Results 81 to 90 of about 591,643 (217)

Spontaneously broken spacetime symmetries and the role of inessential Goldstones

Journal of High Energy Physics, 2017
In contrast to internal symmetries, there is no general proof that the coset construction for spontaneously broken spacetime symmetries leads to universal dynamics.
Remko Klein, Diederik Roest, David Stefanyszyn   +2 more
doaj   +1 more source

Stochastic gravity: beyond semiclassical gravity [PDF]

Journal of Physics: Conference Series, 2007
The back-reaction of a classical gravitational field interacting with quantum matter fields is described by the semiclassical Einstein equation, which has the expectation value of the quantum matter fields stress tensor as a source. The semiclassical theory may be obtained from the quantum field theory of gravity interacting with N matter fields in the
openaire   +2 more sources

Spontaneous symmetry breaking in tensor theories

Journal of High Energy Physics, 2019
In this work we study spontaneous symmetry breaking patterns in tensor models. We focus on the patterns which lead to effective matrix theories transforming in the adjoint of U(N).
P. Diaz, J. A. Rosabal
doaj   +1 more source

Presentism and Quantum Gravity [PDF]

, 2001
There is a philosophical tradition of arguing against presentism, the thesis that only presently existing things exist, on the basis of its incompatibility with fundamental physics.
Monton, Bradley
core  

Krylov complexity and spectral form factor for noisy random matrix models

Journal of High Energy Physics, 2023
We study the spectral properties of two classes of random matrix models: non-Gaussian RMT with quartic and sextic potentials, and RMT with Gaussian noise. We compute and analyze the quantum Krylov complexity and the spectral form factor for both of these
Arpan Bhattacharyya, S. Shajidul Haque, Ghadir Jafari, Jeff Murugan, Dimakatso Rapotu   +4 more
doaj   +1 more source

Time in quantum gravity [PDF]

, 2012
Quantum gravity--the marriage of quantum physics with general relativity--is bound to contain deep and important lessons for the nature of physical time.
Vistarini, Tiziana, Tiziana Vistarini, Christian Wüthrich, Wuthrich, Christian, Huggett, Nick, Nick Huggett   +5 more
core   +1 more source

GOCE data evidence underplating beneath the Paraná basin

, 2012
The Paraná basin in the stable South American Platform accumulated a thick sediment layer during the Paleozoic, with more than 3500 m thickness. In Early Cretaceous the same area experienced a flood basalt volcanism which produced a LIP-(Large Igneous ...
MARIANI, PATRIZIA, BRAITENBERG, CARLA, Ussami, N.   +2 more
core  

An algebraic classification of exceptional EFTs. Part II. Supersymmetry

Journal of High Energy Physics, 2019
We present a novel approach to classify supersymmetric effective field theories (EFTs) whose scattering amplitudes exhibit enhanced soft limits. These enhancements arise due to non-linearly realised symmetries on the Goldstone modes of such EFTs and we ...
Diederik Roest, David Stefanyszyn, Pelle Werkman   +2 more
doaj   +1 more source

Charting GLOBs in asymptotically safe gravity

Journal of High Energy Physics
Computing the gravitational effective action provides a direct route to charting the landscape of admissible black hole spacetimes and their alternatives, which we will collectively call “gravitationally localized objects” (GLOBs).
Francesco Del Porro, Jonas Pfeiffer, Alessia Platania, Samuele Silveravalle   +3 more
doaj   +1 more source

Non-perturbative 3d Lorentzian quantum gravity [PDF]

, 2001
We have recently introduced a discrete model of Lorentzian quantum gravity, given as a regularized non-perturbative state sum over simplicial Lorentzian spacetimes, each possessing a uniqueWick rotation to Euclidean signature.
Ambj¢rn, J., Ambjørn, J., Loll, Renate, Ambjörn, Jan, Jurkiewicz, J., Dep Natuurkunde, Ambjørn, Jan, Quantum Gravity, Strings and Elementary Particles, Ambjörn, J., Jurkiewicz, Jerzy, Loll, R., Universiteit Utrecht   +11 more
core   +2 more sources