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International Journal of Modern Physics D, 2017 The search for a theory of quantum gravity is the most fundamental problem in all of theoretical physics, but there are as yet no experimental results at all to guide this endeavor. What seems to be needed is a pragmatic way to test if gravitation really occurs between quantum objects or not.
Hansson, Johan, Francois, Stephane
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Bohmian quantum gravity and cosmology
, 2019 Quantum gravity aims to describe gravity in quantum mechanical terms. How exactly this needs to be done remains an open question. Various proposals have been put on the table, such as canonical quantum gravity, loop quantum gravity, string theory, etc ...
Pinto-Neto, Nelson, Struyve, Ward
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Coherent States for Fractional Powers of the Harmonic Oscillator Hamiltonian
Universe, 2021 Inspired by special and general relativistic systems that can have Hamiltonians involving square roots or more general fractional powers, in this article, we address the question of how a suitable set of coherent states for such systems can be obtained ...
Kristina Giesel, Almut Vetter
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Testing loop quantum cosmology [PDF]
, 2017 Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can also modify the form of primordial cosmological perturbations, for example by ...
Wilson-Ewing, Edward
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Foundations of Physics, 2019 This paper elaborates on an intrinsically quantum approach to gravity, which begins with a general framework for quantum mechanics and then seeks to identify additional mathematical structure on Hilbert space that is responsible for gravity and other phenomena.
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Quantum Gravity: Has Spacetime Quantum Properties? [PDF]
, 2009 The incompatibility between GR and QM is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argumentation - QM gives a universally valid basis for the description of all natural systems, then ...
Hedrich, Reiner
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Finite field-dependent symmetries in perturbative quantum gravity
, 2013 In this paper we discuss the absolutely anticommuting nilpotent symmetries for perturbative quantum gravity in general curved spacetime in linear and non-linear gauges.
Upadhyay, Sudhaker
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Emergence of string-like physics from Lorentz invariance in loop quantum gravity [PDF]
, 2014 We consider a quantum field theory on a spherically symmetric quantum space time described by loop quantum gravity. The spin network description of space time in such a theory leads to equations for the quantum field that are discrete.
Gambini, Rodolfo, Pullin, Jorge
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International Journal of Modern Physics D, 2007 We present the current status of the new approach to quantum general relativity based on the exact resummation of its perturbative series as this series was formulated by Feynman. We show that the resummed theory is UV-finite and we present some phenomenological applications as well.
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Physics Letters B, 2013 6 pages, 2 figures, version to appear in ...
Henz, T. +3 more
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