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The transition temperature (T c) of QCD is determined by Symanzik improved gauge and stout-link improved staggered fermionic lattice simulations. We use physical masses both for the light quarks (m ud) and for the strange quark (m s). Four sets of lattice spacings (N t =4,6,8 and 10) were used to carry out a continuum extrapolation. It turned out that only… (More)

The speed, bandwidth and cost characteristics of today's PC graphics cards make them an attractive target as general purpose computational platforms. High performance can be achieved also for lattice simulations but the actual implementation can be cumbersome. This paper outlines the architecture and programming model of modern graphics cards for the… (More)

A critical point (E) is expected in QCD on the temperature (T) versus baryonic chemical potential (µ) plane. Using a recently proposed lattice method for µ =0 we study dynamical QCD with n f =2+1 staggered quarks of physical masses on L t = 4 lattices. Our result for the critical point is T E = 162 ± 2 MeV and µ E = 360 ± 40 MeV. For the critical… (More)

A PC-based parallel computer for medium/large scale lattice QCD simulations is suggested. The Eötvös Univ., Inst. Theor. Phys. cluster consists of 137 Intel P4-1.7GHz nodes. Gigabit Ethernet cards are used for nearest neighbor communication in a two-dimensional mesh. The sustained performance for dynamical staggered(wilson) quarks on large lattices is… (More)

- Z Fodor, S D Katz, A Ringwald, H Tu
- 2003

We propose a scenario in which a simple power-like primary spectrum for protons with sources at cosmological distances leads to a quantitative description of all the details of the observed cosmic ray spectrum for energies from 10 17 eV to 10 21 eV. As usual, the ultrahigh energy protons with energies above E GZK ≈ 4 · 10 19 eV loose a large fraction of… (More)

Transformation of epithelial cells into connective tissue cells (epithelial-mesenchymal transition, EMT) is a complex mechanism involved in tumor metastasis, and in normal embryogenesis, while type II EMT is mainly associated with inflammatory events and tissue regenaration. In this study we examined type II EMT at the ultrastructural and molecular level… (More)

We present first, exploratory results of a hybrid Monte-Carlo algorithm for dynamical, n f =2, four-dimensional QCD with overlap fermions. As expected, the computational requirements are typically two orders of magnitude larger for the dynamical overlap formalism than for the more conventional (Wilson or staggered) formulations.

Quantum chromodynamics (QCD) is the theory of the strong interaction, explaining (for example) the binding of three almost massless quarks into a much heavier proton or neutron--and thus most of the mass of the visible Universe. The standard model of particle physics predicts a QCD-related transition that is relevant for the evolution of the early Universe.… (More)

- S Dürr, Z Fodor, J Frison, C Hoelbling, R Hoffmann, S D Katz +6 others
- Science
- 2008

More than 99% of the mass of the visible universe is made up of protons and neutrons. Both particles are much heavier than their quark and gluon constituents, and the Standard Model of particle physics should explain this difference. We present a full ab initio calculation of the masses of protons, neutrons, and other light hadrons, using lattice quantum… (More)

Based on universal arguments it is believed that there is a critical point (E) in QCD on the temperature (T) versus chemical potential (µ) plane, which is of extreme importance for heavy-ion experiments. Using finite size scaling and a recently proposed lattice method to study QCD at finite µ we determine the location of E in QCD with n f =2+1 dynamical… (More)