Einstein-Rosen Bridge (ER), Einstein-Podolsky-Rosen Experiment (EPR) and Zero Measure Rindler-KAM Cantorian Spacetime Geometry (ZMG) Are Conceptually Equivalent
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Immirzi Parameter Without Immirzi Ambiguity: Conformal Loop Quantization of Scalar-Tensor Gravity
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Aberdeen University Research Archive PHYSICAL REVIEW D 96, 084011 (2017) Immirzi parameter without Immirzi ambiguity: Conformal loop quantization of scalar-tensor gravity † Olivier J. Veraguth* and Charles H.-T. Wang Department of Physics, University of Aberdeen, King’s College, Aberdeen AB24 3UE, United Kingdom (Received 25 May 2017; published 5 October 2017) Conformal loop quantum gravity provides an approach to loop quantization through an underlying conformal structure i.e. conformally equivalent class of metrics. The property that general relativity itself has no conformal invariance is reinstated with a constrained scalar field setting the physical scale. Conformally equivalent metrics have recently been shown to be amenable to loop quantization including matter coupling. It has been suggested that conformal geometry may provide an extended symmetry to allow a reformulated Immirzi parameter necessary for loop quantization to behave like an arbitrary group parameter that requires no further fixing as its present standard form does. Here, we find that this can be naturally realized via conformal frame transformations in scalar-tensor gravity. Such a theory generally incorporates a dynamical scalar gravitational field and reduces to general relativity when the scalar field becomes a pure gauge. In particular, we introduce a conformal Einstein frame in which loop quantization is implemented. We then discuss how different Immirzi parameters under this description may be related by conformal frame transformations and yet share the same quantization having, for example, the same area gaps, modulated by the scalar gravitational field. DOI: 10.1103/PhysRevD.96.084011 I. -
Arxiv:1108.1178V2 [Gr-Qc]
Quantum simplicial geometry in the group field theory formalism: reconsidering the Barrett-Crane model Aristide Baratin∗1 and Daniele Oriti†2 1Centre de Physique Th´eorique, CNRS UMR 7644, Ecole Polytechnique F-9112 Palaiseau Cedex, France 2Max-Planck-Institut f¨ur Gravitationsphysik Albert Einstein Institute Am M¨uhlenberg 2, 14476, Golm, Germany, EU A dual formulation of group field theories, obtained by a Fourier transform mapping functions on a group to functions on its Lie algebra, has been proposed recently. In the case of the Ooguri model for SO(4) BF theory, the variables of the dual field variables are thus so(4) bivectors, which have a direct interpretation as the discrete B variables. Here we study a modification of the model by means of a constraint operator implementing the simplicity of the bivectors, in such a way that projected fields describe metric tetrahedra. This involves a extension of the usual GFT framework, where boundary operators are labelled by projected spin network states. By construction, the Feynman amplitudes are simplicial path integrals for constrained BF theory. We show that the spin foam formulation of these amplitudes corresponds to a variant of the Barrett-Crane model for quantum gravity. We then re-examin the arguments against the Barrett-Crane model(s), in light of our construction. Introduction Group field theories (GFT) represent a second quantized framework for both spin networks and simplicial geometry [6, 7, 9], field theories on group manifolds (or Lie algebras) producing Feynman amplitudes which can be equivalently expressed as simplicial gravity path integrals [5] or spin foam models [10], in turn covariant formulations of spin networks dynamics [1]3. -
Tsallis, Rényi and Sharma-Mittal Holographic Dark Energy Models in Loop Quantum Cosmology
