Humboldt-Universität zu Berlin

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2009Show all

189 papers · 1 filter

physics.atom-ph2009★ 1 cited

Final-State Spectrum of $^{3}$ He after $β^{-}$ Decay of Tritium Anions T $^{-}$

Alexander Stark, Alejandro Saenz

The final-state spectrum of $β$ decaying tritium anions T $^{-}$ was calculated. The wavefunctions describing the initial T $^{-}$ ground state and the final $^{3}$ He states were obtained…

hep-th2009★ 35 cited

Correlators of supersymmetric Wilson loops at weak and strong coupling

Antonio Bassetto, Luca Griguolo, Fabrizio Pucci +3

We continue our study of the correlators of a recently discovered family of BPS Wilson loops in N=4 supersymmetric U(N) Yang-Mills theory. We perform explicit computations at weak…

astro-ph.CO2009★ 47 cited

PKS 2005-489 at VHE: Four Years of Monitoring with HESS and Simultaneous Multi-wavelength Observations

The HESS Collaboration, F. Acero

VHE observations of PKS 2005-489 were made with HESS from 2004 through 2007, together with three simultaneous multi-wavelength campaigns performed with XMM-Newton and RXTE in 2004…

hep-lat2009★ 97 cited

SU(2) lattice gluon propagator: continuum limit, finite-volume effects and infrared mass scale m_IR

V. G. Bornyakov, V. K. Mitrjushkin, M. Müller-Preussker

We study the scaling behavior and finite (physical) volume effects as well as the Gribov copy dependence of the SU(2) Landau gauge gluon propagator on the lattice. Our physical lat…

hep-ph2009★ 33 cited

Properties of the massive Gross-Neveu model with nonzero baryon and isospin chemical potentials

D. Ebert, K. G. Klimenko

The properties of the two-flavored Gross-Neveu model with nonzero current quark mass are investigated in the (1+1)-dimensional spacetime at finite isospin $μ_{I}$ as well as quark nu…

hep-th2009★ 18 cited

The Vortex Structure of SU(2) Calorons

Falk Bruckmann, Ernst-Michael Ilgenfritz, Boris Martemyanov +1

We reveal the center vortex content of SU(2) calorons and ensembles of them. We use Laplacian Center Gauge as well as Maximal Center Gauges to show that the vortex in a single calo…

hep-lat2009★ 11 cited

Two-point functions of quenched lattice QCD in Numerical Stochastic Perturbation Theory. (I) The ghost propagator in Landau gauge

F. Di Renzo, E. -M. Ilgenfritz, H. Perlt +2

This is the first of a series of two papers on the perturbative computation of the ghost and gluon propagators in SU(3) Lattice Gauge Theory. Our final aim is to eventually compare…

q-bio.NC2009★ 50 cited

Bursts generate a non-reducible spike pattern code

Hugo Gabriel Eyherabide, Ariel Rokem, Andreas V. M. Herz +1

At the single-neuron level, precisely timed spikes can either constitute firing-rate codes or spike-pattern codes that utilize the relative timing between consecutive spikes. There…

hep-th2009★ 203 cited

A supermatrix model for N=6 super Chern-Simons-matter theory

Nadav Drukker, Diego Trancanelli

We construct the Wilson loop operator of N=6 super Chern-Simons-matter which is invariant under half of the supercharges of the theory and is dual to the simplest macroscopic open…

hep-ex2009★ 81 cited

A Search for B+ -> tau+ nu Recoiling Against B- -> D0 l- nu X

The BABAR Collaboration, B. Aubert

We present a search for the decay $B^{+} \to ℓ^{+} ν_{ℓ}$ ( $ℓ = e, μτ$ ) in $(458.9 \pm 5.1) \times 1 0^{6}$ $B B ˉ$ pairs recorded with the BABAR detector at the PEP-II B-Facto…

hep-lat2009★ 3 cited

The Landau gauge gluon propagator in 4D SU(2) lattice gauge theory revisited: Gribov copies and scaling properties

