3,658 research outputs found

    New Physics Potential with a Neutrino Telescope

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    Active Galactic Nuclei are considered as sources of neutrinos, with neutrino energies extending up to 10^{18} eV. It is expected that these highly energetic cosmic neutrinos will be detected by the neutrino telescopes, presently under construction. The detection process is very sensitive to the total muon neutrino cross-section. We examine how the total cross section changes at high energies, by the single production of excited fermions (excited muon and muon-neutrino). For parameters (masses, couplings) of the excited fermions allowed by the experimental constraints, we find that for energies of the incoming muon-neutrino above 100 TeV the cross-section for single production of (excited muon and muon-neutrino) supersedes the standard total cross-section.Comment: 12 pages and 2 figures; typset using revtex; postscript files for the figures provide

    Mycenaean Textile Memories in Homeric Terminology

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    The present paper aims at investigating continuity and disruption between Mycenaean and Homeric Greek in the field of technical terminology pertaining to the textile craft. The objective of the work is a reconsideration of the main verbs (ὑφαίνω, τολυπεύω, ῥάπτω, ἐπικλώθω), bearing the notion of "to weave", into these two phases of the Greek language. Surprisingly we can also highlight the semantic shift – in the reason of the different chronology and contexts of use – which characterises the textile terminology. We know, indeed, that the use of the terminology of work (particularly of the manual labour) in relation with the terminology for intellectual activities (planning, ideation, writing, playing music etc.) can be considered a topos in many Indo-European traditions. Following this path of reasoning, most of the terms in the Linear B tablets drawn for manufacturing crafts (such as carpentry or weaving) assume in the Homeric epics a metaphorical meaning

    Shadowing of Ultrahigh Energy Neutrinos

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    The rise with energy of the neutrino--nucleon cross section implies that at energies above few TeV the Earth is becoming opaque to cosmic neutrinos. The neutrinos interact with the nucleons through the weak charged current, resulting into absorption, and the weak neutral current, which provides a redistribution of the neutrino energy. We Mellin transform the neutrino transport equation and find its exact solution in the moment space. A simple analytical formula is provided, which describes accurately the neutrino spectrum, after the neutrinos have traversed the Earth. The effect of the weak neutral current is most prominent for an initial flat neutrino spectrum and we find that at low energies (around 1 TeV) the neutrino intensity is even enhanced.Comment: gziped, tar file of LaTeX paper plus 2 postscript figures, 13 page
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