Fri - 06/10/22

There is no new related paper today

Towards “matter matters” in spin foam quantum gravity

  • Authors: Masooma Ali, Sebastian Steinhaus
  • Subjects: General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2206.04076
  • Abstract Any approach to pure quantum gravity must eventually face the question of coupling quantum matter to the theory. In the past, several ways of coupling matter to spin foam quantum gravity have been proposed, but the dynamics of the coupled matter-gravity system is challenging to explore. To take first steps towards uncovering the influence quantum matter has on spin foam models, we couple free, massive scalar lattice field theory to a restricted, semi-classical 4d spin foam model, called quantum cuboids. This model can be understood as a superposition of hypercuboidal (and thus irregular) lattices. Both theories are coupled by defining scalar lattice field theory on irregular lattices via discrete exterior calculus and then superimposing these theories by summing over spin foam configurations. We compute expectation values of geometric and matter observables using Markov Chain Monte Carlo techniques. From the observables, we identify a regime in parameter space, in which the spin foam possesses a finite total volume and looks on average like a regular lattice with an emergent lattice spacing dependent on the mass of the scalar field. We also measure the 2-point correlation function and correlation length of the scalar field in relation to the geodesic distance encoded in the spin foam. Our results are consistent with the correlation function of ordinary scalar lattice field theory defined on a fixed regular lattice with the emergent lattice spacing and the same mass. We conclude that in this regime of the model, the scalar field is not sensitive to the fluctuations of the spin foam and effectively behaves as if it is defined on a fixed regular lattice.

  1. [2206.04464] - Early evolution of fully convective stars in scalar-tensor gravity - Débora Aguiar Gomes, Aneta Wojnar

  2. [2206.04505] - Generalised Hayward spacetimes: geometry, matter and scalar quasinormal modes - Poulami Dutta Roy, Sayan Kar (IIT Kharagpur)

  3. [2206.04063] - Sharpening the Distance Conjecture in Diverse Dimensions - Muldrow Etheredge, Ben Heidenreich, Sami Kaya, Yue Qiu, Tom Rudelius

  4. [2206.04072] - Causality, unitarity and stability in quantum gravity: a non-perturbative perspective - Alessia Platania

  5. [2206.04407] - Effect of Minimal Length on Landau Diamagnetism and de Haas-van Alphen Effect - Md. Abhishek, Bhabani Prasad Mandal

Thu - 06/09/22

There is no new related paper today

There is no new related paper today

  1. [2206.03729] - Testing regular black holes with X-ray and GW data - Shafqat Riaz, Swarnim Shashank, Rittick Roy, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi, Zuobin Zhang, Menglei Zhou

  2. [2206.03814] - Some remarks on non-singular spherically symmetric space-times - Lorenzo Sebastiani, Sergio Zerbini

  3. [2206.03509] - Wigner meets ‘t Hooft near the black hole horizon - Clifford V. Johnson

  4. [2206.03763] - Topological T-duality for bundles of strongly self-absorbing C-algebras and some physical applications* - Ashwin S. Pande

Wed - 06/08/22

Matter Bounce Scenario in Extended Symmetric Teleparallel Gravity

  • Authors: A.S. Agrawal, B. Mishra, P.K. Agrawal
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th)
  • Arxiv link: https://arxiv.org/abs/2206.02783
  • Abstract In this paper, we have shown the matter bounce scenario of the Universe in an extended symmetric teleparallel gravity, the $f(Q)$ gravity. Motivated from the bouncing scenario and loop quantum cosmology (LQC), the form of the function $f(Q)$ has been obtained at the backdrop of Friedmann-Lema$\hat{i}$tre-Robertson Walker (FLRW) space time. Considering the background cosmology dominated by dust fluid, the e-folding parameter has been expressed, which contains the nonmetricity term. The dynamics of the model has been studied through the phase space analysis, where both the stable and unstable nodes are obtained. Also, the stability analysis has been performed with the first order scalar perturbation of the Hubble parameter and matter energy density to verify the stability of the model.

There is no new related paper today

  1. [2206.03006] - Deep Learning Metric Detectors in General Relativity - Ryota Katsube, Wai-Hong Tam, Masahiro Hotta, Yasusada Nambu

  2. [2206.03161] - Black hole entropy and long strings - Erik P. Verlinde, Manus R. Visser

  3. [2206.03414] - Coarse graining pure states in AdS/CFT - Jeevan Chandra, Thomas Hartman

Tue - 06/07/22

There is no new related paper today

There is no new related paper today

  1. [2206.02259] - Quantum gravity on finite spacetimes and dynamical mass - J.N. Argota-Quiroz, S. Majid

Mon - 06/06/22

There is no new related paper today

There is no new related paper today

  1. [2206.01546] - Tunneling Analysis of Kerr-Newman Black Hole-Like Solution in Rastall Theory - Riasat Ali, Kazuharu Bamba, Syed Asif Ali Shah, Muhammad Junaid Saleem

  2. [2206.01603] - Obstacles for dS in Supersymmetric Theories - Maxim Emelin

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