Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Wellegehausen, Bjoern H."'
Publikováno v:
Phys. Rev. D 96, 094504 (2017)
The Thirring model is a four-fermion theory with a current-current interaction and $U(2N)$ chiral symmetry. It is closely related to three-dimensional QED and other models used to describe properties of graphene. In addition it serves as a toy model
Externí odkaz:
http://arxiv.org/abs/1708.01160
Publikováno v:
PoS(LATTICE2016)078
We study generic properties of strongly interacting matter at finite density as relevant to heavy-ion collisions at moderate beam energies or the physics of neutron stars and their mergers. Because of the fermion-sign problem in lattice QCD, here we
Externí odkaz:
http://arxiv.org/abs/1702.00238
$G_2$-QCD, in which the exceptional Lie group $G_2$ replaces the $SU(3)$ gauge group of QCD, does not suffer from a fermion sign problem. It can therefore be simulated also at comparatively low temperatures and high densities on the lattice, which he
Externí odkaz:
http://arxiv.org/abs/1501.06706
We study the non-perturbative renormalization group flow of the nonlinear O(N) sigma model in two and three spacetime dimensions using a scheme that combines an effective local Hybrid Monte Carlo update routine, blockspin transformations and a Monte
Externí odkaz:
http://arxiv.org/abs/1402.1851
Publikováno v:
Phys. Rev. D 89, 056007 (2014)
The QCD phase diagram at densities relevant to neutron stars remains elusive, mainly due to the fermion-sign problem. At the same time, a plethora of possible phases has been predicted in models. Meanwhile $G_2$-QCD, for which the $SU(3)$ gauge group
Externí odkaz:
http://arxiv.org/abs/1312.5579
A study of the renormalization group flow in the three-dimensional nonlinear O(N) sigma model using Monte Carlo Renormalization Group (MCRG) techniques is presented. To achieve this, we combine an improved blockspin transformation with the canonical
Externí odkaz:
http://arxiv.org/abs/1310.8202
Due to the fermion sign problem, standard lattice Monte-Carlo method for QCD fail at small temperatures and high baryon densities. $G_2$-QCD, QCD with the gauge group $SU(3)$ replaced by the exceptional Lie group $G_2$, can be simulated using lattice
Externí odkaz:
http://arxiv.org/abs/1310.7745
Supersymmetry is a prominent candidate for physics beyond the standard model. In order to compute the spectrum of supersymmetric theories, we employ nonperturbative lattice QFT techniques which due to the discretisation of spacetime violate supersymm
Externí odkaz:
http://arxiv.org/abs/1310.6210
Autor:
Maas, Axel, Wellegehausen, Björn H.
Publikováno v:
PoS(Lattice 2012)080
QCD can be formulated using any gauge group. One particular interesting choice is to replace SU(3) by the exceptional group G2. Conceptually, this group is the simplest group with a trivial center. It thus permits to study the conjectured relevance o
Externí odkaz:
http://arxiv.org/abs/1210.7950
Autor:
Wellegehausen, Björn H.
We investigate gauge theories based on the smallest exceptional simple lie group G(2). Our first model considered here is G(2) Yang-Mills coupled to a fundamental Higgs field. In 4 spacetime dimensions we explore the phase diagram of the theory, show
Externí odkaz:
http://arxiv.org/abs/1111.0496