Fri - 10/27/23

Scalar Cosmological Perturbations from Quantum Gravitational Entanglement

  • Authors: Alexander F. Jercher, Luca Marchetti, Andreas G. A. Pithis
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2310.17549
  • Abstract A major challenge at the interface of quantum gravity and cosmology is to explain how the large-scale structure of the Universe emerges from physics at the Planck scale. In this letter, we take an important step in this direction by extracting the dynamics of scalar isotropic cosmological perturbations from full quantum gravity, as described by the causally complete Barrett-Crane group field theory model. From the perspective of the underlying quantum gravity theory, cosmological perturbations are represented as nearest-neighbor two-body entanglement of group field theory quanta. Their effective dynamics is obtained via mean-field methods and described relationally with respect to a physical Lorentz frame causally coupled to the quantum geometry. We quantitatively study these effective dynamical equations and show that at low energies they are perfectly consistent with those of General Relativity, while for trans-Planckian scales quantum effects become important. These results therefore not only provide crucial insights into the potentially purely quantum gravitational nature of cosmological perturbations, but also offer rich phenomenological implications for the physics of the early Universe.

There is no new related paper today

  1. [2310.17311] - Gravity-induced entanglement as a probe of spacetime curvature - Suddhasattwa Brahma, Abhinove Nagarajan Seenivasan

  2. [2310.17000] - Confinement from Distance in Metric Space and its Relation to Cosmological Constant - Amineh Mohseni, Mahdi Torabian

  3. [2310.17358] - Correlators on the Wilson Line Defect CFT - Giulia Peveri

Thu - 10/26/23

There is no new related paper today

There is no new related paper today

  1. [2310.16744] - Simulating CDT quantum gravity - Joren Brunekreef, Andrzej Görlich, Renate Loll

Wed - 10/25/23

Spacetime surgery for black hole fireworks

  • Authors: Wei-Chen Lin, Dong-han Yeom, Dejan Stojkovic
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
  • Arxiv link: https://arxiv.org/abs/2310.15508
  • Abstract We construct an explicit model for the black hole to white hole transition (known as the black hole fireworks scenario) using the cut-and-paste technique. We model a black hole collapse using the evolution of a time-like shell in the background of the loop quantum gravity inspired metric. We then use the space-like shell analysis to construct the firework geometry. Our simple and well defined analysis removes some subtle issues that were present in the previous literature. In particular, we demonstrate that the null energy condition must be violated for the bounce. We also calculate the proper time scales required for the black to white hole transition, which in any valid scenario must be shorter than the evaporation time scale. In contrast, we show that the bouncing time for the distant observer can be chosen arbitrarily, since it is determined by how one cuts and pastes the spacetimes outside the event horizon, and thus does not have any obvious connection to quantum gravity effects.

There is no new related paper today

  1. [2310.15180] - Lorentzian path integral in Kantowski-Sachs anisotropic cosmology - Saumya Ghosh, Arnab Acharya, Sunandan Gangopadhyay, Prasanta K. Panigrahi

  2. [2310.15792] - Three dimensional quotient singularity and 4d $\mathcal{N}=1$ AdS/CFT correspondence - Yuanyuan Fang, Jing Feng, Dan Xie

Tue - 10/24/23

There is no new related paper today

There is no new related paper today

  1. [2310.13047] - The Influence Functional in open holography: entanglement and Rényi entropies - Pietro Pelliconi, Julian Sonner

  2. [2310.13299] - Holographic Teleportation in Quantum Critical Spin Systems - Motoaki Bamba, Koji Hashimoto, Keiju Murata, Daichi Takeda, Daisuke Yamamoto

  3. [2310.13660] - On Q-balls in Anti de Sitter Space - Arvind Rajaraman, Alexander Stewart, Christopher B. Verhaaren

  4. [2310.13663] - Hyperbolic Vacua in Minkowski Space - Walker Melton, Filip Niewinski, Andrew Strominger, Tianli Wang

  5. [2310.13503] - Dually weighted multi-matrix models as a path to causal gravity-matter systems - Juan L. A. Abranches, Antonio D. Pereira, Reiko Toriumi

Fri - 10/20/23

There is no new related paper today

There is no new related paper today

  1. [2310.12221] - Is it time to rethink quantum gravity? - Jonathan Oppenheim

  2. [2310.12922] - Celestial holography: An asymptotic symmetry perspective - Laura Donnay

Thu - 10/19/23

There is no new related paper today

There is no new related paper today

  1. [2310.11919] - Black holes with primary scalar hair - Athanasios Bakopoulos, Christos Charmousis, Panagiota Kanti, Nicolas Lecoeur, Theodoros Nakas

  2. [2310.11990] - From regular black holes to horizonless objects: quasi-normal modes, instabilities and spectroscopy - Edgardo Franzin, Stefano Liberati, Vania Vellucci

  3. [2310.11617] - Comments on the double cone wormhole - Yiming Chen, Victor Ivo, Juan Maldacena

Wed - 10/18/23

There is no new related paper today

There is no new related paper today

  1. [2310.10864] - Signatures of Rotating Black Holes in Quantum Superposition - Cendikiawan Suryaatmadja, Cemile Senem Arabaci, Matthew P. G. Robbins, Joshua Foo, Magdalena Zych, Robert B. Mann

  2. [2310.11039] - The optical appearance of a nonsingular de Sitter core black hole geometry under several thin disk emissions - I. De Martino, R. Della Monica, D. Rubiera-Garcia

  3. [2310.11041] - Weak-field regime of scalar-tensor theories with an instantaneous mode - Tsutomu Kobayashi, Takashi Hiramatsu

  4. [2310.11242] - Odd entanglement entropy in boundary conformal field theories and holographic moving mirrors - Anjali Kumari, Vinayak Raj, Gautam Sengupta

Tue - 10/17/23

There is no new related paper today

There is no new related paper today

  1. [2310.10122] - Klein-Gordon particles in a quasi-pointlike global monopole spacetime and a Wu-Yang magnetic monopole: invariance and isospectrality - Omar Mustafa

Mon - 10/16/23

Generalised Gaussian states in group field theory

  • Authors: Andrea Calcinari, Steffen Gielen
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
  • Arxiv link: https://arxiv.org/abs/2310.08667
  • Abstract We define generalised Gaussian states in group field theory built on a single field mode, and study their semiclassical properties relevant for the application to cosmology. These states are generalisations of coherent, squeezed and thermal states considered previously. As two possible characterisations of semiclassicality, we contrast the requirement of small relative fluctuations in volume and energy with the saturation of the Robertson-Schr"odinger uncertainty principle. We find that for the most general class of states the appearance of small relative fluctuations, which we take as the main criterion relevant for the emergence of cosmology, is mostly determined by the amount of displacement used to define the state. We also observe that defining such generalised Gaussian states is less straightforward in the algebraic approach to canonical quantisation of GFT, and discuss special cases.

There is no new related paper today

  1. [2310.09224] - Testing Lorentz symmetry with space-based gravitational-wave detectors - Cheng-Gang Qin, Jun Ke, Qin Li, Ya-Fen Chen, Jie Luo, Yu-Jie Tan, Cheng-Gang Shao

  2. [2310.08632] - One- and two-dimensional higher-point conformal blocks as free-particle wavefunctions in AdS$_3^{\otimes m}$ - Jean-François Fortin, Wen-Jie Ma, Sarthak Parikh, Lorenzo Quintavalle, Witold Skiba

New papers last week