24,520 research outputs found
High Energy Cosmic Tau Neutrinos
I discuss the possibility of production of high energy cosmic tau neutrinos
( GeV) in an astrophysical site and study some of the effects of
neutrino mixing on their subsequent propagation. I also discuss the prospects
for observations of these high energy cosmic tau neutrinos through double
shower events in new km surface area under water/ice neutrino telescopes.Comment: 3 pages, Latex (uses espcrc2), 1 figure included with epsf, talk
given at 6th International Workshop on Topics in Astroparticle and
Underground Physics (TAUP 99), 6-10 September, Paris, France [to appear in
its proceedings in Nucl. Phys. B (Proc. Suppl.) edited by M. Froissart, J.
Dumarchez and D. Vignaud
Ultraviolet behavior in background independent quantum field theory
We describe a background independent quantization of the scalar field that
provides an explicit realization of Fock-like states and associated operators
in a polymer Hilbert space. The vacuum expectation values of the commutator and
anti-commutator of the creation and annihilation operators become energy
dependent, and exhibit a surprising transition to fermionic behavior at high
energy. Furthermore the approach yields a modified dispersion relation with a
leading correction proportional to the momentum cubed. These results suggests a
fundamental change in the ultraviolet properties of quantum fields.Comment: 8 pages, 5 figure
Neutrino Conversions in Active Galactic Nuclei
I discuss the possibility of production of high energy cosmic neutrinos (E
\geq 10^{6} GeV) in cores of active galactic nuclei and study some of the
effects of neutrino mixing on their subsequent propagation. I also discuss the
prospects for observations of these high energy cosmic neutrinos in new km^{2}
surface area underwater/ice neutrino telescopes.Comment: 7 pages, Latex, 1 figure included with epsf, talk given at 9th
Lomonosov Conference on Elemenatry Particle Physics, 20-26 September, 1999,
Moscow, Russia [to appear in its proceedings edited by A. Studeniken
The Affine symmetry of self-dual gravity
Self-dual gravity may be reformulated as the two dimensional principal chiral
model with the group of area preserving diffeomorphisms as its gauge group.
Using this formulation, it is shown that self-dual gravity contains an infinite
dimensional hidden symmetry whose generators form the Affine (Kac-Moody)
algebra associated with the Lie algebra of area preserving diffeomorphisms.
This result provides an observable algebra and a solution generating technique
for self-dual gravity.Comment: 20 pages, RevTex, a few presentational changes - version to appear in
J. Math. Phy
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