Fri - 04/14/23

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Gravitational Edge Mode in Asymptotically AdS$_2$: JT Gravity Revisited

  • Authors: Euihun Joung, Prithvi Narayan, Junggi Yoon
  • Subjects: High Energy Physics - Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); General Relativity and Quantum Cosmology (gr-qc)
  • Arxiv link: https://arxiv.org/abs/2304.06088
  • Abstract We study the gravitational edge mode of the Jackiw-Teitelboim (JT) gravity and the constrained $sl(2,\mathbb{R})$ BF theory for the asymptotically AdS$_2$. We revisit the derivation of the Schwarzian theory from the wiggling boundary as an action for the gravitational edge mode. We present an alternative description for the gravitational edge mode from the metric fluctuation with the fixed boundary, which is also known as the would-be gauge mode in the gravity. We clarify the relation between the wiggling boundary and the would-be gauge mode. We demonstrate a natural top-down derivation of $PSL(2,\mathbb{R})$ gauging and the path integral measure of the Schwarzian theory. In the constrained $sl(2,\mathbb{R})$ BF theory, we develop a method for incorporating the gravitational edge mode in the BF theory. In this BF theory coupled to the edge mode, we derive the Schwarzian theory with $PSL(2,\mathbb{R})$ gauging. We show that the Haar measure for the Iwasawa decomposition of $PSL(2,\mathbb{R})$ leads to the path integral measure.

  1. [2304.06494] - On the thermodynamics of reconciling quantum and gravity - H. Moradpour, S. Jalalzadeh, Umesh Kumar Sharma

  2. [2304.06593] - Entanglement entropy for spherically symmetric regular black holes - Orlando Luongo, Stefano Mancini, Paolo Pierosara

Thu - 04/13/23

Loop Quantum Cosmology: Physics of Singularity Resolution and its Implications

  • Authors: Bao-Fei Li, Parampreet Singh
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Nongalactic Astrophysics (astro-ph.CO)
  • Arxiv link: https://arxiv.org/abs/2304.05426
  • Abstract The occurrence of singularities where spacetime curvature becomes infinite and geodesic evolution breaks down are inevitable events in classical general relativity (GR) unless one chooses an exotic matter violating weak energy condition. These singularities show up in various physical processes, such as the gravitational collapse, the birth of the universe in the standard cosmology as well as the classical solutions of the black hole spacetimes. In the last two decades, a rigorous understanding of the dynamics of quantum spacetime and the way it resolves singularities has been achieved in loop quantum cosmology (LQC) which applies the concepts and techniques of loop quantum gravity to the symmetry reduced cosmological spacetimes. Due to the fundamental discreteness of quantum geometry derived from the quantum theory, the big bang singularity has been robustly shown to be replaced by a big bounce. Strong curvature singularities intrinsic in the classical cosmology are generically resolved for a variety of cosmological spacetimes including anisotropic models and polarized Gowdy models. Using effective spacetime description the LQC universe also provides an ultra-violet complete description of the classical inflationary scenario as well as its alternatives such as the ekpyrotic and matter bounce scenarios. In this chapter we provide a summary of singularity resolution and its physical implications for various isotropic and anisotropic cosmological spacetimes in LQC and analyze robustness of results through variant models originating from different quantization prescriptions.

There is no new related paper today

  1. [2304.05408] - Einstein-Rosen bridge from the minimal length - Kimet Jusufi, Emmanuel Moulay, Jonas Mureika, Ahmed Farag Ali

  2. [2304.05421] - Regular black holes and the first law of black hole mechanics - Sebastian Murk, Ioannis Soranidis

  3. [2304.05751] - Generalized Volume-Complexity for RN-AdS Black Hole - Meng-Ting Wang, Hong-Yue Jiang, Yu-Xiao Liu

Wed - 04/12/23

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There is no new related paper today

Tue - 04/11/23

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There is no new related paper today

  1. [2304.03819] - Aspects of Everpresent $Λ$ (I): A Fluctuating Cosmological Constant from Spacetime Discreteness - Santanu Das, Arad Nasiri, Yasaman K. Yazdi

  2. [2304.04684] - Correlation Functions in the TsT/$T{\bar T}$ Correspondence - Wei Cui, Hongfei Shu, Wei Song, Juntao Wang

Mon - 04/10/23

Quantum circuits for the Ising spin networks

  • Authors: Grzegorz Czelusta, Jakub Mielczarek
  • Subjects: General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th); Quantum Physics (quant-ph)
  • Arxiv link: https://arxiv.org/abs/2304.03559
  • Abstract Spin network states are a powerful tool for constructing the $SU(2)$ gauge theories on a graph. In loop quantum gravity (LQG), they have yielded many promising predictions, although progress has been limited by the computational challenge of dealing with high-dimensional Hilbert spaces. To explore more general configurations, quantum computing methods can be applied by representing spin network states as quantum circuits. In this article, we introduce an improved method for constructing quantum circuits for 4-valent Ising spin networks, which utilizes a smaller number of qubits than previous approaches. This has practical implications for the implementation of quantum circuits. We also demonstrate the procedure with various examples, including the construction of a 10-node Ising spin network state. The key ingredient of the method is the variational transfer of partial states, which we illustrate through numerous examples. Our improved construction provides a promising avenue for further exploring the potential of quantum computing methods in quantum gravity research.

There is no new related paper today

  1. [2304.03402] - On-shell equation of the Lorentzian classicalized holographic tensor network - Eiji Konishi

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