Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Bruckmann Falk"'
Autor:
Bruckmann Falk, Wellnhofer Jacob
Publikováno v:
EPJ Web of Conferences, Vol 175, p 07005 (2018)
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 holds for nonlinear sigma models which share properties like dynamical ma
Externí odkaz:
https://doaj.org/article/be7f7353a25540d69dd8601b482b6098
Autor:
Bruckmann Falk, Endrődi Gergely, Giordano Matteo, Katz Sándor D., Kovács Tamás G., Pittler Ferenc, Wellnhofer Jacob
Publikováno v:
EPJ Web of Conferences, Vol 175, p 07014 (2018)
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 identified unambiguously even if the strong interactions are turned on. St
Externí odkaz:
https://doaj.org/article/18217f0b0bbc475fb3f6abdae4439e21
Autor:
Bruckmann Falk, Endrődi Gergely, Giordano Matteo, Katz Sándor D., Kovács Tamás G., Pittler Ferenc, Wellnhofer Jacob
Publikováno v:
EPJ Web of Conferences, Vol 137, p 03003 (2017)
The thermodynamics of Quantum Chromodynamics (QCD) in external (electro-)magnetic fields shows some unexpected features like inverse magnetic catalysis, which have been revealed mainly through lattice studies. Many effective descriptions, on the othe
Externí odkaz:
https://doaj.org/article/30f23dda7974472fa5dba9c6cf1cb41a
Autor:
Bruckmann, Falk, Puhr, Matthias
Publikováno v:
Phys. Rev. D 101, 034513 (2020)
Perturbative expansions in many physical systems yield 'only' asymptotic series which are not even Borel resummable. Interestingly, the corresponding ambiguities point to nonperturbative physics. We numerically verify this renormalon mechanism for th
Externí odkaz:
http://arxiv.org/abs/1906.09471
Publikováno v:
Phys. Rev. D 99, 074501 (2019)
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 matrix product states, a particular kind of one-dimensional tensor net
Externí odkaz:
http://arxiv.org/abs/1812.00944
Autor:
Puhr, Matthias, Bruckmann, Falk
Publikováno v:
PoS(LATTICE2018)237
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 resummation techniques to assign a unique finite value to an asymptotic serie
Externí odkaz:
http://arxiv.org/abs/1811.02836
Autor:
Bruckmann, Falk, Urbina, Juan Diego
Two long-standing problems in the construction of coherent state path integrals, the unwarranted assumption of path continuity and the ambiguous definition of the Hamiltonian symbol, are rigorously solved. To this end the fully controlled dual repres
Externí odkaz:
http://arxiv.org/abs/1807.10462
Autor:
Bruckmann, Falk, Lochner, Stephan
Publikováno v:
Phys. Rev. D 98, 065005 (2018)
We analyze two-dimensional nonlinear sigma models at nonzero chemical potentials, which are governed by a complex action. In the spirit of contour deformations (thimbles) we extend the fields into the complex plane, which allows to incorporate the ch
Externí odkaz:
http://arxiv.org/abs/1805.11313
Autor:
Bruckmann, Falk, Endrodi, Gergely, Giordano, Matteo, Katz, Sandor D., Kovacs, Tamas G., Pittler, Ferenc, Wellnhofer, Jacob
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 identified unambiguously even if the strong interactions are turned on. St
Externí odkaz:
http://arxiv.org/abs/1711.08720
Autor:
Bruckmann, Falk, Wellnhofer, Jacob
Publikováno v:
Phys. Rev. D 97, 014501 (2018)
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 weight. It is based on mesonic and baryonic building blocks, in close a
Externí odkaz:
http://arxiv.org/abs/1710.08243