S S symmetry Article Tsallis, Rényi and Sharma-Mittal Holographic Dark Energy Models in Loop Quantum Cosmology Abdul Jawad 1 , Kazuharu Bamba 2,*, Muhammad Younas 1, Saba Qummer 1 and Shamaila Rani 1 1 Department of Mathematics, COMSATS University Islamabad, Lahore Campus, Lahore-54000, Pakistan; [email protected] or [email protected] (A.J.); [email protected] (M.Y.); [email protected] (S.Q.); [email protected] (S.R.) 2 Division of Human Support System, Faculty of Symbiotic Systems Science, Fukushima University, Fukushima 960-1296, Japan * Correspondence: [email protected] Received: 7 October 2018; Accepted: 31 October 2018; Published: 13 Novemebr 2018 Abstract: The cosmic expansion phenomenon is being studied through the interaction of newly proposed dark energy models (Tsallis, Rényi and Sharma-Mittal holographic dark energy (HDE) models) with cold dark matter in the framework of loop quantum cosmology. We investigate different cosmic implications such as equation of state parameter, squared sound speed and cosmological plane 0 0 (wd-wd, wd and wd represent the equation of state (EoS) parameter and its evolution, respectively). It is found that EoS parameter exhibits quintom like behavior of the universe for all three models of HDE. The squared speed of sound represents the stable behavior of Rényi HDE and Sharma-Mittal 0 HDE at the latter epoch while unstable behavior for Tsallis HDE. Moreover, wd-wd plane lies in the thawing region for all three HDE models. Keywords: cosmoligical parameters; dark energy models; loop quantum cosmology 1. Introduction Observational data from type Ia supernovae (SNIa) [1–4], the large scale structure (LSS) [5–8] and the cosmic microwave background (CMB), anisotropies [9–11], tell us that the universe undergoes an accelerated expansion at the present time. -
An Introduction to Loop Quantum Gravity with Application to Cosmology
DEPARTMENT OF PHYSICS IMPERIAL COLLEGE LONDON MSC DISSERTATION An Introduction to Loop Quantum Gravity with Application to Cosmology Author: Supervisor: Wan Mohamad Husni Wan Mokhtar Prof. Jo~ao Magueijo September 2014 Submitted in partial fulfilment of the requirements for the degree of Master of Science of Imperial College London Abstract The development of a quantum theory of gravity has been ongoing in the theoretical physics community for about 80 years, yet it remains unsolved. In this dissertation, we review the loop quantum gravity approach and its application to cosmology, better known as loop quantum cosmology. In particular, we present the background formalism of the full theory together with its main result, namely the discreteness of space on the Planck scale. For its application to cosmology, we focus on the homogeneous isotropic universe with free massless scalar field. We present the kinematical structure and the features it shares with the full theory. Also, we review the way in which classical Big Bang singularity is avoided in this model. Specifically, the spectrum of the operator corresponding to the classical inverse scale factor is bounded from above, the quantum evolution is governed by a difference rather than a differential equation and the Big Bang is replaced by a Big Bounce. i Acknowledgement In the name of Allah, the Most Gracious, the Most Merciful. All praise be to Allah for giving me the opportunity to pursue my study of the fundamentals of nature. In particular, I am very grateful for the opportunity to explore loop quantum gravity and its application to cosmology for my MSc dissertation. -
Observational Test of Inflation in Loop Quantum Cosmology
AEI-2011-042 Observational test of inflation in loop quantum cosmology Martin Bojowald1, Gianluca Calcagni2, and Shinji Tsujikawa3 1Institute for Gravitation and the Cosmos, The Pennsylvania State University 104 Davey Lab, University Park, PA 16802, U.S.A. 2Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Am M¨uhlenberg 1, D-14476 Golm, Germany 3Department of Physics, Faculty of Science, Tokyo University of Science 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan E-mail: [email protected], [email protected], [email protected] Abstract: We study in detail the power spectra of scalar and tensor perturbations generated during inflation in loop quantum cosmology (LQC). After clarifying in a novel quantitative way how inverse-volume corrections arise in inhomogeneous set- tings, we show that they can generate large running spectral indices, which generally lead to an enhancement of power at large scales. We provide explicit formulas for the scalar/tensor power spectra under the slow-roll approximation, by taking into ac- count corrections of order higher than the runnings. We place observational bounds on the inverse-volume quantum correction δ a−σ (σ> 0, a is the scale factor) and arXiv:1107.1540v1 [gr-qc] 8 Jul 2011 ∝ the slow-roll parameter ǫV for power-law potentials as well as exponential potentials by using the data of WMAP 7yr combined with other observations. We derive the constraints on δ for two pivot wavenumbers k0 for several values of δ. The quadratic potential can be compatible with the data even in the presence of the LQC correc- tions, but the quartic potential is in tension with observations. -
