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19932026
Showing 2007Show all

163 papers · 1 filter

gr-qc2007★ 3 cited

Extended Schouten classification for non-Riemannian geometries

S. Casanova, O. M. Lecian, G. Montani +2

A generalized connection, including Christoffel coefficients, torsion, non-metricity tensor and metric-asymmetricity object, is analyzed according to the Schouten classification. T…

astro-ph2007★ 212 cited

HESS VHE Gamma-Ray Sources Without Identified Counterparts

HESS Collaboration, F. Aharonian

The detection of gamma rays in the very-high-energy (VHE) energy range (100 GeV--100 TeV) provides a direct view of the parent population of ultra-relativistic particles found in a…

quant-ph2007★ 45 cited

Photo-Emission of a Single-Electron Wave-Packet in a Strong Laser Field

Justin Peatross, Carsten Müller, Karen Z. Hatsagortsyan +1

The radiation emitted by a single-electron wave packet in an intense laser field is considered. A relation between the exact quantum formulation and its classical counterpart is es…

physics.data-an2007★ 8 cited

Goodness of fit tests for weighted histograms

N. D. Gagunashvili

Weighted histogram in Monte-Carlo simulations is often used for the estimation of a probability density function. It is obtained as a result of random experiment with random events…

astro-ph2007★ 83 cited

Variable VHE gamma-ray emission from non-blazar AGNs

F. M. Rieger, F. A. Aharonian

The observation of rapidly variable very high energy (VHE) gamma-rays from non-aligned active galactic nuclei (AGNs), as reported from M87, proves challenging for conventional theo…

astro-ph2007★ 128 cited

On the Evolution of and High-Energy Emission from GHz-Peaked-Spectrum Sources

L. Stawarz, L. Ostorero, M. C. Begelman +3

Here we discuss evolution and broad-band emission of compact (< kpc) lobes in young radio sources. We propose a simple dynamical description for these objects, consisting of a rela…

physics.plasm-ph2007★ 39 cited

Harmonic emission from cluster nanoplasmas subject to intense short laser pulses

S. V. Popruzhenko, M. Kundu, D. F. Zaretsky +1

Harmonic emission from cluster nanoplasmas subject to short intense infrared laser pulses is studied. In a previous publication [M. Kundu et al., Phys. Rev. A 76, 033201 (2007)] we…

hep-ex2007★ 24 cited

Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA

H1 Collaboration

The production of isolated photons in deep-inelastic scattering is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negati…

quant-ph2007★ 28 cited

Nonlinear Effects in Pulse Propagation through Doppler-Broadened Closed-Loop Atomic Media

Robert Fleischhaker, Jörg Evers

Nonlinear effects in pulse propagation through a medium consisting of four-level double--type systems are studied theoretically. We apply three continous-wave driving fields and…

astro-ph2007★ 2 cited

Studying the interaction between microquasar jets and their environments

M. Perucho, V. Bosch-Ramon

In high-mass microquasars (HMMQ), strong interactions between jets and stellar winds at binary system scales could occur. In order to explore this possibility, we have performed nu…

astro-ph2007★ 40 cited

Upper Limits from HESS AGN Observations in 2005-2007

HESS Collaboration, F. Aharonian

AIMS: Very high energy (VHE; E>100 GeV) gamma-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. METHODS: VHE observations of a sample of…

astro-ph2007

Search for Ultra High-Energy Neutrinos with AMANDA-II

The IceCube Collaboration, M. Ackermann

A search for diffuse neutrinos with energies in excess of 10^5 GeV is conducted with AMANDA-II data recorded between 2000 and 2002. Above 10^7 GeV, the Earth is essentially opaque…

astro-ph2007★ 36 cited

Theoretical fits of the δCephei light, radius and radial velocity curves

Giovanni Natale, Marcella Marconi, Giuseppe Bono

We present a theoretical investigation of the light, radius and radial velocity variations of the prototype Cephei. We find that the best fit model accounts for luminosity and…

astro-ph2007★ 25 cited

Constraints on the TeV source population and its contribution to the galactic diffuse TeV emission

Sabrina Casanova, Brenda L. Dingus

The detection by the HESS atmospheric Cerenkov telescope of fourteen new sources from the Galactic plane makes it possible to estimate the contribution of unresolved sources like t…

hep-ex2007★ 4 cited

Three- and Four-jet Production at Low x at HERA

H1-Collaboration

Three- and four-jet production is measured in deep-inelastic scattering at low and with the H1 detector using an integrated luminosity of . Sev…

astro-ph2007★ 8 cited

The magnetron instability in a pulsar's cylindrical electrosphere

Jerome Petri

(abridged) The physics of the pulsar magnetosphere remains poorly constrained by observations. Little is known about their emission mechanism. Large vacuum gaps probably exist, and…

astro-ph2007★ 98 cited

Observations of the Sagittarius Dwarf galaxy by the H.E.S.S. experiment and search for a Dark Matter signal

HESS Collaboration, F. Aharonian

Observations of the Sagittarius dwarf spheroidal (Sgr dSph) galaxy were carried out with the H.E.S.S. array of four imaging air Cherenkov telescopes in June 2006. A total of 11 hou…

hep-lat2007★ 13 cited

Formulating Light Cone QCD on the Lattice

D. Grunewald, E. -M. Ilgenfritz, E. V. Prokhvatilov +1

We present the near light cone Hamiltonian in lattice QCD depending on the parameter , which gives the distance to the light cone. Since the vacuum has zero momentum we can…

hep-ph2007★ 95 cited

Flavor Ratios of Astrophysical Neutrinos: Implications for Precision Measurements

Sandip Pakvasa, Werner Rodejohann, Thomas J. Weiler

We discuss flavor-mixing probabilities and flavor ratios of high energy astrophysical neutrinos. In the first part of this paper, we expand the neutrino flavor-fluxes in terms of t…

quant-ph2007★ 4 cited

The role of the atom-cavity detuning in bimodal cavity experiments

D. Gonta, S. Fritzsche

The coherent evolution of the atom-cavity state in bimodal (cavity) experiments has been analyzed for a realistic time-dependence in detuning the atomic transition frequency. Apart…

physics.atom-ph2007★ 11 cited

Intrinsic channel closing in strong-field single ionization of H2

Stefan Pieper, Manfred Lein

The ionization of H2 in intense laser pulses is studied by numerical integration of the time-dependent Schrödinger equation for a single-active-electron model including the vibrati…

math-ph2007★ 16 cited

Structure, Time Propagation and Dissipative Terms for Resonances

U. D. Jentschura, A. Surzhykov, M. Lubasch +1

For odd anharmonic oscillators, it is well known that complex scaling can be used to determine resonance energy eigenvalues and the corresponding eigenvectors in complex rotated sp…

quant-ph2007★ 20 cited

Negative refraction with tunable absorption in an active dense gas of atoms

P. P. Orth, R. Hennig, C. H. Keitel +1

Applications of negative index materials (NIM) presently are severely limited by absorption. Next to improvements of metamaterial designs, it has been suggested that dense gases of…

hep-ph2007★ 85 cited

TriMinimal Parametrization of the Neutrino Mixing Matrix

Sandip Pakvasa, Werner Rodejohann, Thomas J. Weiler

Current experimental data on neutrino mixing are very well described by TriBiMaximal mixing. Accordingly, any phenomenological parametrization of the MNSP matrix must build upon Tr…