Jonathan Engle

Florida Atlantic University, Physics, Faculty Member

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Parthasarathi Majumdar

Romesh Kaul

Daniele Pranzetti

SISSA

Olivera Mišković

Pontificia Universidad Catolica de Valparaiso

Georgios Kofinas

Enrique F. Borja

Universidad de Sevilla

Jerzy Lewandowski

Máximo Bañados

Rene Meyer

SUNY: Stony Brook University

Christian Röken

Rheinische Friedrich-Wilhelms-Universität Bonn

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Papers by Jonathan Engle

The SU(2) black hole entropy revisited

by Daniele Pranzetti and Jonathan Engle

Journal of High Energy Physics, 2011

We study the state-counting problem that arises in the SU (2) black hole entropy calculation in l... more We study the state-counting problem that arises in the SU (2) black hole entropy calculation in loop quantum gravity. More precisely, we compute the leading term and the logarithmic correction of both the spherically symmetric and the distorted SU (2) black holes. Contrary to what has been done in previous works, we have to take into account "quantum corrections" in our framework in the sense that the level k of the Chern-Simons theory which describes the black hole is finite and not sent to infinity. Therefore, the new results presented here allow for the computation of the entropy in models where the quantum group corrections are important. * Fédération Denis Poisson Orléans-Tours, CNRS/UMR 6083 † Unité Mixte de Recherche (UMR 6207) du CNRS et des Universités Aix-Marseille I, Aix-Marseille II, et du Sud Toulon-Var; laboratoire afiliéà la FRUMAM (FR 2291)

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Asymptotics and Hamiltonians in a first-order formalism

by Abhay Ashtekar and Jonathan Engle

Classical and Quantum Gravity, 2008

We consider 4-dimensional space-times which are asymptotically flat at spatial infinity and show ... more We consider 4-dimensional space-times which are asymptotically flat at spatial infinity and show that, in the first order framework, action principle for general relativity is well-defined without the need of infinite counter terms. It naturally leads to a covariant phase space in which the Hamiltonians generating asymptotic symmetries provide the total energy-momentum and angular momentum of the space-time. We address the subtle but important problems that arise because of logarithmic translations and super-translations both in the Langrangian and Hamiltonian frameworks. As a forthcoming paper will show, the treatment of higher dimensions is considerably simpler. Our first order framework also suggests a new direction for generalizing the spectral action of non-commutative geometry.

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Asymptotics and Hamiltonians in a first-order formalism

by Abhay Ashtekar and Jonathan Engle

Classical and Quantum Gravity, 2008

We consider four-dimensional spacetimes which are asymptotically flat at spatial infinity and sho... more We consider four-dimensional spacetimes which are asymptotically flat at spatial infinity and show that, in the first-order framework, the action principle for general relativity is well defined without the need of infinite counter terms. It naturally leads to a covariant phase space in which the Hamiltonians generating asymptotic symmetries provide the total energy momentum and angular momentum of the spacetime.

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Multipole moments of isolated horizons

by Abhay Ashtekar and Jonathan Engle

Classical and Quantum Gravity, 2004

To every axi-symmetric isolated horizon we associate two sets of numbers, Mn and Jn with n = 0, 1... more To every axi-symmetric isolated horizon we associate two sets of numbers, Mn and Jn with n = 0, 1, 2, ..., representing its mass and angular momentum multipoles. They provide a diffeomorphism invariant characterization of the horizon geometry. Physically, they can be thought of as the 'source multipoles' of black holes in equilibrium. These structures have a variety of potential

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LETTER TO THE EDITOR: Quantum horizons and black-hole entropy: inclusion of distortion and rotation

by Jonathan Engle and Abhay Ashtekar

Classical and Quantum Gravity, 2005

Equilibrium states of black holes can be modelled by isolated horizons. If the intrinsic geometry... more Equilibrium states of black holes can be modelled by isolated horizons. If the intrinsic geometry is spherical, they are called type I while if it is axi-symmetric, they are called type II. The detailed theory of the geometry of quantum type I horizons and the calculation of their entropy can be generalized to type II, thereby including arbitrary distortions and

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The SU(2) black hole entropy revisited

by Daniele Pranzetti and Jonathan Engle

Journal of High Energy Physics, 2011

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Asymptotics and Hamiltonians in a first-order formalism

by Abhay Ashtekar and Jonathan Engle

Classical and Quantum Gravity, 2008

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Asymptotics and Hamiltonians in a first-order formalism

by Abhay Ashtekar and Jonathan Engle

Classical and Quantum Gravity, 2008