42 citations · 221 across the 18 of their papers we have counts for
19 papers
Functional Renormalization Group flows as diffusive Hamilton-Jacobi-type equations
Adrian Koenigstein, Martin J. Steil, Stefan Floerchinger
In order to find reliable and efficient numerical approximation schemes, we suggest to identify the Functional Renormalization Group flow equations of one-particle irreducible two-…
Functional Renormalization Group meets Computational Fluid Dynamics: RG flows in a multi-dimensional field space
Niklas Zorbach, Adrian Koenigstein, Jens Braun
Within the Functional Renormalisation Group (FRG) approach, we present a fluid-dynamical approach to solving flow equations for models living in a multi-dimensional field space. To…
Functional renormalization of QCD in dimensions: four-fermion interactions from quark-gluon dynamics
Eric Oevermann, Adrian Koenigstein, Stefan Floerchinger
Quantum Chromodynamics in two spacetime dimensions is investigated with the Functional Renormalization Group. We use a functional formulation with covariant gauge fixing and derive…
Solving the Lindblad equation with methods from computational fluid dynamics
Jan Rais, Adrian Koenigstein, Niklas Zorbach +1
Liouvillian dynamics describes the evolution of a density operator in closed quantum systems. One extension towards open quantum systems is provided by the Lindblad equation. It is…
Revisiting the spatially inhomogeneous condensates in the -dimensional chiral Gross-Neveu model via the bosonic two-point function in the infinite- limit
Adrian Koenigstein, Marc Winstel
This work shows that the known phase boundary between the phase with chiral symmetry and the phase of spatially inhomogeneous chiral symmetry breaking in the phase diagram of the $…
Inhomogeneous condensation in the Gross-Neveu model in noninteger spatial dimensions . II. Nonzero temperature and chemical potential
Adrian Koenigstein, Laurin Pannullo
We continue previous investigations of the (inhomogeneous) phase structure of the Gross-Neveu model in a noninteger number of spatial dimensions () in the limit of an…
Reanalysis of critical exponents for the O(N) model via a hydrodynamic approach to the Functional Renormalization Group
Fabrizio Murgana, Adrian Koenigstein, Dirk H. Rischke
We compute the critical exponents of the O(N) model within the Functional Renormalization Group (FRG) approach. We use recent advances which are based on the observation that the F…
Detecting inhomogeneous chiral condensation from the bosonic two-point function in the -dimensional Gross-Neveu model in the mean-field approximation
Adrian Koenigstein, Laurin Pannullo, Stefan Rechenberger +2
The phase diagram of the -dimensional Gross-Neveu model is reanalyzed for (non-)zero chemical potential and (non-)zero temperature within the mean-field approximation. By…
Bosonic fluctuations in the -dimensional Gross-Neveu(-Yukawa) model at varying and and finite
Jonas Stoll, Niklas Zorbach, Adrian Koenigstein +2
Using analogies between flow equations from the Functional Renormalization Group and flow equations from (numerical) fluid dynamics we investigate the effects of bosonic fluctuatio…
Numerical fluid dynamics for FRG flow equations: Zero-dimensional QFTs as numerical test cases. II. Entropy production and irreversibility of RG flows
Adrian Koenigstein, Martin J. Steil, Nicolas Wink +2
We demonstrate that the reformulation of renormalization group (RG) flow equations as non-linear heat equations has severe implications on the understanding of RG flows in general.…
Numerical fluid dynamics for FRG flow equations: Zero-dimensional QFTs as numerical test cases. III. Shock and rarefaction waves in RG flows reveal limitations of the limit in -type models
Martin J. Steil, Adrian Koenigstein
Using an -symmetric toy model QFT in zero space-time dimensions we discuss several aspects and limitations of the -expansion. We demonstrate, how slight modifica…
Numerical fluid dynamics for FRG flow equations: Zero-dimensional QFTs as numerical test cases. I. The model
Adrian Koenigstein, Martin J. Steil, Nicolas Wink +4
The functional renormalization group (FRG) approach is a powerful tool for studies of a large variety of systems, ranging from statistical physics over the theory of the strong int…
Phenomenology of tensor mesons
Shahriyar Jafarzade, Adrian Koenigstein, Francesco Giacosa
We study the strong and radiative decays of the anti-quark-quark ground state () nonet {, , $ϕ_{3} (…
How the axial anomaly controls flavor mixing among mesons
Francesco Giacosa, Adrian Koenigstein, Robert D. Pisarski
It is well known that because of the axial anomaly in QCD, mesons with are close to eigenstates: the meson is largely a singlet,…
Fermions in worldline holography
Dennis D. Dietrich, Adrian Koenigstein
We analyse the worldline holographic framework for fermions. Worldline holography is based on the observation that in the worldline approach to quantum field theory, sources of a q…
Schwinger's proper time and worldline holographic renormalisation
Dennis D. Dietrich, Adrian Koenigstein
Worldline holography states that within the framework of the worldline approach to quantum field theory, sources of a quantum field theory over Mink naturally form a field theo…
Phenomenology of pseudotensor mesons and the pseudotensor glueball
Adrian Koenigstein, Francesco Giacosa
We study the decays of the pseudotensor mesons interpreted as the ground-state nonet of states us…
Gauge Theory by canonical Transformations
Adrian Koenigstein, Johannes Kirsch, Horst Stoecker +3
Electromagnetism, the strong and the weak interaction are commonly formulated as gauge theories in a Lagrangian description. In this paper we present an alternative formal derivati…
Classical and quantum theory of the massive spin-two field
Adrian Koenigstein, Francesco Giacosa, Dirk H. Rischke
In this paper, we review classical and quantum field theory of massive non-interacting spin-two fields. We derive the equations of motion and Fierz-Pauli constraints via three diff…