singular matter bouncing cosmology - Theodoros Papanikolaou, Shreya Banerjee, Yi-Fu Cai, Salvatore Capozziello, Emmanuel N. Saridakis

  2. [2404.04076] - Neutrinos as possible probes for quantum gravity - Marco Danilo Claudio Torri, Lino Miramonti

  3. [2404.03748] - Finite cut-off JT and Liouville quantum gravities on the disk at one loop - Soumyadeep Chaudhuri, Frank Ferrari

  4. [2404.04134] - Explorations in Precision Holography and Higher-derivative Supergravity - Robert J. Saskowski

Mon - 04/08/24

Gravitational collapse in effective loop quantum gravity: beyond marginally bound configurations

  • Authors: Lorenzo Cipriani, Francesco Fazzini, Edward Wilson-Ewing
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2404.04192
  • Abstract We study gravitational collapse in effective loop quantum gravity, focusing on non-marginally bound configurations in Lema\^itre-Tolman-Bondi spacetimes. In the homogeneous limit we recover the effective dynamics of loop quantum cosmology for Friedman cosmologies with spatial curvature. We study a particular family of configurations with a homogeneous interior and a sharp boundary where the dust energy density rapidly and continuously decreases to zero. For these configurations, the gravitational collapse continues to the Planck regime when a bounce occurs, at which point the dust ball starts to expand, and a shock wave forms in the gravitational field within the order of a Planck time after the bounce. The shock slowly moves outwards, eventually reaching the horizon which then disappears, at which time there is no longer a black hole. If the initial configuration is bound, the shock asymptotes to a maximal radius, whereas for unbound initial configurations the shock escapes to infinity. In all cases, the black hole lifetime is proportional to the square of the black hole mass, and additionally depends on how strongly bound the dust profile is; this last quantity also affects the vacuum region outside the dust profile which is not solely determined by the black hole mass and charge as in spherically symmetric general relativity. We also use numerics to study a wide range of other types of initial configurations, both bound and unbound, with qualitatively similar results.

There is no new related paper today

  1. [2404.03779] - Primordial black holes and induced gravitational waves in non-singular matter bouncing cosmology - Theodoros Papanikolaou, Shreya Banerjee, Yi-Fu Cai, Salvatore Capozziello, Emmanuel N. Saridakis

  2. [2404.04076] - Neutrinos as possible probes for quantum gravity - Marco Danilo Claudio Torri, Lino Miramonti

  3. [2404.03748] - Finite cut-off JT and Liouville quantum gravities on the disk at one loop - Soumyadeep Chaudhuri, Frank Ferrari

  4. [2404.04134] - Explorations in Precision Holography and Higher-derivative Supergravity - Robert J. Saskowski

New papers last week