Showing papers in "Astroparticle Physics in 2005"

TL;DR: In this paper, a composition analysis of KASCADE air shower data is performed by means of unfolding the two-dimensional frequency spectrum of electron and muon numbers, and the analysis is the determination of energy spectra for elemental groups representing the chemical composition of primary cosmic rays.

TL;DR: In this article, a new analysis of the primordial 4He mass fraction is presented, based on which a host of particle properties such as the number of relativistic species at the time of BBN, the variations of fundamental couplings such as αem and GN, and limits on decaying particles are derived.

TL;DR: In this paper, a semi-empirical model was used to develop the hadronic portion of air showers in a manner analogous to the well-known Heitler splitting approximation of electromagnetic cascades.

TL;DR: In this article, the authors presented the first significant limits on WIMP dark matter by the phonon-light technique, where combined phonon and light signals from a scintillating cryogenic detector are used.

TL;DR: In this paper, the authors estimate the accuracy with which the matter power spectrum will need to be calibrated in order not to contribute appreciably to the error budget for future weak lensing surveys.

TL;DR: In this article, the authors describe a mechanism of the primordial black hole formation that can explain the existence of a population of supermassive black holes in galactic bulges, based on the formation of black holes from closed domain walls.

TL;DR: The ANTARES neutrino telescope is a large photomultiplier array designed to detect neutrinos induced upward-going muons by their Cherenkov radiation as discussed by the authors.

TL;DR: In this article, the authors measured the spectrum of UHE cosmic rays using the Flash ADC (FADC) detector (called HiRes-II) of the High Resolution Fly-s Eye experiment running in monocular mode.

TL;DR: In this article, the authors calculate the flux of neutrinos generated by the propagation of ultra-high energy iron over cosmological distances and show that even if ultra high energy cosmic rays are composed of heavy nuclei, a significant flux of high-energy neutrino should be present throughout the universe.

TL;DR: The first results from the ZEPLIN I detector were reported in this paper, based on measurement of scintillation pulse shapes in a liquid xenon target of 3.2 kg fiducial mass.

TL;DR: In this article, a Monte Carlo simulation of cosmic ray propagation through intragalactic radiation fields is used to assess the impact of the altered neutrino fluxes on next-generation Neutrino telescopes.

TL;DR: In this article, the impact on the photodisintegration of ultra-high-energy cosmic rays (UHECR) is illustrated for a Fe source with typical energies of 1020-1021 eV.

TL;DR: In this article, the FLUKA results on the atmospheric neutrino flux below 100 MeV were presented, down to 10 MeV, and the interaction of these neutrinos were detected by high resolution liquid argon detectors.

TL;DR: In this paper, a sophisticated model of the radio emission from extensive air showers in the scheme of coherent geosynchrotron radiation was developed, providing a theoretical foundation for the interpretation of experimental data from current and future experiments.

TL;DR: In this article, an experimental upper limit of the mirror residual seismic noise at a few Hertz is provided, which is lower than the thermal noise floor, expected to limit the antenna sensitivity in the low frequency range.

TL;DR: A module of the NESTOR underwater neutrino telescope was deployed at a depth of 3800 m in order to test the overall detector performance and particularly that of the data acquisition systems.

TL;DR: In this paper, the authors report on detailed charging simulations with the Geant4 toolkit, using comprehensive geometry and physics models, for Galactic cosmic-ray protons and helium nuclei.

TL;DR: In this article, a sample of hundreds of simulated galaxy clusters is used to study the statistical properties of galaxy cluster formation, individual assembly histories are discussed, the degree of virialization is demonstrated and various commonly used formation times are measured and intercompared.

TL;DR: The CLEAN approach as mentioned in this paper uses a thin film of wavelength-shifting fluor to convert the ultraviolet scintillation light to the visible, thereby allowing detection by conventional photomultipliers.

TL;DR: In this article, the authors localize the primordial features in observations of galaxy spectra which necessarily involve galaxy bias, non-linear evolution and redshift space distortions, and present calculations, based on mock catalogues produced from particle-mesh simulations, which show the range of behaviors we might expect of galaxies in the real universe.

TL;DR: In this paper, the authors investigated whether circumstances exist where the source can produce the flux implied by the coincident events and showed that if the TeV gamma-ray emission observed from 1ES 1959 + 650 or other nearby TeV blazars is the result of accelerated protons interacting with nucleons, it is reasonable that AMANDA could detect several events during a flaring period.

TL;DR: In this paper, a detailed evaluation of the expected number of Earth-skimming tau neutrinos has been performed for a wide class of neutrino flux models and an updated computation of the neutrini-nucleon cross section and of the tau energy losses has been carried out.

TL;DR: In this article, the AMANDA-B10 detector was searched for a diffuse flux of neutrinos of all flavors with energies above 10 16 −eV, and no excess events above the background expectation were observed.

TL;DR: In this paper, a quenching model based on a biexcitonic diffusion-reaction mechanism was proposed for electronic quenches, which was compared with experimental results reported for nuclear recoils from neutrons.

TL;DR: In this paper, a near visual UV radiation (NUV) from the Earth atmosphere was measured during the moon month and the results of previous measurements were confirmed: NUV intensity is in limits of 3 × 107 − 108 − 108 -photons/cm2 s−s−sr.

TL;DR: In this article, the effect of three flavor oscillations on the neutrino flux was investigated and the effect on the muon flux induced by these high energy neutrinos was investigated.

TL;DR: In this article, a small amount of Lorentz invariance violation (LIV), which could turn off photomeson interactions of ultra-high energy cosmic rays with the cosmic background radiation (CBR), could explain the UHECR spectrum as measured by AGASA.

TL;DR: In this paper, the authors examined the tradeoff of "curving" the vacuum but retaining spatial flatness, vs. curving space but retaining the cosmological constant, and showed that the curvature can still be measured to 1%, but at the price of degrading estimation of the equation of state time variation by 60% or more, unless additional information (such as weak lensing data or a tight matter density prior) is included.

TL;DR: In this article, the neutrino flux from two kinds of active galactic nuclei (AGN) sources was estimated assuming pγ interactions in the jets of the AGN, and the result is highly dependent on the proton's index of the energy spectrum.

TL;DR: In this paper, the mean square deflection of the ultra-high energy cosmic rays (UHECR) caused by the random component of the Galactic magnetic field (GMF) in terms of the GMF power spectrum was analyzed.