14 research outputs found
Cooling in a Bistable Optical Cavity
We propose a generic approach to nonresonant laser cooling of atoms/molecules
in a bistable optical cavity. The method exemplifies a photonic version of
Sisyphus cooling, in which the matter-dressed cavity extracts energy from the
particles and discharges it to the external field as a result of sudden
transitions between two stable states
Realistic Observable in Background-Free Quantum Gravity: the Planck-Star Tunnelling-Time
We consider this paper important. 17 pages, 13 figuresInternational audienceA gravitationally collapsed object can bounce-out from its horizon via a tunnelling process that violates the classical equations in a finite region. Since tunnelling is a non-perturbative phenomenon, it cannot be described in terms of quantum fluctuations around a classical solution and a background-free formulation of quantum gravity is needed to analyze it. Here we use Loop Quantum Gravity to compute the amplitude for this process, in a first approximation. The amplitude determines the tunnelling time as a function of the mass. This is the key information to evaluate the astrophysical relevance of this process. The calculation offers a template and a concrete example of how a background-free quantum theory of gravity can be used to compute a realistical observable quantity
Realistic Observable in Background-Free Quantum Gravity: the Planck-Star Tunnelling-Time
We consider this paper important. 17 pages, 13 figuresInternational audienceA gravitationally collapsed object can bounce-out from its horizon via a tunnelling process that violates the classical equations in a finite region. Since tunnelling is a non-perturbative phenomenon, it cannot be described in terms of quantum fluctuations around a classical solution and a background-free formulation of quantum gravity is needed to analyze it. Here we use Loop Quantum Gravity to compute the amplitude for this process, in a first approximation. The amplitude determines the tunnelling time as a function of the mass. This is the key information to evaluate the astrophysical relevance of this process. The calculation offers a template and a concrete example of how a background-free quantum theory of gravity can be used to compute a realistical observable quantity