186,357 research outputs found
The [beta]-function and potential at [beta]=6.0 and 6.3 in Su(3) gauge theory
No full textBowler KC, Gutbrod F, Hasenfratz P, et al. The [beta]-function and potential at [beta]=6.0 and 6.3 in Su(3) gauge theory. Physics Letters, B. 1985;163(5-6):367-370.Comparing optimized Wilson loop ratios on 16 4 and 8 4 lattices, matching predictions are obtained at [beta]=6.0 and 6.3. The static quark potential and string tension are also studied at these coupling constant values
Improved Monte Carlo renormalization group methods
No full textHasenfratz A, Hasenfratz P, Heller U, Karsch F. Improved Monte Carlo renormalization group methods. Physics Letters, B. 1984;140(1-2):76-82.The practical application of MCRG requires the flow lines to reach the renormalized trajectory after a small number of blocking steps. It is suggested to use optimized block transformations in order to shift the fixed point and the renormalized trajectory closer to a given action. In asymptotically free theories, perturbation theory can be used to find the improved block transformations. Another MCRG method, the improved ratio method, is discussed also. The methods are tested on d=2, asymptotically free spin models
Rotational symmetry of the SU(3) potential
No full textHasenfratz A, Hasenfratz P, Heller UM, Karsch F. Rotational symmetry of the SU(3) potential. Zeitschrift für Physik, C: Particles and Fields. 1984;25(2):191-194
Monte Carlo renormalisation group studies of SU(3) lattice gauge theory: CERN-DESY-Edinburgh Collaboration
No full textBowler KC, Hasenfratz A, Hasenfratz P, et al. Monte Carlo renormalisation group studies of SU(3) lattice gauge theory: CERN-DESY-Edinburgh Collaboration. Nuclear Physics, B. 1985;257(2):155-172.Results are reported of Monte Carlo renormalisation group studies of the approach to asymptotic scaling in SU(3) lattice gauge theory. By comparing measurements on 8 4 and 16 4 lattices, estimates are obtained for the shift, [Delta][beta], in the fundamental plaquette coupling, [beta9, corresponding to a change of length scale by a factor of 2. The definitions of block link variables contain a free parameter whose value can be optimised to minimise the transient flow to a renormalised trajectory. Our results, at [beta] = 6.0, 6.3 and 6.6, are consistent with those obtained previously with the improved ratio method, which is also briefly discussed. In both methods simulation is performed only with the standard Wilson action. An important feature of the results is the appearance of a pronounced dip in [Delta][beta] which implies that in the presently accesible range of [beta] the asymptotic value is approached from below, and its onset is delayed
The [beta]-function of the SU(3) Wilson action
No full textHasenfratz A, Hasenfratz P, Heller U, Karsch F. The [beta]-function of the SU(3) Wilson action. Physics Letters, B. 1984;143(1-3):193-198.The quantitative behaviour of the [beta]-function of the standard SU(3) Wilson action is studied with the help of a systematically optimized Monte Carlo Renormalization Group method
H.-P. Hasenfratz, Religie świata starożytnego a chrześcijaństwo
No full textRecenzjaHANS-PETER HASENFRATZ, RELIGIE ŚWIATA STAROŻYTNEGO A CHRZEŚCIJAŃSTWO, TŁUM. URSZULA POPRAWSKA, KRAKÓW 2006, WAM, SS. 17
The SU(3) [beta]-function at large [beta]
No full textBowler KC, Hasenfratz A, Hasenfratz P, et al. The SU(3) [beta]-function at large [beta]. Physics Letters, B. 1986;179(4):375-378
Chemical potential on the lattice
No full textHasenfratz P, Karsch F. Chemical potential on the lattice. Physics Letters, B. 1983;125(4):308-310.The naïve way of introducing chemical potential on the lattice leads to quadratic divergences even for free fermions. Starting from the analogy between the chemical potential and the fourth component of an abelian gauge field, a simple solution is proposed. For Wilson fermions it leads to a trivial modification of the hopping parameter of quarks propagating along the imaginary time direction
Finite fermion density on the lattice
No full textHasenfratz P, Karsch F. Finite fermion density on the lattice. Physics Reports. 1984;103(1-4):219-223.The naïve way of introducing finite fermion density on the lattice leads to quadratic divergences even for free fermions. The problem is discussed and a simple solution is suggested in this paper
Hans-Peter Hasenfratz, Der Tod in der Welt der Religionen, Darmstadt, Wissenschaftliche Buchgesellschaft, 2009
No full textThierry Legrand. Hans-Peter Hasenfratz, Der Tod in der Welt der Religionen, Darmstadt, Wissenschaftliche Buchgesellschaft, 2009. In: Revue d'histoire et de philosophie religieuses, 91e année n°4, Octobre-Décembre 2011. p. 604
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