Laser intensity effects in noncommutative QED (2009)
Heinzl, Thomas, Ilderton, Anton, Marklund, Mattias
We discuss a two-fold extension of QED assuming the presence of strong external fields provided by an ultra-intense laser and noncommutativity of spacetime. While noncommutative effects leave the...
Noncommutativity and the lightfront (2009)
Heinzl, Thomas, Ilderton, Anton, Marklund, Mattias
We discuss various limits which transform configuration space into phase space, with emphasis on those related to lightfront field theory, and show that they are unified by spectral flow. Examples...
Signatures of High-Intensity Compton Scattering (2009)
Harvey, Chris, Heinzl, Thomas, Ilderton, Anton
We review known and discuss new signatures of high-intensity Compton scattering assuming a scenario where a high-power laser is brought into collision with an electron beam. At high intensities one...
Exploring high-intensity QED at ELI (2008)
Heinzl, Thomas, Ilderton, Anton
We give a non-technical overview of QED effects arising in the presence of ultra-strong electromagnetic fields highlighting the new prospects provided by a realisation of the ELI laser facility.
Extreme field physics and QED (2008)
Heinzl, Thomas, Ilderton, Anton
We give a brief overview of the most important QED effects that can be studied in the presence of extreme fields such as those expected at the Vulcan laser upgraded to a power of 10 Petawatts.
Inverse Monte-Carlo and Demon Methods for Effective Polyakov Loop Models of SU(N)-YM (2008)
Wozar, Christian, Kaestner, Tobias, Wellegehausen, Bjoern H., Wipf, Andreas, Heinzl, Thomas
We study effective Polyakov loop models for SU(N) Yang-Mills theories at finite temperature. In particular effective models for SU(3) YM with an additional adjoint Polyakov loop potential are...
The ice-limit of Coulomb gauge Yang-Mills theory (2008)
Heinzl, Thomas, Ilderton, Anton, Langfeld, Kurt, Lavelle, Martin, McMullan, David
In this paper we describe gauge invariant multi-quark states generalising the path integral framework developed by Parrinello, Jona-Lasinio and Zwanziger to amend the Faddeev-Popov approach. This...
A Lorentz and gauge invariant measure of laser intensity (2008)
Heinzl, Thomas, Ilderton, Anton
Focussing on null fields as simple models of laser beams we discuss the classical relativistic motion of charges in strong electromagnetic fields. We suggest a universal, Lorentz and gauge invariant...
Is the ground state of Yang-Mills theory Coulombic? (2008)
Heinzl, Thomas, Ilderton, Anton, Langfeld, Kurt, Lavelle, Martin, Lutz, Wolfgang, McMullan, David
We study trial states modelling the heavy quark-antiquark ground state in SU(2) Yang-Mills theory. A state describing the flux tube between quarks as a thin string of glue is found to be a poor...
Z_3 Polyakov Loop Models and Inverse Monte-Carlo Methods (2007)
Wozar, Christian, Kaestner, Tobias, Uhlmann, Sebastian, Wipf, Andreas, Heinzl, Thomas
We study effective Polyakov loop models for SU(3) Yang-Mills theory at finite temperature. A comprehensive mean field analysis of the phase diagram is carried out and compared to the results obtained...
Noncommutativity from spectral flow (2007)
Heinzl, Thomas, Ilderton, Anton
We investigate the transition from second to first order systems. This transforms configuration space into phase space and hence introduces noncommutativity in the former. Quantum mechanically, the...
Wozar, Christian, Kaestner, Tobias, Wipf, Andreas, Heinzl, Thomas
This paper concludes our efforts in describing SU(3)-Yang-Mills theories at different couplings/temperatures in terms of effective Polyakov-loop models. The associated effective couplings are...
Generalized Potts-Models and their Relevance for Gauge Theories (2007)
Andreas Wipf, Thomas Heinzl, Tobias Kaestner, Christian Wozar
We study the Polyakov loop dynamics originating from finite-temperature Yang-Mills theory. The effective actions contain center-symmetric terms involving powers of the Polyakov loop, each with its...
Generalized Potts-Models and their Relevance for Gauge Theories (2006)
Wipf, Andreas, Heinzl, Thomas, Kaestner, Tobias, Wozar, Christian
We study the Polyakov loop dynamics originating from finite-temperature Yang-Mills theory. The effective actions contain center-symmetric terms involving powers of the Polyakov loop, each with its...
Phase Structure of Z(3)-Polyakov-Loop Models (2006)
Wozar, Christian, Kaestner, Tobias, Wipf, Andreas, Heinzl, Thomas, Pozsgay, Balazs
We study effective lattice actions describing the Polyakov loop dynamics originating from finite-temperature Yang-Mills theory. Starting with a strong-coupling expansion the effective action is...
Large orders in strong-field QED (2006)
Heinzl, Thomas, Schroeder, Oliver
We address the issue of large-order expansions in strong-field QED. Our approach is based on the one-loop effective action encoded in the associated photon polarisation tensor. We concentrate on the...
Effective Lattice Actions for Finite-Temperature Yang-Mills Theory (2005)
Heinzl, Thomas, Kaestner, Tobias, Wipf, Andreas
We determine effective lattice actions for the Polyakov loop using inverse Monte Carlo techniques.
Effective Actions for the SU(2) Confinement-Deconfinement Phase Transition (2005)
Heinzl, Thomas, Kaestner, Tobias, Wipf, Andreas
We compare different Polyakov loop actions yielding effective descriptions of finite-temperature SU(2) Yang-Mills theory on the lattice. The actions are motivated by a simultaneous strong-coupling...
Light-cone zero modes revisited (2003)
The vacuum problem of light-cone quantum field theory is reanalysed from a functional-integral point of view.
Effective lattice theories for Polyakov loops (2003)
Dittmann, Leander, Heinzl, Thomas, Wipf, Andreas
We derive effective actions for SU(2) Polyakov loops using inverse Monte Carlo techniques. In a first approach, we determine the effective couplings by requiring that the effective ensemble...
The Light-Cone Effective Potential (2002)
It is shown how to calculate simple vacuum diagrams in light-cone quantum field theory. As an application, I consider the one-loop effective potential of phi^4 theory. The standard result is...
Effective sigma models and lattice Ward identities (2002)
Dittmann, Leander, Heinzl, Thomas, Wipf, Andreas
We perform a lattice analysis of the Faddeev-Niemi effective action conjectured to describe the low-energy sector of SU(2) Yang-Mills theory. To this end we generate an ensemble of unit vector fields...
Light-Cone Dynamics of Particles and Fields (1998)
We review the foundations as well as a number of important applications of light-cone dynamics. Topics covered are: relativistic particle dynamics, reparametrization invariance, Dirac's front form,...
Variational Mass Perturbation Theory for Light-Front Bound-State Equations (1997)
Harada, Koji, Heinzl, Thomas, Stern, Christian
We investigate the mesonic light-front bound-state equations of the 't Hooft and Schwinger model in the two-particle, i.e. valence sector, for small fermion mass. We perform a high precision...
Hamiltonian Formulations of Yang-Mills Quantum Theory and the Gribov Problem (1996)
We review the status of quantising (non-abelian) gauge theories using different versions of a Hamiltonian formulation corresponding to Dirac's instant and front form of dynamics, respectively. In...
Light Front Quantisation of Gauge Theories in a Finite Volume (1994)
We discuss the light-front formulation of SU(2) Yang-Mills theory on a torus. The gauge choice we use allows for an exact and unambiguous solution of Gauss's law.