On Superstatistics and Black Hole Quasinormal Modes
On superstatistics and black hole quasinormal modes. Aldo Mart´ınez-Merinoa , M. Sabidob a Departamento de Ciencias Naturales y Exactas, CU Valles, Universidad de Guadalajara. Carretera Guadalajara - Ameca Km. 45.5, C.P. 46600, Ameca, Jalisco, M´exico. b Departamento de F´ısicade la Universidad de Guanajuato, A.P. E-143, C.P. 37150, Le´on,Guanajuato, M´exico. Abstract It is known that one can determine that lowest value of spin is jmin = 1, by using the quasinormal modes of black holes, the Bekenstein-Hawking entropy and Boltzmann-Gibbs statistics. In this paper, to determine jmin, we have used non extensive entropies that depend only on the probability (known as Obregon’s entropies and have been derived from superstatistics), as well as non extensive entropies that have free parameters . We find that jmin depends on the area and the non extensive parameter. In particular, for the non extensive entropies that only depend on the probability and find that the modification is only present for micro black holes. For classical black holes, the results are the same as for the Boltzmann-Gibbs statistics. 1. Introduction Black holes are one of the most enigmatic and enticing objects of study and just recently, a direct verification of their existence was provided by Event Horizon Telescope collaboration [1]. Despite the amount of research on the subject there are several unanswered questions. Quantization of black holes was proposed in the pioneering work of Bekenstein [2], he suggested that the surface gravity is proportional to its temperature and that the area of its event horizon is proportional to its entropy. -
Gravitational Axial Perturbations and Quasinormal Modes of Loop Quantum Black Holes
Eur. Phys. J. C (2019) 79:157 https://doi.org/10.1140/epjc/s10052-019-6565-2 Regular Article - Theoretical Physics Gravitational axial perturbations and quasinormal modes of loop quantum black holes M. B. Cruz1,a,C.A.S.Silva2,b,F.A.Brito1,3,c 1 Departamento de Física, Universidade Federal da Paraíba, João Pessoa, Paraíba 58051-970, Brazil 2 Instituto Federal de Educação Ciência e Tecnologia da Paraíba (IFPB), Campus Campina Grande-Rua Tranquilino Coelho Lemos 671, Jardim Dinamérica I, João Pessoa, Brazil 3 Departamento de Física, Universidade Federal de Campina Grande, Caixa Postal 10071, Campina Grande 58429-900, Paraíba, Brazil Received: 3 November 2018 / Accepted: 3 January 2019 / Published online: 21 February 2019 © The Author(s) 2019 Abstract Loop quantum gravity (LQG) is a theory that pro- ular, in the context of this theory, a black hole metric known as poses a way to model the behavior of the spacetime in sit- loop quantum black hole (LQBH), or self-dual black hole, has uations where its atomic characteristic arises. Among these been proposed [10,11]. This solution corresponds to a quan- situations, the spacetime behavior near the Big Bang or black tum corrected Schwarzschild solution and possess the inter- hole’s singularity. The detection of gravitational waves, on esting property of self-duality. From this property, the black the other hand, has opened the way to new perspectives in the hole singularity is removed and replaced by another asymp- investigation of the spacetime structure. In this work, by the totically flat region, which is an expected effect in a quantum use of a WKB method introduced by Schutz and Will (Astro- gravity regime. -
Elsevier - Wikipedia
