Showing papers by "Graciela B. Gelmini published in 2001"
TL;DR: In this article, the expected phase of the annual modulation of a weakly interacting massive particle (WIMP) halo signal in direct detection experiments is opposite to the one usually expected.
Abstract: We show that in the late-infall model of our galactic halo of Sikivie the expected phase of the annual modulation of a weakly interacting massive particle (WIMP) halo signal in direct detection experiments is opposite to the one usually expected. If a nonvirialized halo component due to the infall of (collisionless) dark matter particles cannot be rejected, an annual modulation in a dark matter signal should be looked for by experimenters without fixing the phase a priori. Moreover, WIMP streams coming to Earth from directions above and below the galactic plane should be expected, with a characteristic pattern of arrival directions.
139 citations
TL;DR: In this paper, the authors estimate the magnitude of the signals expected for realistic cosmic neutrino background in detectors attempting to measure the mechanical forces exerted on macroscopic targets by the elastic scattering of relic neutrinos.
Abstract: Here we estimate the magnitude of the signals expected for realistic cosmic neutrino backgrounds in detectors attempting to measure the mechanical forces exerted on macroscopic targets by the elastic scattering of relic neutrinos. We study effects proportional to the weak coupling constant ${G}_{F}$ and to ${G}_{F}^{2}$ for Dirac and Majorana neutrinos, either relativistic or nonrelativistic, both gravitationally bound or not.
61 citations
TL;DR: In this paper, the authors analyzed the possibility that neutrino telescopes may provide an experimental determination of the slope of the gluon distribution in the proton at momentum fractions x smaller than the accelerator reach.
Abstract: We analyze the possibility that neutrino telescopes may provide an experimental determination of the slope $\ensuremath{\lambda}$ of the gluon distribution in the proton at momentum fractions x smaller than the accelerator reach. The method is based on a linear relation between $\ensuremath{\lambda}$ and the spectral index (slope) of the down-going atmospheric muon flux above 100 TeV, for which there is no background. Considering the uncertainties in the charm production cross section and in the cosmic ray composition, we estimate the error on the measurement of $\ensuremath{\lambda}$ through this method, excluding the experimental error of the telescopes, to be $\ifmmode\pm\else\textpm\fi{}0.2.$
7 citations
01 Jan 2001
TL;DR: In this article, it was shown that neutrinos with mass in the range indicated by Super-Kamiokande results if neutrino masses are hierarchial (about 0.07 eV) are many times deemed too light to be cosmologically relevant.
Abstract: Relic neutrinos with mass in the range indicated by Super-Kamiokande results if neutrino masses are hierarchial (about 0.07 eV) are many times deemed too light to be cosmologically relevant. Here we remark that these neutrinos may significantly contribute to the dark matter of the Universe (with a large lepton asymmetry L) and that their existence might be revealed by the spectrum of ultra high energy cosmic rays (maybe even in the absence of a large L).
2 citations