I. L. Bogolubsky, E. -M. Ilgenfritz, M. Müller-Preussker +1

Lattice results for the gluon propagator in SU(2) pure gauge theory obtained on large lattices are presented. Simulated annealing is used throughout to fix the Landau gauge. We con…

math.DG2009★ 1 cited

On Branson's $Q$ -curvature of order eight

Andreas Juhl

We prove a universal recursive formulas for Branson's $Q$ -curvature of order eight in terms of lower-order $Q$ -curvatures, lower-order GJMS-operators and holographic coefficients.…

hep-lat2009★ 4 cited

On the phase structure of lattice QCD with twisted-mass Wilson fermions at non-zero temperature

M. Muller-Preussker, E. -M. Ilgenfritz, K. Jansen +7

In this talk we give an overview of the 3D phase diagram of two-flavour non-zero temperature lattice QCD with twisted-mass Wilson fermions and a tree-level Symanzik-improved gauge…

hep-ph2009★ 356 cited

Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data

S. Actis, A. Arbuzov, G. Balossini +53

We present the achievements of the last years of the experimental and theoretical groups working on hadronic cross section measurements at the low energy e+e- colliders in Beijing,…

cond-mat.stat-mech2009★ 9 cited

Comment on "Time-averaged properties of unstable periodic orbits and chaotic orbits in ordinary differential equation systems"

Michael A. Zaks, Denis S. Goldobin

The recent paper claims that mean characteristics of chaotic orbits differ from the corresponding values averaged over the set of unstable periodic orbits, embedded in the chaotic…

hep-th2009★ 25 cited

Space-like minimal surfaces in AdS x S

Harald Dorn, Nadav Drukker, George Jorjadze +1

We present a four parameter family of classical string solutions in AdS_3 x S^3, which end along a light-like tetragon at the boundary of AdS_3 and carry angular momentum along two…

math.AG2009★ 16 cited

Fulton's Conjecture for \bar{M}_{0,7}

Paul Larsen

Fulton's conjecture for the moduli space of stable pointed rational curves, \bar{M}_{0,n}, claims that a divisor non-negatively intersecting all F-curves is linearly equivalent to…

physics.ins-det2009★ 95 cited

Readiness of the ATLAS Liquid Argon Calorimeter for LHC Collisions

The ATLAS Collaboration

The ATLAS liquid argon calorimeter has been operating continuously since August 2006. At this time, only part of the calorimeter was readout, but since the beginning of 2008, all c…

hep-lat2009★ 2 cited

Topological Structure of the QCD Vacuum Revealed by Overlap Fermions

E. -M. Ilgenfritz, K. Koller, Y. Koma +2

Overlap fermions preserve a remnant of chiral symmetry on the lattice. They are a powerful tool to investigate the topological structure of the vacuum of Yang-Mills theory and full…

cs.DM2009★ 2 cited

Max-Leaves Spanning Tree is APX-hard for Cubic Graphs

Paul Bonsma

We consider the problem of finding a spanning tree with maximum number of leaves (MaxLeaf). A 2-approximation algorithm is known for this problem, and a 3/2-approximation algorithm…

hep-lat2009★ 18 cited

Three dimensional finite temperature SU(3) gauge theory in the confined region and the string picture

P. Bialas, L. Daniel, A. Morel +1

We determine the correlation between Polyakov loops in three dimensional SU(3) gauge theory in the confined region at finite temperature. For this purpose we perform lattice calcul…

cs.DS2009★ 3 cited

Approximation Schemes for Steiner Forest on Planar Graphs and Graphs of Bounded Treewidth

MohammadHossein Bateni, MohammadTaghi Hajiaghayi, Dániel Marx

We give the first polynomial-time approximation scheme (PTAS) for the Steiner forest problem on planar graphs and, more generally, on graphs of bounded genus. As a first step, we s…

astro-ph.GA2009★ 72 cited

Localising the VHE gamma-ray source at the Galactic Centre