Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy Ion Collision and QCD Phases VIII

HK 34.2: Talk

Wednesday, March 16, 2016, 14:30–14:45, S1/01 A01

Stochastic Quantization with Colored Noise — •Felix Ziegler, Jan Martin Pawlowski, and Ion-Olimpiu Stamatescu — Institute for Theoretical Physics, Heidelberg University

Studying the topological properties of the QCD vacuum, observables obtained from lattice simulations are suffering from short-distance fluctuations. To solve this problem, smoothening methods such as cooling and the Wilson flow have been developed.

We present a method based on stochastic quantization with UV-regulated noise enabling a direct control of the quantum fluctuations at all lattice momentum scales. Smoothened configurations are generated from the beginning.

The method is tested on a scalar field theory in two and four dimensions as well as pure SU(2) gauge theory. Effects of colored noise on observables are analyzed. Moreover, we investigate the existence of a scale above which physical quantities become independent of UV fluctuations at larger scales.

We present and discuss our recent results.