Results 111 to 120 of about 36,882 (207)

Off-shell structure of the string sigma model

, 1999
The off-shell structure of the string sigma model is investigated. In the open bosonic string, nonperturbative effects are shown to depend crucially on the regularization scheme.
Kostelecky, Alan, Perry, Malcolm, Potting, Robertus   +2 more
core   +1 more source

Limits of TMD evolution in SIDIS at moderate Q

EPJ Web of Conferences, 2015
We investigate semi-inclusive deep inelastic scattering measurements in the region of relatively small Q, where sensitivity to nonperturbative transverse momentum dependence can dominate the evolution.
Gamberg Leonard
doaj   +1 more source

Dynamical $F(R)$ gravities

, 2012
It is offered that $F(R)-$modified gravities can be considered as nonperturbative quantum effects arising from Einstein gravity. It is assumed that nonperturbative quantum effects gives rise to the fact that the connection becomes incompatible with the ...
Buchbinder I. L., Heisenberg W., VLADIMIR DZHUNUSHALIEV   +2 more
core   +1 more source

Reducible contributions to quantum electrodynamics in external fields

Journal of High Energy Physics, 2019
We consider one-particle reducible (1PR) contributions to QED and scalar QED processes in external fields, at one-loop and two-loop order. We investigate three cases in detail: constant crossed fields, constant magnetic fields, and plane waves.
Naser Ahmadiniaz, James P. Edwards, Anton Ilderton   +2 more
doaj   +1 more source

Nonperturbative effects in gluodynamics at T ≥ Tc

Physics Letters B, 1995
Abstract Contributions to gluon thermodynamics at temperature T > 0 due to a non-perturbative background field are calculated. The free energy is written as a double series in 1 N c and the strong coupling gs. The leading order contribution due to gluon loops in the nonperturbative background field contains explicitly the expectation ...
H.G Dosch, H.J Pirner, Yu.A Simonov
openaire   +1 more source

Quantum fermion superradiance and vacuum ambiguities on charged black holes

Journal of High Energy Physics
Unlike a classical charged bosonic field, a classical charged fermion field on a static charged black hole does not exhibit superradiant scattering. We demonstrate that the quantum analogue of this classical process is however present.
Álvaro Álvarez-Domínguez, Elizabeth Winstanley   +1 more
doaj   +1 more source

Electroweak vacuum stability in the Higgs-Dilaton theory

Journal of High Energy Physics, 2017
We study the stability of the Electroweak (EW) vacuum in a scale-invariant extension of the Standard Model and General Relativity, known as a Higgs-Dilaton theory.
A. Shkerin
doaj   +1 more source

Tadpole diagrams in constant electromagnetic fields

Journal of High Energy Physics, 2017
We show how all possible one-particle reducible tadpole diagrams in constant electromagnetic fields can be constructed from one-particle irreducible constant-field diagrams.
Felix Karbstein
doaj   +1 more source

Universality of Nonperturbative Effects in Event Shapes

, 2006
4 pages; to appear in the Proceedings of the FRIF Workshop on First Principles Non-Perturbative QCD of Hadron Jets (Paris, 12-14 January 2006); ReVTeX4, uses slac_one.rtx (included)
Lee, Christopher, Sterman, George
openaire   +2 more sources

Squeezing, chaos and thermalization in periodically driven quantum systems: the case of bosonic preheating

Journal of High Energy Physics
The phenomena of Squeezing and chaos have recently been studied in the context of inflation. We apply this formalism in the post-inflationary preheating phase.
Ayan Chakraborty, Debaprasad Maity
doaj   +1 more source