Showing 2008Show all

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hep-ex2008★ 25 cited

Search for anomalous top quark couplings with the D0 detector

D0 Collaboration, V. Abazov

Anomalous Wtb couplings modify the angular correlations of the top quark decay products and change the single top quark production cross section. We present limits on anomalous top…

astro-ph.GA2008★ 5 cited

Cosmic-ray driven dynamo in galactic disks

M. Hanasz, K. Otmianowska-Mazur, H. Lesch +6

We present new developments on the Cosmic--Ray driven, galactic dynamo, modeled by means of direct, resistive CR--MHD simulations, performed with ZEUS and PIERNIK codes. The dynamo…

quant-ph2008★ 57 cited

Experimental implementation of a four-player quantum game

Christian Schmid, Adrian P. Flitney, Witlef Wieczorek +3

Game theory is central to the understanding of competitive interactions arising in many fields, from the social and physical sciences to economics. Recently, as the definition of i…

hep-ph2008★ 2 cited

Supersymmetric dark matter, catalyzed BBN, and heavy moduli in mSUGRA with gravitino LSP and stau NLSP

Grigoris Panotopoulos

In mSUGRA model we assume that gravitino, the LSP, plays the role of cold dark matter in the universe, while the lightest stau, the NLSP, catalyzes primordial BBN reconciling the d…

astro-ph2008★ 82 cited

Cosmic ray driven dynamo in galactic disks. A parameter study

Michał Hanasz, Katarzyna Otmianowska-Mazur, Grzegorz Kowal +1

We present a parameter study of the magnetohydrodynamical dynamo driven by cosmic rays in the interstellar medium (ISM) focusing on the efficiency of magnetic field amplification a…

hep-th2008★ 18 cited

Moduli Webs and Superpotentials for Five-Branes

Marco Baumgartl, Simon Wood

We investigate the one-parameter Calabi-Yau models and identify families of D5-branes which are associated to lines embedded in these manifolds. The moduli spaces are given by sets…

cond-mat.supr-con2008★ 94 cited

Competition of magnetism and superconductivity in underdoped (Ba1-xKx)Fe2As2

Marianne Rotter, Marcus Tegel, Inga Schellenberg +7

Polycrystalline samples of underdoped (Ba1-xKx)Fe2As2 (x<=0.4) were synthesized and studied by x-ray powder diffraction, magnetic susceptibility, specific heat and 57Fe-Moessbauer-…

nucl-th2008★ 12 cited

The High-Density Symmetry Energy in Heavy Ion Collisions

H. H. Wolter, V. Prassa, G. A. Lalazissis +4

The nuclear symmetry energy as a function of density is rather poorly constrained theoretically and experimentally both below saturation density, but particularly at high density,…

cond-mat.soft2008★ 18 cited

A freely relaxing polymer remembers how it was straightened

B. Obermayer, W. Mobius, O. Hallatschek +2

The relaxation of initially straight semiflexible polymers has been discussed mainly with respect to the longest relaxation time. The biologically relevant non-equilibrium dynamics…

astro-ph2008

The Challenge of Modelling Galactic Disks

Andreas Burkert

Detailed models of galactic disk formation and evolution require knowledge about the initial conditions under which disk galaxies form, the boundary conditions that affect their se…

hep-th2008★ 12 cited

Towards Holographic Renormalization of Fake Supergravity

Natalia Borodatchenkova, Michael Haack, Wolfgang Mueck

A step is made towards generalizing the method of holographic renormalization to backgrounds which are not asymptotically AdS, corresponding to a dual gauge theory which has logari…

hep-th2008★ 78 cited

Large hierarchies from approximate R symmetries

Rolf Kappl, Hans Peter Nilles, Saul Ramos-Sanchez +3

We show that hierarchically small vacuum expectation values of the superpotential in supersymmetric theories can be a consequence of an approximate R symmetry. We briefly discuss t…

cond-mat.str-el2008★ 109 cited

Quantum quenches from integrability: the fermionic pairing model

Alexandre Faribault, Pasquale Calabrese, Jean-Sebastien Caux

Understanding the non-equilibrium dynamics of extended quantum systems after the trigger of a sudden, global perturbation (quench) represents a daunting challenge, especially in th…

cs.LO2008★ 47 cited

Resolution Trees with Lemmas: Resolution Refinements that Characterize DLL Algorithms with Clause Learning

