Josephson oscillation of a superfluid Fermi gas

Using the complete numerical solution of a time-dependent three-dimensional mean-field model we study the Josephson oscillation of a superfluid Fermi gas (SFG) at zero temperature formed in a combined axially-symmetric harmonic plus one-dimensional periodic optical-lattice (OL) potentials after displacing the harmonic trap along the axial OL axis. We study the dependence of Josephson frequency on the strength of the OL potential. The Josephson frequency decreases with increasing strength as found in the experiment of Cataliotti et al. [Science 293 (2001) 843] for a Bose-Einstein condensate and of the experiment of Pezze et al. [Phys. Rev. Lett. 93 (2004) 120401] for an ideal Fermi gas. We demonstrate a breakdown of Josephson oscillation in the SFG for a large displacement of the harmonic trap. These features of Josephson oscillation of a SFG can be tested experimentally.Comment: 7 pages, 10 figure

Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at 2.76 TeV

We report on the first measurement of the triangular $v_3$, quadrangular $v_4$, and pentagonal $v_5$ charged particle flow in Pb-Pb collisions at 2.76 TeV measured with the ALICE detector at the CERN Large Hadron Collider. We show that the triangular flow can be described in terms of the initial spatial anisotropy and its fluctuations, which provides strong constraints on its origin. In the most central events, where the elliptic flow $v_2$ and $v_3$ have similar magnitude, a double peaked structure in the two-particle azimuthal correlations is observed, which is often interpreted as a Mach cone response to fast partons. We show that this structure can be naturally explained from the measured anisotropic flow Fourier coefficients.Comment: 10 pages, 4 figures, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/387

Zur numerischen Realisierung von Kontinuitaetsmethoden mit Praediktor-Korrektor- oder simplizialen Verfahren

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MG01: A multi-grid program to solve U-c(x,y)U=f(x,y) (on ); U=g(x,y) on (d ) on nonrectangular bounded domains

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Piecewise Pade-approximation of e-x on [O,infinite]

Also published in: Journal of approximation theorySIGLEDEGerman

Direct and converse theorems for approximation of curves by polygons

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Multigrid software for the solution of elliptic problems on rectangular domains: MG00 (release 1)

Proceedings of the conference on multigrid methods held at Koeln-Porz, 23 - 27 Nov 1981SIGLEDEGerman

Multigrid methods: fundamental algorithms, model problem analysis and applications

Proceedings of the conference on mulitgrid methods held at Koeln-Porz, 23 - 27 Nov 1981 published in: Lecture notes in mathematics, v. 960 by Springer, Berlin (Germany, F.R.)SIGLEDEGerman