Results 151 to 160 of about 2,110,870 (239)

Quantum histories and quantum gravity

open access: yesJournal of Physics: Conference Series, 2009
This paper reviews the histories approach to quantum mechanics. This discussion is then applied to theories of quantum gravity. It is argued that some of the quantum histories must approximate (in a suitable sense) to classical histories, if the correct classical regime is to be recovered.
openaire   +2 more sources

Deep Learning Spinfoam Vertex Amplitudes: The Euclidean Barrett–Crane Model

open access: yesUniverse
Spinfoam theories propose a well-defined path-integral formulation for quantum gravity, and it is hoped that they will provide the dynamics of loop quantum gravity. However, it is computationally hard to calculate spinfoam amplitudes.
Hanno Sahlmann, Waleed Sherif
doaj   +1 more source

Quantum Field Theory of Black Hole Perturbations with Backreaction: I General Framework

open access: yesUniverse
In a seminal work, Hawking showed that natural states for free quantum matter fields on classical spacetimes that solve the spherically symmetric vacuum Einstein equations are KMS states of non-vanishing temperature.
Thomas Thiemann
doaj   +1 more source

Combining complex Langevin dynamics with score-based and energy-based diffusion models

open access: yesJournal of High Energy Physics
Theories with a sign problem due to a complex action or Boltzmann weight can sometimes be numerically solved using a stochastic process in the complexified configuration space.
Gert Aarts   +3 more
doaj   +1 more source

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