Results 61 to 70 of about 36,776 (204)

On the Nature of Nonperturbative Effects in Stabilized 2D Quantum Gravity

, 1993
We remark that the weak coupling regime of the stochastic stabilization of 2D quantum gravity has a unique perturbative vacuum, which does not support instanton configurations.
Diego, Oscar, Gonzalez, Jose
core   +2 more sources

Nonperturbative effects in the nonrelativistic hadron scattering [PDF]

Physics Letters B, 1997
be published in Phys.Lett ...
openaire   +2 more sources

States of low energy in the Schwinger effect

Journal of High Energy Physics, 2023
States of low energy in cosmology minimise the energy density when smeared in a chosen time interval. We extend such construction to generic homogeneous (possibly anisotropic) particle creation settings.
Álvaro Álvarez-Domínguez, Luis J. Garay, Mercedes Martín-Benito, Rita B. Neves   +3 more
doaj   +1 more source

Combinatorics of Boundaries in String Theory [PDF]

, 1994
We investigate the possibility that stringy nonperturbative effects appear as holes in the world-sheet. We focus on the case of Dirichlet string theory, which we argue should be formulated differently than in previous work, and we find that the effects ...
A. Cohen, A. Cohen, A. Cohen, B. Grinstein, D. J. Gross, D. Lewellen, E. Brézin, E. F. Corrigan, G. Parisi, J. Atick, J. Cardy, J. Dai, J. H. Schwarz, J. Liu, Joseph Polchinski, M. B. Green, M. B. Green, M. B. Green, M. B. Green, M. B. Green, M. B. Green, M. Li, M. R. Douglas, M. R. Douglas, N. Ishibashi, P. Ginsparg, R. Leigh, S. Shenker, W. Fischler, W. Fischler, W. Siegel   +30 more
core   +3 more sources

Hadronic corrections to μ-e scattering at NNLO with space-like data

Journal of High Energy Physics, 2019
The Standard Model prediction for μ-e scattering at Next-to-Next-to-Leading Order (NNLO) contains non-perturbative QCD contributions given by diagrams with a hadronic vacuum polarization insertion in the photon propagator.
Matteo Fael
doaj   +1 more source

Nonperturbative QCD Contributions to the Semileptonic Decay Width of the B Meson [PDF]

, 1996
Nonperturbative QCD contributions to the inclusive semileptonic decay of the B meson consist of the dynamic and kinematic components. We calculate the decay width in an approach based on the light-cone expansion and the heavy quark effective theory ...
A. Bareiss, A. Czarnecki, A. F. Falk, A. F. Falk, A. V. Manohar, B. Blok, C. H. Jin, C. H. Jin, Changhao Jin, G. Altarelli, G. Martinelli, I. Bigi, I. I. Bigi, I. I. Bigi, I. I. Bigi, I.I. Bigi, J. Chay, K. Y. Lee, M. Gremm, M. Gremm, M. Luke, M. Luke, M. Neubert, M. Neubert, M. Shifman, N. Cabibbo, P. Ball, P. Ball, P. Ball, T. Mannel, T. Skwarnicki, V. Chernyak, Y. Nir   +32 more
core   +4 more sources

Superradiance and Broadband Emission Driving Fast Electron Dephasing in Open Quantum Systems

Advanced Science, EarlyView.
We uncover the physical origin of ultrafast electron dephasing in solid‐state high‐harmonic generation by simulating the Lindblad equation for the dissipative Hubbard model. Coexistence of Dicke superradiance and broadband emission is revealed, whose destructive interference shortens the effective scattering time and provides a unified picture of ...
Gimin Bae, Youngjae Kim, Jae Dong Lee
wiley   +1 more source

Nonperturbative infrared effects for light scalar fields in de Sitter space

, 2012
We study the phi^4 scalar field theory in de Sitter space using the 2PI effective action formalism. This formalism enables us to investigate the nonperturbative quantum effects.
Brunier T, Lenaghan J T, Onemli V K, Prokopec T, Riotto A, Takashi Arai   +5 more
core   +1 more source

Interaction of Wilson loops in confining vacuum [PDF]

, 2002
Nonperturbative and perturbative interaction mechanisms of Wilson loops in gluodynamics are studied within the background field formalism. The first one operates when distance between minimal surfaces of the loops is small and may be important for sea ...
A. B. Kaidalov, A. Bialas, A. Di Giacomo, A. Di Giacomo, A. Kramer, A. Mueller, A. Y. Dubin, B. S. De Witt, B. S. De Witt, E. A. Kuraev, F. E. Low, G. Chew, H. G. Dosch, H. G. Dosch, H. G. Dosch, H. G. Dosch, J. Honerkamp, K. G. Wilson, L. F. Abbott, L. Lukaszuk, M. E. Peskin, N. Nikolaev, N. Nikolaev, O. Nachtmann, S. Nussinov, S. V. Ivanov, S. V. Ivanov, V. Gribov, V. I. Shevchenko, V. I. Shevchenko, V. I. Shevchenko, Y. A. Simonov, Y. A. Simonov, Y. A. Simonov, Y. A. Simonov, Ya. Ya. Balitsky, Yu. A. Simonov, Yu. A. Simonov   +37 more
core   +4 more sources

Nonperturbative effects in heavy quarkonia

, 1994
An effective hamiltonian for heavy quarkonia is derived from QCD by separating gluonic fields in background and quantum fields and neglecting anharmonic contributions. Mesonic states with nonperturbative gluonic components are constructed. These states are invariant under gauge changes of the background fields and form an orthogonal basis.
Nunes, C. A. A., Navarra, F. S., Ring, P., Schaden, M.   +3 more
openaire   +2 more sources