Results 61 to 70 of about 12,791 (220)

Absorption and unbounded superradiance in a static regular black hole spacetime [PDF]

Physical Review D
Regular black holes (RBHs) -- geometries free from curvature singularities -- arise naturally in theories of non linear electrodynamics. Here we study the absorption, and superradiant amplification, of a monochromatic planar wave in a charged, massive ...
M. A. D. de Paula, L. C. Leite, S. Dolan, L. Crispino   +3 more
semanticscholar   +1 more source

Multimode Collective Atomic Recoil Lasing in Free Space

Atoms, 2020
Cold atomic clouds in collective atomic recoil lasing are usually confined by an optical cavity, which forces the light-scattering to befall in the mode fixed by the resonator.
Angel T. Gisbert, Nicola Piovella
doaj   +1 more source

Effects of interatomic interaction on cooperative relaxation of two-level atoms [PDF]

, 2006
We study effects of direct interatomic interaction on cooperative processes in atom-photon dynamics. Using a model of two-level atoms with Ising-type interaction as an example, it is demonstrated that interparticle interaction combined with atom-field ...
A. H. Nayfeh, B. E. Pobedrya, C. Kittel, D. M. Greenberg, Dmytro A. Bevzenko, E. M. Chudnovsky, G. A. Skorobogatov, H. Bateman, H. Carmichael, L. Allen, N. F. Mott, N. N. Bogolubov, Jr., N. N. Bogolubov, Jr., R. Blinc, S. Sachdev, S. V. Tyablikov, Sergei P. Lukyanets, U. Kh. Kopvillem, V. I. Yukalov, W. H. Louisell   +19 more
core   +2 more sources

CFT description of BH’s and ECO’s: QNMs, superradiance, echoes and tidal responses [PDF]

Journal of High Energy Physics, 2022
Using conformal field theory and localization tecniques we study the propagation of scalar waves in gravity backgrounds described by Schrödinger like equations with Fuchsian singularities.
D. Consoli, F. Fucito, J. F. Morales, R. Poghossian   +3 more
semanticscholar   +1 more source

Room-temperature spontaneous superradiance from single diamond nanocrystals

Nature Communications, 2017
Previously, superradiance was observed from sizeable crystals or close to liquid-helium temperatures. Here, Bradec et al. report the observation of room-temperature superradiance from single, highly luminescent diamond nanocrystals with spatial ...
Carlo Bradac, Mattias T. Johnsson, Matthew van Breugel, Ben Q. Baragiola, Rochelle Martin, Mathieu L. Juan, Gavin K. Brennen, Thomas Volz   +7 more
doaj   +1 more source

Superradiant Quantum Phase Transition for an Exactly Solvable Two-Qubit Spin-Boson Model

Entropy, 2023
A spin-boson-like model with two interacting qubits is analysed. The model turns out to be exactly solvable since it is characterized by the exchange symmetry between the two spins.
Roberto Grimaudo, Davide Valenti, Alessandro Sergi, Antonino Messina   +3 more
doaj   +1 more source

Duality between Seiberg-Witten theory and black hole superradiance [PDF]

Journal of High Energy Physics
The newly established Seiberg-Witten (SW)/Quasinormal Modes (QNM) correspondence offers an efficient analytical approach to calculate the QNM frequencies, which was only available numerically before.
Xian-Hui Ge, Masataka Matsumoto, Kilar Zhang   +2 more
semanticscholar   +1 more source

Scalar perturbations around rotating regular black holes and wormholes: Quasinormal modes, ergoregion instability, and superradiance [PDF]

Physical Review D, 2022
We study scalar test-field perturbations on top of a Kerr--black-bounce background, i.e. a family of rotating regular black holes and/or rotating traversable wormholes that can mimic Kerr black holes.
Edgardo Franzin, S. Liberati, J. Mazza, Ramit Dey, S. Chakraborty   +4 more
semanticscholar   +1 more source

Superradiance without inversion in a cavity: Effects of cavity losses and relaxation in the system of emitters

EPJ Web of Conferences, 2017
We investigate theoretically inversionless superradiance of an ensemble of three-level emitters (with Λ-scheme of operating transition), placed in a cyclic cavity.
Ryzhov Igor, Vasil'ev Nikolai, Malyshev Victor   +2 more
doaj   +1 more source

Directional Superradiance in a Driven Ultracold Atomic Gas in Free Space [PDF]

PRX Quantum
Ultracold atomic systems are among the most promising platforms that have the potential to shed light on the complex behavior of many-body quantum systems. One prominent example is the case of a dense ensemble illuminated by a strong coherent drive while
Sanaa Agarwal, Edwin Chaparro, D. Barberena, A. Orioli, G. Ferioli, S. Pancaldi, I. Ferrier-Barbut, A. Browaeys, A. M. Rey   +8 more
semanticscholar   +1 more source