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Universal Renormalons in Principal Chiral Models
Falk Bruckmann, Matthias Puhr
Perturbative expansions in many physical systems yield 'only' asymptotic series which are not even Borel resummable. Interestingly, the corresponding ambiguities point to nonpertur…
O(3) nonlinear sigma model in 1+1 dimensions with matrix product states
Falk Bruckmann, Karl Jansen, Stefan Kühn
We numerically study the spectral properties, the entanglement and the zero-temperature phase structure at nonvanishing chemical potential of the O(3) nonlinear sigma model. Using…
A Lattice Study of Renormalons in Asymptotically Free Sigma Models
Matthias Puhr, Falk Bruckmann
In general, perturbative expansions of observables in powers of the coupling constant in quantum field theories are asymptotic series. In many cases it is possible to apply resumma…
Landau levels in QCD in an external magnetic field
Falk Bruckmann, Gergely Endrodi, Matteo Giordano +4
We will discuss the issue of Landau levels of quarks in lattice QCD in an external magnetic field. We will show that in the two-dimensional case the lowest Landau level can be iden…
Diagrammatic representation of scalar QCD and sign problem at nonzero chemical potential
Falk Bruckmann, Jacob Wellnhofer
We consider QCD at strong coupling with scalar quarks coupled to a chemical potential. Performing the link integrals we present a diagrammatic representation of the path integral w…
Anderson localization in sigma models
Falk Bruckmann, Jacob Wellnhofer
In QCD above the chiral restoration temperature there exists an Anderson transition in the fermion spectrum from localized to delocalized modes. We investigate whether the same hol…