Ultra-high energy cosmic neutrinos

Several cosmologically distant astrophysical sources may produce ultra-high energy cosmic neutrinos (E > 10^6 GeV) of all flavors above the atmospheric neutrino background. I study the effects of vacuum neutrino flavor mixing on this cosmic neutrino flux. Prospects for observations of these ultra-high energy cosmic neutrinos in large underwater/ice neutrino telescopes are also briefly discussed.Comment: 3 pages, latex, talk given at the 8th Asia Pacific Physics Conference (APPC2000), 7-10 August, 2000, Taipei, Taiwan (to appear in its proceedings

High Energy Astrophysical Tau Neutrinos: The Expectations

Aspects related to production, propagation and prospects for observationsof high energy astrophysical tau neutrinos originating from some representativeextra terrestrial sources such as atmosphere of earth, our galactic plane as well as possibly from distantsites of gamma ray bursts in the energy range 10^3 < E\GeV < 10^11 are reviewed.Comment: 4 pages, 3 figures, talk given at 12th International Symposium on Very High Energy Cosmic Ray Interactions (XII ISVHERCI), 15-20 July, 2002, Geneva, Switzerland [to appear in its proceedings to be published by Nucl. Phys. B (Proc. Suppl.)

On non hadronic origin of high energy neutrinos

Some of the non hadronic interactions, such as the \eta resonance formation in the \gamma \gamma interactions and the muon pair production in the e\gamma interactions, are identified as possible source interactions for generating high energy neutrinos in the cosmos.Comment: 9 pages, 1 figure, talk given at First NCTS Workshop on Astroparticle Physics, 6-9 December, 2001, Kenting, Taiwan (to appear in its proceedings edited by H. Athar, Guey-Lin Lin, and K.-W. Ng

Fostering south-south research collaborations

This repository item contains a single issue of Issues in Brief, a series of policy briefs that began publishing in 2008 by the Boston University Frederick S. Pardee Center for the Study of the Longer-Range Future.This policy brief reviews the state of research collaborations between and amongst developing country scholars – South-South research collaborations and develops a rationale for a more systematic and multilateral approach to such endeavors