121 citations · 1.3k across the 46 of their papers we have counts for
8 papers · 1 filter
Finite density non-linear sigma model and low energy physics
Falk Bruckmann, Christof Gattringer, Thomas Kloiber +1
We present lattice results for simulations of the non-linear sigma model at finite chemical potential. The complex action problem is overcome by a dual variable representati…
Toward Picard-Lefschetz Theory of Path Integrals, Complex Saddles and Resurgence
Alireza Behtash, Gerald V. Dunne, Thomas Schaefer +2
We show that the semi-classical analysis of generic Euclidean path integrals necessarily requires complexification of the action and measure, and consideration of complex saddle so…
Complexified path integrals, exact saddles and supersymmetry
Alireza Behtash, Gerald V. Dunne, Thomas Schaefer +2
In the context of two illustrative examples from supersymmetric quantum mechanics we show that the semi-classical analysis of the path integral requires complexification of the con…
Grand canonical ensemble, multi-particle wave functions, scattering data, and lattice field theories
Falk Bruckmann, Christof Gattringer, Thomas Kloiber +1
We show that information about scattering data of a quantum field theory can be obtained from studying the system at finite density and low temperatures. In particular we consider…
Dual lattice representations for O(N) and CP(N-1) models with a chemical potential
Falk Bruckmann, Christof Gattringer, Thomas Kloiber +1
We derive dual representations for O(N) and CP(N-1) models on the lattice. In terms of the dual variables the partition sums have only real and positive contributions also at finit…
The curious incident of multi-instantons and the necessity of Lefschetz thimbles
Alireza Behtash, Erich Poppitz, Tin Sulejmanpasic +1
We show that compatibility of supersymmetry with exact semi-classics demands that in calculating multi-instanton amplitudes, the "separation" quasi-zeromode must be complexified an…
Hidden topological angles and Lefschetz thimbles
Alireza Behtash, Tin Sulejmanpasic, Thomas Schaefer +1
We demonstrate the existence of hidden topological angles (HTAs) in a large class of quantum field theories and quantum mechanical systems. HTAs are distinct from theta-parameters…
Strings from domain walls in supersymmetric Yang-Mills theory and adjoint QCD
Mohamed M. Anber, Erich Poppitz, Tin Sulejmanpasic
We study strings between static quarks in QCD with adjoint fermions, including Super Yang-Mills (SYM), in the calculable regime on . We f…