Zobrazeno 1 - 10
of 350
pro vyhledávání: '"Wettig T"'
Publikováno v:
Phys. Rev. D 99, 074515 (2019)
We analyze the mass dependence of the chiral condensate for QCD at nonzero $\theta$-angle and find that in general the discontinuity of the chiral condensate is not on the support of the Dirac spectrum. To understand this behavior we decompose the sp
Externí odkaz:
http://arxiv.org/abs/1809.09773
Autor:
Verbaarschot, J. J. M., Wettig, T.
Publikováno v:
Phys. Rev. D 90, 116004 (2014)
We derive exact analytical expressions for the spectral density of the Dirac operator at fixed \theta-angle in the microscopic domain of one-flavor QCD. These results are obtained by performing the sum over topological sectors using novel identities
Externí odkaz:
http://arxiv.org/abs/1407.8393
QPACE is a novel massively parallel architecture optimized for lattice QCD simulations. A single QPACE node is based on the IBM PowerXCell 8i processor. The nodes are interconnected by a custom 3-dimensional torus network implemented on an FPGA. The
Externí odkaz:
http://arxiv.org/abs/1103.1363
Publikováno v:
JHEP 1103:066,2011
We solve a random two-matrix model with two real asymmetric matrices whose primary purpose is to describe certain aspects of quantum chromodynamics with two colours and dynamical fermions at nonzero quark chemical potential mu. In this symmetry class
Externí odkaz:
http://arxiv.org/abs/1012.4461
Autor:
Baier, H., Boettiger, H., Drochner, M., Eicker, N., Fischer, U., Fodor, Z., Frommer, A., Gomez, C., Goldrian, G., Heybrock, S., Hierl, D., Hüsken, M., Huth, T., Krill, B., Lauritsen, J., Lippert, T., Maurer, T., Mendl, B., Meyer, N., Nobile, A., Ouda, I., Pivanti, M., Pleiter, D., Ries, M., Schäfer, A., Schick, H., Schifano, F., Simma, H., Solbrig, S., Streuer, T., Sulanke, K. -H., Tripiccione, R., Vogt, J. -S., Wettig, T., Winter, F.
Publikováno v:
PoS LAT2009:001,2009
QPACE is a novel parallel computer which has been developed to be primarily used for lattice QCD simulations. The compute power is provided by the IBM PowerXCell 8i processor, an enhanced version of the Cell processor that is used in the Playstation
Externí odkaz:
http://arxiv.org/abs/0911.2174
Publikováno v:
Phys.Rev.D79:074016,2009
We study the effect of topology for a random matrix model of QCD at nonzero imaginary chemical potential or nonzero temperature. Non-universal fluctuations of Dirac eigenvalues lead to normalization factors that contribute to the $\theta$-dependence
Externí odkaz:
http://arxiv.org/abs/0902.2640
Autor:
Baier, H., Boettiger, H., Drochner, M., Eicker, N., Fischer, U., Fodor, Z., Goldrian, G., Heybrock, S., Hierl, D., Huth, T., Krill, B., Lauritsen, J., Lippert, T., Maurer, T., McFadden, J., Meyer, N., Nobile, A., Ouda, I., Pivanti, M., Pleiter, D., Schäfer, A., Schick, H., Schifano, F., Simma, H., Solbrig, S., Streuer, T., Sulanke, K. H., Tripiccione, R., Wettig, T., Winter, F.
Publikováno v:
PoS LATTICE2008:039,2008
We give an overview of the QPACE project, which is pursuing the development of a massively parallel, scalable supercomputer for LQCD. The machine is a three-dimensional torus of identical processing nodes, based on the PowerXCell 8i processor. The no
Externí odkaz:
http://arxiv.org/abs/0810.1559
Publikováno v:
J.Math.Phys.49:063510,2008
We introduce an extension of the character expansion method to the case of supergroups. This method allows us to calculate a superversion of the Leutwyler-Smilga integral which, to the best of our knowledge, has not been calculated before. We also us
Externí odkaz:
http://arxiv.org/abs/0801.1226
Publikováno v:
Phys.Rev.Lett.100:032002,2008
We analyze how individual eigenvalues of the QCD Dirac operator at nonzero quark chemical potential are distributed in the complex plane. Exact and approximate analytical results for both quenched and unquenched distributions are derived from non-Her
Externí odkaz:
http://arxiv.org/abs/0710.2865
Autor:
Belletti, F., Bilardi, G., Drochner, M., Eicker, N., Fodor, Z., Hierl, D., Kaldass, H., Lippert, T., Maurer, T., Meyer, N., Nobile, A., Pleiter, D., Schaefer, A., Schifano, F., Simma, H., Solbrig, S., Streuer, T., Tripiccione, R., Wettig, T.
Publikováno v:
PoSLAT2007:039,2007
We evaluate IBM's Enhanced Cell Broadband Engine (BE) as a possible building block of a new generation of lattice QCD machines. The Enhanced Cell BE will provide full support of double-precision floating-point arithmetics, including IEEE-compliant ro
Externí odkaz:
http://arxiv.org/abs/0710.2442