Renormalisation Flow and Universality for Ultracold Fermionic Atoms (2007)
Diehl, S., Gies, H., Pawlowski, J. M., Wetterich, C.
A functional renormalisation group study for the BEC-BCS crossover for ultracold gases of fermionic atoms is presented. We discuss the fixed point which is at the origin of universality for broad...
Flow Equations for the BCS-BEC Crossover (2007)
Diehl, S., Gies, H., Pawlowski, J. M., Wetterich, C.
The functional renormalisation group is used for the BCS-BEC crossover in gases of ultracold fermionic atoms. In a simple truncation, we see how universality and an effective theory with composite...
Large volume behaviour of Yang-Mills propagators (2007)
Fischer, C S., Alkofer, Reinhard, Maas, Axel, Pawlowski, J M.
We summarise results on finite-volume effects in the propagators of Landau gauge Yang-Mills theory using Dyson-Schwinger equations on a 4-dimensional torus. We demonstrate explicitly how the...
Large volume behaviour of Yang-Mills propagators (2007)
Fischer, C S., Alkofer, Reinhard, Maas, Axel, Pawlowski, J M.
We summarise results on finite-volume effects in the propagators of Landau gauge Yang-Mills theory using Dyson-Schwinger equations on a 4-dimensional torus. We demonstrate explicitly how the...
Non-perturbative thermal flows and resummations (2006)
We construct a functional renormalisation group for thermal fluctuations. Thermal resummations are naturally built in, and the infrared problem of thermal fluctuations is well under control. The...
Convexity of the effective action from functional flows (2006)
Litim, D F, Pawlowski, J M, Vergara, L
We show that convexity of the effective action follows from its functional flow equation. Our analysis is based on a new, spectral representation. The results are relevant for the study of physical...
Signatures of confinement in Landau gauge QCD (2005)
Pawlowski, J M, Von Schmekal, L, Litim, D F, Nedelko, S
We summarise an analysis of the infrared regime of Landau gauge QCD by means of a flow equation approach. The infrared behaviour of gluon and ghost propagators is evaluated. The results provide...
Signatures of confinement in Landau gauge QCD (2005)
Pawlowski, J M, Litim, D F, Nedelko, S, Von Schmekal, L
We summarise an analysis of the infrared regime of Landau gauge QCD by means of a flow equation approach. The infrared behaviour of gluon and ghost propagators is evaluated. The results provide...
Infrared QCD and the renormalisation group (2005)
Litim, D. F., Pawlowski, J. M., Nedelko, S. N.
We study the infrared regime of QCD by means of a Wilsonian renormalisation group. We explain how, in general, the infrared structure of Green functions is deduced in this approach. Our reasoning is...
Infrared QCD and the renormalisation group (2005)
Litim, D. F., Pawlowski, J. M., Nedelko, S. N.
We study the infrared regime of QCD by means of a Wilsonian renormalisation group. We explain how, in general, the infrared structure of Green functions is deduced in this approach. Our reasoning is...
Signatures of confinement in Landau gauge QCD (2004)
Pawlowski, J. M., Litim, D. F., Nedelko, S., Von Smekal, L.
We summarise an analysis of the infrared regime of Landau gauge QCD by means of a flow equation approach. The infrared behaviour of gluon and ghost propagators is evaluated. The results provide...
Infrared QCD and the Renormalisation Group (2004)
Litim, D F, Von Smekal, L, Nedelko, S, Pawlowski, J M
We study the infrared regime of QCD by means of a Wilsonian renormalisation group. We explain how, in general, the infrared structure of Green functions is deduced in this approach. Our reasoning is...
Infrared QCD and the Renormalisation Group (2004)
Litim, D F, Pawlowski, J M, Nedelko, S, Von Smekal, L
We study the infrared regime of QCD by means of a Wilsonian renormalisation group. We explain how, in general, the infrared structure of Green functions is deduced in this approach. Our reasoning is...
Infrared behaviour and fixed points in Landau gauge QCD (2004)
Pawlowski, J M, Litim, D F, Nedelko, S N, Von Smekal, L
We investigate the infrared behaviour of gluon and ghost propagators in Landau gauge QCD by means of an exact renormalisation group equation. We explain how, in general, the infrared momentum...
Infrared behavior and fixed points in Landau-gauge QCD (2004)
Pawlowski, J. M., Litim, D. F., Nedelko, S. N.
We investigate the infrared behavior of gluon and ghost propagators in Landau-gauge QCD by means of an exact renormalization group equation. We explain how, in general, the infrared momentum...
Signatures of confinement in Landau gauge QCD (2004)
Pawlowski, J. M., Litim, D. F., Nedelko, S.
We summarise an analysis of the infrared regime of Landau gauge QCD by means of a flow equation approach. The infrared behaviour of gluon and ghost propagators is evaluated. The results provide...