Samuel R. Buss, Jan Hoffmann, Jan Johannsen

Resolution refinements called w-resolution trees with lemmas (WRTL) and with input lemmas (WRTI) are introduced. Dag-like resolution is equivalent to both WRTL and WRTI when there…

cond-mat.mes-hall2008★ 82 cited

Defect Induced Photoluminescence from Dark Excitonic States in Individual Single-Walled Carbon Nanotubes

Hayk Harutyunyan, Tobias Gokus, Alexander A. Green +3

We show that new low-energy photoluminescence (PL) bands can be created in semiconducting single-walled carbon nanotubes by intense pulsed excitation. The new bands are attributed…

cond-mat.str-el2008★ 120 cited

A real-time study of diffusive and ballistic transport in spin-1/2 chains using the adaptive time-dependent density matrix renormalization group method

S. Langer, F. Heidrich-Meisner, J. Gemmer +2

Using the adaptive time-dependent density matrix renormalization group method, we numerically study the spin dynamics and transport in one-dimensional spin-1/2 systems at zero temp…

math-ph2008★ 16 cited

Canonical quantization of motion on submanifolds

Alexey V. Golovnev

This is an extended version of the talk given by the Author at the 40th Symposium on Mathematical Physics held in Torun, Poland, June 25-28, 2008. We review the methods of canonica…

astro-ph2008★ 128 cited

The halo merger rate in the Millennium Simulation and implications for observed galaxy merger fractions

S. Genel, R. Genzel, N. Bouché +2

We developed a new method to extract halo merger rates from the Millennium Simulation. First, by removing superfluous mergers that are artifacts of the FOF halo finder, we find a l…

hep-th2008★ 46 cited

Stationary Measure in the Multiverse

Andrei Linde, Vitaly Vanchurin, Sergei Winitzki

We study the recently proposed "stationary measure" in the context of the string landscape scenario. We show that it suffers neither from the "Boltzmann brain" problem nor from the…

cond-mat.str-el2008★ 63 cited

Electron correlations in CoMnFeSi Heusler compounds

S Chadov, G. H. Fecher, C. Felser +3

This study presents the effect of local electronic correlations on the Heusler compounds CoMnFeSi as a function of the concentration . The analysis has been perf…

astro-ph2008★ 33 cited

Non-LTE line formation for Pr II and Pr III in A and Ap stars

L. Mashonkina, T. Ryabchikova, A. Ryabtsev +1

Non-LTE line formation for Pr II and Pr III is considered through a range of effective temperatures between 7250 K and 9500 K. A comprehensive model atom for Pr II/III is based on…

quant-ph2008★ 3 cited

Addendum to "Experimental demonstration of a quantum protocol for Byzantine agreement and liar detection" arXiv:0710.0290

Sascha Gaertner, Mohamed Bourennane, Christian Kurtsiefer +2

Gao et al. [Phys. Rev. Lett. 101, 208901 (2008)] have described a possible intercept-resend attack for the quantum protocol for detectable Byzantine agreement in Phys. Rev. Lett. 1…

nucl-th2008★ 8 cited

Asymmetry of velocity distributions in peripheral collisions at Fermi energies

T. I. Mikhailova, B. Erdemchimeg, G. Kaminski +6

Asymmetry of the velocity distributions of projectile like fragments produced in heavy-ion collisions is discussed. The calculations made in transport model approach (the solution…

cond-mat.str-el2008★ 8 cited

Effect of chemical disorder on NiMnSb investigated by Appearance Potential Spectroscopy: a theoretical study

J Minár, J Braun, S Bornemann +2

The half-Heusler alloy NiMnSb is one of the local-moment ferromagnets with unique properties for future applications. Band structure calculations predict exclusively majority bands…