Results 61 to 70 of about 11,408,683 (276)

Topology in full QCD at high temperature: a multicanonical approach

Journal of High Energy Physics, 2018
We investigate the topological properties of N f = 2 + 1 QCD with physical quark masses, at temperatures around 500 MeV. With the aim of obtaining a reliable sampling of topological modes in a regime where the fluctuations of the topological charge Q are
Claudio Bonati, Massimo D’Elia, Guido Martinelli, Francesco Negro, Francesco Sanfilippo, Antonino Todaro   +5 more
doaj   +1 more source

Tunnelling of charged particles from black holes

Journal of High Energy Physics, 2020
We state and explain the total rate at which a charged non-rotating black hole emits charged particles, taking into account both Hawking radiation and Schwinger pair production simultaneously.
George Johnson
doaj   +1 more source

The axion quality problem: global symmetry breaking and wormholes

Journal of High Energy Physics, 2021
Continuous global symmetries are expected to be broken by gravity, which can lead to important phenomenological consequences. A prime example is the threat that this poses to the viability of the Peccei-Quinn solution to the strong CP problem.
James Alvey, Miguel Escudero
doaj   +1 more source

Nonperturbative and perturbative aspects of photo- and electroproduction of vector mesons [PDF]

, 2006
We discuss various aspects of vector meson production, first analysing the interplay between perturbative and nonperturbative aspects of the QCD calculation.
A. Aktas, A. Donnachie, A. Donnachie, A. Donnachie, A. Donnachie, A. Donnachie, A. Donnachie, A. Giacomo Di, A.D. Martin, B. Blaettel, B.H. Denby, B.Z. Kopeliovich, B.Z. Kopeliovich, C. Adloff, C. Adloff, C. Adloff, C. Adloff, E. Ferreira, E. Ferreira, E. Gotsman, E. Gotsman, E. Gotsman, E. Iancu, E. Martynov, G. Dosch, G. Kulzinger, G.P. Lepage, H. Kowalski, H. Kowalski, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, H.G. Dosch, J. Ashman, J. Bartels, J. Breitweg, J. Breitweg, J. Breitweg, J. Breitweg, J. Breitweg, J. Busenitz, J.J. Aubert, J.R. Forshaw, J.R. Forshaw, K. Golec-Biernat, K. Golec-Biernat, L. Frankfurt, L. Frankfurt, M. Arneodo, M. Bauer, M. Bauer, M. Binkley, M. Derrick, M. Derrick, M. Derrick, M. D’Elia, M.G. Ryskin, M.G. Ryskin, M.R. Adams, O. Nachtmann, P. Amaudruz, R. Fiore, R.M. Egloff, S. Aid, S. Chekanov, S. Chekanov, S. Chekanov, S.J. Brodsky, S.J. Brodsky, W.D. Shambroom   +74 more
core   +3 more sources

Vacuum instability due to the creation of neutral fermion with anomalous magnetic moment by magnetic-field inhomogeneities

Journal of High Energy Physics, 2021
We study neutral fermions pair creation with anomalous magnetic moment from the vacuum by time-independent magnetic-field inhomogeneity as an external background. We show that the problem is technically reduced to the problem of charged-particle creation
T. C. Adorno, Zi-Wang He, S. P. Gavrilov, D. M. Gitman   +3 more
doaj   +1 more source

Asymptotic charges, large gauge transformations and inequivalence of different gauges in external current QED

Journal of High Energy Physics, 2019
In this paper we consider external current QED in the Coulomb gauge and in axial gauges for various spatial directions of the axis. For a non-zero electric charge of the current, we demonstrate that any two different gauges from this class correspond to ...
Wojciech Dybalski, Benedikt Wegener
doaj   +1 more source

Nonperturbative versus perturbative effects in generalized parton distributions [PDF]

, 2004
Generalized parton distributions (GPDs) are studied at the hadronic (nonperturbative) scale within different assumptions based on a relativistic constituent quark model.
A. Mair, A. V. Belitsky, A. V. Belitsky, A. V. Radyushkin, A. W. Thomas, B. Pasquini, D. Diakonov, E. Witten, G. Altarelli, G. Parisi, H. Holtmann, J. Speth, M. Diehl, M. Glück, M. Glück, M. Traini, M. Traini, P. Faccioli, R. L. Jaffe, R. P. Feynman, S. Boffi, S. Boffi, S. Boffi, T. Weigl, V. R. Zoller, V. R. Zoller   +25 more
core   +2 more sources

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

Regularization in nonperturbative extensions of effective field theory

Physical Review D, 2022
The process of renormalisation in nonperturbative Hamiltonian Effective Field Theory (HEFT) is examined in the $Δ$-resonance scattering channel. As an extension of effective field theory incorporating the Lüscher formalism, HEFT provides a bridge between the infinite-volume scattering data of experiment and the finite-volume spectrum of energy ...
Curtis D. Abell, Derek B. Leinweber, Anthony W. Thomas, Jia-Jun Wu   +3 more
openaire   +3 more sources

Exploring the θ-vacuum structure in the functional renormalization group approach

Journal of High Energy Physics, 2022
We investigate the θ-vacuum structure and the ’t Hooft anomaly at θ = π in a simple quantum mechanical system on S 1 to scrutinize the applicability of the functional renormalization group (fRG) approach.
Kenji Fukushima, Takuya Shimazaki, Yuya Tanizaki   +2 more
doaj   +1 more source