Results 31 to 40 of about 67,287 (207)
Quantum Uncertainties of Static Spherically Symmetric Spacetimes
UniverseWe present a canonical quantization framework for static spherically symmetric spacetimes described by the Einstein–Hilbert action with a cosmological constant.
Benjamin Koch, Ali Riahinia
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No fermion doubling in quantum geometry
Physics Letters B, 2015 In loop quantum gravity the discrete nature of quantum geometry acts as a natural regulator for matter theories. Studies of quantum field theory in quantum space–times in spherical symmetry in the canonical approach have shown that the main effect of the
Rodolfo Gambini, Jorge Pullin
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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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Quantum Big-Bounce as a phenomenology of RQM in the Mini-superspace
Physics Letters BWe investigate the emergence of a quantum Big-Bounce in the context of an isotropic Universe, filled by a self-interacting scalar field, which plays the role of a physical clock. The bouncing cosmology is the result of a scattering process, driven by the
Simone Lo Franco, Giovanni Montani
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Quantum imploding scalar fields [PDF]
Royal Society Open Science, 2018 The d’Alembertian □ϕ = 0 has the solution ϕ = f(v)/r, where f is a function of a null coordinate v, and this allows creation of a divergent singularity out of nothing.
Mark D. Roberts
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, 1993 The loop representation plays an important role in canonical quantum gravity because loop variables allow a natural treatment of the constraints. In these lectures we give an elementary introduction to (i) the relevant history of loops in knot theory and
A. Ashtekar +43 more
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Canonical quantum gravity on noncommutative space–time [PDF]
International Journal of Modern Physics A, 2015 In this paper canonical quantum gravity on noncommutative space–time is considered. The corresponding generalized classical theory is formulated by using the Moyal star product, which enables the representation of the field quantities depending on noncommuting coordinates by generalized quantities depending on usual coordinates.
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The Immirzi parameter in quantum general relativity
, 1997 Barbero has generalized the Ashtekar canonical transformation to a one-parameter scale transformation $U(\iota)$ on the phase space of general relativity.
Rovelli, Carlo, Thiemann, Thomas
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Dirac Fields in Loop Quantum Gravity and Big Bang Nucleosynthesis [PDF]
, 2008 Big Bang nucleosynthesis requires a fine balance between equations of state for photons and relativistic fermions. Several corrections to equation of state parameters arise from classical and quantum physics, which are derived here from a canonical ...
C. Rovelli +5 more
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COSMOLOGICAL ISSUES FOR REVISED CANONICAL QUANTUM GRAVITY [PDF]
International Journal of Modern Physics D, 2003 In a recent work1 we presented a reformulation of the canonical quantum gravity, based on adding the so-called kinematical term to the gravity-matter action. This revised approach leads to a self-consistent canonical quantization of the 3-geometries, which referred to the external time as provided via the added term. Here, we show how the kinematical
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