Prof. Dr. Agostino Patella

Prof. Patella erforscht die präzise Berechnung von Teilcheneigenschaften und Wechselwirkungen durch Gitterfeld-Simulationen, insbesondere unter Berücksichtigung elektromagnetischer und Isospin-Brechungs-Effekte in der Quantenchromodynamik. Sein aktueller Fokus liegt auf der Entwicklung und Anwendung von C-periodischen Randbedingungen für vollständig dynamische QCD+QED-Simulationen, um hochpräzise Vorhersagen für fundamentale Parameter wie die anomales magnetisches Moment des Myons zu ermöglichen. Die Methoden ermöglichen es, theoretische Vorhersagen des Standardmodells mit experimentellen Messungen zu vergleichen und damit Grenzen neuer Physik zu testen. Die Arbeiten sind relevant für die Grundlagenphysik und Präzisionsmessungen in der Teilchenphysik.

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• DFG-Eigene Stelle: Neue Perspektiven in stark gekoppelten Systemen: Vorbereitung auf Quantensimulatoren

  Quelle ↗

  Förderer: DFG Eigene Stelle (Sachbeihilfe) Zeitraum: 08/2018 - 11/2020 Projektleitung: Dr. Debasish Banerjee, Prof. Dr. Agostino Patella

• GRK 2575/1: Überdenken der Quantenfeldtheorie

  Quelle ↗

  Förderer: DFG Graduiertenkolleg Zeitraum: 04/2020 - 09/2024 Projektleitung: Prof. Dr. Jan Plefka

• GRK 2575/2: Überdenken der Quantenfeldtheorie

  Quelle ↗

  Förderer: DFG Graduiertenkolleg Zeitraum: 10/2024 - 03/2029 Projektleitung: Prof. Dr. Jan Plefka

• Higher representations on the lattice: Numerical simulations, SU(2) with adjoint fermions

  2010

  Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · DOI

  We discuss the lattice formulation of gauge theories with fermions in arbitrary representations of the color group and present in detail the implementation of the hybrid Monte Carlo (HMC)/rational HMC algorithm for simulating dynamical fermions. We discuss the validation of the implementation through an extensive set of tests and the stability of simulations by monitoring the distribution of the lowest eigenvalue of the Wilson-Dirac operator. Working with two flavors of Wilson fermions in the adjoint representation, benchmark results for realistic lattice simulations are presented. Runs are performed on different lattice sizes ranging from ${4}^{3}\ifmmode\times\else\texttimes\fi{}8$ to ${24}^{3}\ifmmode\times\else\texttimes\fi{}64$ sites. For the two smallest lattices we also report the measured values of benchmark mesonic observables. These results can be used as a baseline for rapid cross-checks of simulations in higher representations. The results presented here are the first steps toward more extensive investigations with controlled systematic errors, aiming at a detailed understanding of the phase structure of these theories, and of their viability as candidates for strong dynamics beyond the standard model.

• Conformal versus confining scenario in SU(2) with adjoint fermions

  2009

  Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology · DOI

  The masses of the lowest-lying states in the meson and in the gluonic sector of an SU(2) gauge theory with two Dirac flavors in the adjoint representation are measured on the lattice at a fixed value of the lattice coupling $\ensuremath{\beta}=4/{g}_{0}^{2}=2.25$ for values of the bare fermion mass ${m}_{0}$ that span a range between the quenched regime and the massless limit, and for various lattice volumes. Even for light constituent fermions the lightest glueballs are found to be lighter than the lightest mesons. Moreover, the string tension between two static fundamental sources strongly depends on the mass of the dynamical fermions and becomes of the order of the inverse squared lattice linear size before the chiral limit is reached. The implications of these findings for the phase of the theory in the massless limit are discussed and a strategy for discriminating between the (near-)conformal and the confining scenario is outlined.