Infrared behavior and fixed points in Landau-gauge QCD (2004)
Pawlowski, J. M., Litim, D. F., Nedelko, S. N.
We investigate the infrared behavior of gluon and ghost propagators in Landau-gauge QCD by means of an exact renormalization group equation. We explain how, in general, the infrared momentum...
Signatures of confinement in Landau gauge QCD (2004)
Pawlowski, J. M., Litim, D. F., Nedelko, S.
We summarise an analysis of the infrared regime of Landau gauge QCD by means of a flow equation approach. The infrared behaviour of gluon and ghost propagators is evaluated. The results provide...
Wilsonian flows and background fields (2002)
Litim, Daniel F, Pawlowski, J M
We study exact renormalisation group flows for background field dependent regularisations. It is shown that proper-time flows are approximations to exact background field flows for a specific class...
Renormalisation group flows for gauge theories in axial gauges (2002)
Litim, Daniel F, Pawlowski, J M
Gauge theories in axial gauges are studied using Exact Renormalisation Group flows. We introduce a background field in the infrared regulator, but not in the gauge fixing, in contrast to the usual...
Completeness and consistency of renormalisation group flows (2002)
Litim, Daniel F, Pawlowski, J M
We study different renormalisation group flows for scale dependent effective actions, including exact and proper-time renormalisation group flows. These flows have a simple one loop structure. They...
Perturbation theory and renormalisation group equations (2001)
Litim, Daniel F, Pawlowski, J M
We discuss the perturbative expansion of several one-loop improved renormalisation group equations. It is shown that in general the integrated renormalisation group flows fail to reproduce...
Predictive power of renormalisation group flows: a comparison (2001)
Litim, Daniel F, Pawlowski, J M
We study a proper-time renormalisation group, which is based on an operator cut-off regularisation of the one-loop effective action. The predictive power of this approach is constrained because the...
Gauge invariance, background fields and modified Ward identities (2001)
Freire, F L, Litim, Daniel F, Pawlowski, J M
In this talk the gauge symmetry for Wilsonian flows in pure Yang-Mills theories is discussed. The background field formalism is used for the construction of a gauge invariant effective action. The...
Gauge invariance, background fields and modified Ward identities (2001)
Freire, F., Litim, D. F., Pawlowski, J. M.
In this talk the gauge symmetry for Wilsonian flows in pure Yang-Mills theories is discussed. The background field formalism is used for the construction of a gauge invariant effective action. The...
ADHM Construction of Instantons on the Torus (2000)
Ford, C., Pawlowski, J. M., Tok, T., Wipf, A.
We apply the ADHM instanton construction to SU(2) gauge theory on T^n x R^(4-n)for n=1,2,3,4. To do this we regard instantons on T^n x R^(4-n) as periodic (modulo gauge transformations) instantons on...
The Two-exponential Liouville Theory and the Uniqueness of the Three-point Function (2000)
O'Raifeartaigh, L., Pawlowski, J. M., Sreedhar, V. V.
It is shown that in the two-exponential version of Liouville theory the coefficients of the three-point functions of vertex operators can be determined uniquely using the translational invariance of...
Duality in Quantum Liouville Theory (1998)
O'Raifeartaigh, L., Pawlowski, J. M., Sreedhar, V. V.
The quantisation of the two-dimensional Liouville field theory is investigated using the path integral, on the sphere, in the large radius limit. The general form of the $N$-point functions of vertex...
Exact Flow Equations and the (1998)
The effective action of a SU(N)-gauge theory coupled to fermions is evaluated at a large infrared cut-off scale k within the path integral approach. The gauge field measure includes topologically...
The Gauss Law Operator Algebra and Double Commutators in Chiral Gauge Theories (1997)
We calculate within an algebraic Bjorken-Johnson-Low (BJL) method anomalous Schwinger terms of fermionic currents and the Gauss law operator in chiral gauge theories. The current algebra is known to...
Polyakov-Loops and Fermionic Zero Modes in QCD2 on the Torus (1996)
Mitreuter, U. G., Pawlowski, J. M., Wipf, A.
A simple derivation of the free energy and expectation values of Polyakov-loops in $QCD_2$ via path integral methods is given. In the chosen gauge (which can be generalized to 4 dimensions) without...
The Definition of Double Commutators and Consistency in Free Field Theory (1996)
Within the framework of generalized functions a general consistent definition of double commutators is given. This definition respects the Jacobi identity even if the regularization is removed. The...
Exact Flow Equations and the U(1)-Problem (1996)
The effective action of a SU(N)-gauge theory coupled to fermions is evaluated at a large infrared cut-off scale k within the path integral approach. The gauge field measure includes topologically...