TIME AND INTERPRETATIONS OF QUANTUM GRAVITY

By K. Kuchař. 2011

740 citations recorded by the source corpus.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/c923a8606137ec14dddcbaab4c32620606373f19

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Citations in the corpus

Constructing local bulk observables in interacting AdS/CFT (2011, background): “One might be surprised that such a construction could be carried out at all, since the diffeomorphism constraints of quantum gravity would seem to rule out the existence of local observables [1,2].”
Quantum Time (2015, methodology): “This is true also for two-time correlation functions and propagators [6]; (iii) no dynamical variable can correlate monotonically with ‘Heraclitian’ time if the Hamiltonian is lower bounded; (iv) only time is appropriate for conditioning the state: for example, space may be inappropriate for setting”
Quantum nature of the big bang: An analytical and numerical investigation (2006, background): “In particular, a major part of a conference proceedings [64] was devoted to it in the late eighties and several exhaustive reviews also appeared in the nineties (see in particular [65, 66]).”
Threshold effects and Planck scale Lorentz violation: Combined constraints from high-energy astrophysics (2002, background): “Profound difficulties associated with the “problem of time” in quantum gravity [2, 3] have suggested that an underlying preferred time may be necessary to make sense of this physics.”
Partial and complete observables for Hamiltonian constrained systems (2004, background): “For systems with one constraint such a differential equation for a complete observable appeared in [10].”
Loop quantum gravity: an outside view (2005, background): “Although there has been much discussion in the literature about these ‘relational’ aspects (see [16, 30, 31, 34] and references therein, and [105, 106] for a more recent discussion in the context of LQG), these issues are by no means conclusively settled, and we are not aware of any fully concrete r”
Loop Quantum Cosmology (2005, background): “There are interpretational issues of the wave function obtained as a solution to the constraints, and also the problem of time or observables emerges [143].”
Membranes at Quantum Criticality (2008, neutral): “, [31, 32]).”
Lorentz violation at high energy: Concepts, phenomena, and astrophysical constraints (2005, background): “Profound difficulties associated with the “problem of time” in quantum gravity [1,2] have suggested that an underlying preferred time may be necessary to make sense of this physics, and general arguments suggest radical departures from standard spacetime symmetries at the Planck scale [3].”
The teleparallel equivalent of general relativity (2013, background): “After this transformation, one would expect the constraints to be written as HA = PA + hA = 0, (A = 0, 1, 2, 3), where PA is the embedding momenta and hA is the gravitational energy density and energy flux carried by the true gravitational degrees of freedom [48].”
Quantum Gravity at a Lifshitz Point (2009, background): “In particular, various aspects of the “problem of time” [41,42] traditionally associated with the attempts to quantize general relativity are eliminated: The preferred foliation of spacetime leads to an invariant notion of time, susceptible only to time-dependent reparametrizations.”
Observables in effective gravity (2005, background): “Kuchař [1] has argued that this suffers from a reductio ad absurdum; a counterargument has recently been proposed in [12].”
Isotropic loop quantum cosmology (2002, methodology): “For this we need to write the constraint equation Ĥ|s〉 = 0 for a history |s〉 as an evolution equation which can only be done in a dreibein, rather than connection, representation since we are using a metrical expression as internal time [29, 13].”