Results 111 to 120 of about 36,776 (204)

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

Laser‐Driven Charge‐Transfer Dynamics in the Quaterthiophene–Fullerene Donor/Acceptor Interface

ChemPhotoChem, Volume 9, Issue 11, November 11, 2025.
This ab initio study investigates laser‐induced charge‐transfer in a quaterthiophene/fullerene complex at varying intensities of the external pulse. Pulses above 3 GW cm−2 are needed to trigger charge transfer, which is enabled by vibrations in the donor. Under stronger field intensities, transient effects in the system prevail.
Jannek Räder, Caterina Cocchi, Michele Guerrini   +2 more
wiley   +1 more source

Elliptic genus derivation of 4d holomorphic blocks

Journal of High Energy Physics, 2018
We study elliptic vortices on ℂ × T 2 by considering the 2d quiver gauge theory describing their moduli spaces. The elliptic genus of these moduli spaces is the elliptic version of vortex partition function of the 4d theory. We focus on two examples: the
Matteo Poggi
doaj   +1 more source

Nonperturbative effects in the proton sea

, 1999
We revisit the evaluation of the pionic mechanism of the $\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is based on the unitarity relation between contributions of different mechanisms to the inclusive particle production and the total photoabsorption cross-section (i.e. the proton structure function).
Schäfer, W., Speth, J.
openaire   +2 more sources

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

Instanton effects in quark form factor and quark-quark scattering at high energy

, 2004
The nonperturbative effects in the high-energy processes involving strongly interacting particles are studied within the instanton liquid model of the QCD vacuum (ILM) by using the Wilson integral framework.
't Hooft, A.E. Dorokhov, Andrei, Anikin, Balitsky, Balitsky, Barbieri, Bassetto, Baulieu, Belitsky, Belokurov, Beneke, Beneke, Bonciani, Bozzi, Brandt, Brandt, Callan, Catani, Cherednikov, Collins, Collins, Cornwall, Curci, D'Elia, Dahmen, Diakonov, Dokshitzer, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dorokhov, Dotsenko, Ermolaev, Ermolaev, Ermolaev, Fadin, Fishbane, Frenkel, Frenkel, Gatheral, Gellas, Hasenfratz, I.O. Cherednikov, Ivanov, Ivanov, Jackiw, Karanikas, Kharzeev, Kochelev, Korchemskaya, Korchemskaya, Korchemsky, Korchemsky, Korchemsky, Korchemsky, Korchemsky, Korchemsky, Kuraev, Landshoff, Low, Magnea, Magnea, Makeenko, Mastrolia, Meggiolaro, Mikhailov, Moch, Morris, Mueller, Mueller, Nachtmann, Nachtmann, Nowak, Nussinov, Parisi, Petronzio, Poggio, Polyakov, Qiu, Ringwald, Schrempp, Schrempp, Schäfer, Sen, Shifman, Shirkov, Shuryak, Shuryak, Simula, Stefanis, Sudakov, Zakharov   +97 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

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

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

Complex eigenvalue instantons and the Fredholm determinant expansion in the Gross-Witten-Wadia model

Journal of High Energy Physics
We study the leading nonperturbative corrections to the strong-coupling (ungapped) phase of the Gross-Witten-Wadia (GWW) integral over unitary matrices, to one-loop order.
Dan Stefan Eniceicu, Raghu Mahajan, Chitraang Murdia   +2 more
doaj   +1 more source