9/23/2020 Elsevier - Wikipedia Elsevier Elsevier (Dutch: [ˈɛlzəviːr]) is a Netherlands-based information and analytics company specializing in scientific, technical, and medical content. It is a part of the RELX Group, known until 2015 as Reed Elsevier. Its products Elsevier include journals such as The Lancet and Cell, the ScienceDirect collection of electronic journals, the Trends and Current Opinion series of journals, the online citation database Scopus, SciVal, a tool that measures research performance, and the ClinicalKey search engine for clinicians. Elsevier's products also include digital tools for data management, instruction, and assessment.[3][4] Elsevier publishes more than about 500,000 articles annually in 2,500 journals.[1] Its archives contain over 17 million documents and 40,000 e-books. Total yearly downloads amount to more than 1 billion.[1] Elsevier's high operating profit margins (37% in 2018) and 950 million pounds in profits, often on publicly funded research works[1][5] and its copyright practices have subjected it to criticism by researchers.[6] Contents Industry Publishing Founded 1880 History Headquarters Amsterdam, Company statistics Netherlands Market model Revenue £2.54 billion Products and services (2018)[1] Research and information ecosystem Net income 600,000,000 United [2] Conferences States dollar Pricing (2009) Shill review offer Number of 6,900 (2008) employees Blocking text mining research Parent RELX Academic practices www.elsevier.com "Who's Afraid of Peer Review" Website (https://www.elsevie Fake -
Immirzi Parameter and Noether Charges in First Order Gravity
Immirzi parameter and Noether charges in first order gravity Remigiusz Durka Institute for Theoretical Physics, University of Wroc law, Pl. Maksa Borna 9, 50-204 Wroc law, Poland E-mail: [email protected] Abstract. The framework of SO(3, 2) constrained BF theory applied to gravity makes it possible to generalize formulas for gravitational diffeomorphic Noether charges (mass, angular momentum, and entropy). It extends Wald’s approach to the case of first order gravity with a negative cosmological constant, the Holst modification and the topological terms (Nieh-Yan, Euler, and Pontryagin). Topological invariants play essential role contributing to the boundary terms in the regularization scheme for the asymptotically AdS spacetimes, so that the differentiability of the action is automatically secured. Intriguingly, it turns out that the black hole thermodynamics does not depend on the Immirzi parameter for the AdS–Schwarzschild, AdS–Kerr, and topological black holes, whereas a nontrivial modification appears for the AdS–Taub–NUT spacetime, where it impacts not only the entropy, but also the total mass. 1. Black hole thermodynamics The discovery of the laws of black hole dynamics [1] has led to uncovering a remarkable analogy between gravity and thermodynamics. This is especially clear in the case of the first law κ dM = dA +ΩdJ (black hole dynamics) dE = T dS + dW (thermodynamics) , (1) 8πG arXiv:1111.0961v2 [gr-qc] 8 Nov 2011 where on the left we have black hole mass M, angular momentum J, angular velocity Ω, area of the event horizon A and surface gravity κ. The seminal works of Bekenstein [2, 3] and Hawking [4], relating the area of the event horizon with the entropy Area Entropy = , where l = G¯h/c3 , (2) 4l2 p p q and the surface gravity of a black hole with its temperature κ T emperature = ¯hc , (3) 2π have strongly suggested that this analogy might be in fact an identity. -
Table of Contents (Print)
PERIODICALS PHYSICAL REVIEW Dä For editorial and subscription correspondence, Postmaster send address changes to: please see inside front cover (ISSN: 1550-7998) APS Subscription Services P.O. Box 41 Annapolis Junction, MD 20701 THIRD SERIES, VOLUME 92, NUMBER 12 CONTENTS D15 DECEMBER 2015 The Table of Contents is a total listing of Parts A and B. Part A consists of articles 121301–124033, and Part B articles 124034–129902(E) PART A RAPID COMMUNICATIONS Hypermagnetic gyrotropy, inflation, and the baryon asymmetry of the Universe (5 pages) ...................................... 121301(R) Massimo Giovannini Beyond six parameters: Extending ΛCDM (5 pages) ................................................................................... 121302(R) Eleonora Di Valentino, Alessandro Melchiorri, and Joseph Silk Searching for features of a string-inspired inflationary model with cosmological observations (6 pages) ..................... 121303(R) Yi-Fu Cai, Elisa G. M. Ferreira, Bin Hu, and Jerome Quintin Primordial black holes as a novel probe of primordial gravitational waves (6 pages) ............................................ 121304(R) Tomohiro Nakama and Teruaki Suyama Kinetically modified nonminimal Higgs inflation in supergravity (6 pages) ........................................................ 121305(R) Constantinos Pallis Local quantum gravity (6 pages) ........................................................................................................... 121501(R) N. Christiansen, B. Knorr, J. Meibohm, J. M. Pawlowski, and M. -
A Note on the Holst Action, the Time Gauge, and the Barbero-Immirzi
A note on the Holst action, the time gauge, and the Barbero-Immirzi parameter Marc Geiller1 and Karim Noui2, 3 1Institute for Gravitation and the Cosmos & Physics Department, Penn State, University Park, PA 16802, U.S.A. 2Laboratoire de Math´ematiques et Physique Th´eorique, Universit´eFran¸cois Rabelais, Parc de Grandmont, 37200 Tours, France 3Laboratoire APC – Astroparticule et Cosmologie, Universit´eParis Diderot Paris 7, 75013 Paris, France In this note, we review the canonical analysis of the Holst action in the time gauge, with a special emphasis on the Hamiltonian equations of motion and the fixation of the Lagrange multipliers. This enables us to identify at the Hamiltonian level the various components of the covariant torsion tensor, which have to be vanishing in order for the classical theory not to depend upon the Barbero-Immirzi parameter. We also introduce a formulation of three-dimensional gravity with an explicit phase space dependency on the Barbero-Immirzi parameter as a potential way to investigate its fate and relevance in the quantum theory. Introduction The Barbero-Immirzi parameter [1, 2] γ plays a rather intriguing role in loop quantum gravity. In the classical theory, this role can be analyzed both at the Lagrangian and at the Hamiltonian level. In the former case, the Barbero-Immirzi parameter is introduced as the coupling constant of a topological1 term that is added to the first order Hilbert-Palatini action in order to obtain the Holst action [3]. This topological term being vanishing once we resolve the torsion-free equations of motion in order to expresses the spin connection in terms of the tetrad, the Barbero-Immirzi parameter drops out of the classical theory in the absence of torsion. -
Global Journal of Science Frontier Research: a Physics & Space Science
Online ISSN : 2249-4626 Print ISSN : 0975-5896 DOI : 10.17406/GJSFR OutlineofRealPhysics QuantumSetTheoryProposal ProgressinPhysicsandCosmology CrystallizationofMagneticMoments VOLUME20ISSUE3VERSION1.0 Global Journal of Science Frontier Research: A Physics & Space Science Global Journal of Science Frontier Research: A Physics & Space Science Volume 20 Issue 3 (Ver. 1.0) Open Association of Research Society Global Journals Inc. © Global Journal of Science (A Delaware USA Incorporation with “Good Standing”; Reg. Number: 0423089) Frontier Research. 2020 . Sponsors:Open Association of Research Society Open Scientific Standards All rights reserved. This is a special issue published in version 1.0 Publisher’s Headquarters office of “Global Journal of Science Frontier Research.” By Global Journals Inc. Global Journals ® Headquarters All articles are open access articles distributed 945th Concord Streets, under “Global Journal of Science Frontier Research” Framingham Massachusetts Pin: 01701, Reading License, which permits restricted use. United States of America Entire contents are copyright by of “Global USA Toll Free: +001-888-839-7392 Journal of Science Frontier Research” unless USA Toll Free Fax: +001-888-839-7392 otherwise noted on specific articles. No part of this publication may be reproduced Offset Typesetting or transmitted in any form or by any means, electronic or mechanical, including G lobal Journals Incorporated photocopy, recording, or any information storage and retrieval system, without written 2nd, Lansdowne, Lansdowne Rd., Croydon-Surrey, permission. Pin: CR9 2ER, United Kingdom The opinions and statements made in this book are those of the authors concerned. Packaging & Continental Dispatching Ultraculture has not verified and neither confirms nor denies any of the foregoing and no warranty or fitness is implied.