25,264 research outputs found
Neutrino Oscillations at Proton Accelerators
Data from many different experiments have started to build a first glimpse of the phenomenology associated with neutrino oscillations. Results on atmospheric and solar neutrinos are particularly clear while a third result from LSND suggests a possibly very complex oscillation phenomenology. As impressive as the results from current experiments are, it is clear that we are just getting started on a long-term experimental program to understand neutrino masses, mixings and the physics which produce them. A number of exciting fundamental physics possibilities exist, including that neutrino oscillations could demonstrate CP or CPT violation and could be tied to exotic high-energy phenomena including strings and extra dimensions. A complete exploration of oscillation phenomena demands many experiments, including those possible using neutrino beams produced at high energy proton accelerators. Most existing neutrino experiments are statistics limited even though they use gigantic detectors. High intensity proton beams are essential for producing the intense neutrino beams which we need for next generation neutrino oscillation experiments
Effective potential and warp factor dynamics
We define an effective potential describing all massless and massive modes in
the supergravity limit of string/M theory compactification which is valid
off-shell, i.e. without imposing the equations of motion. If we neglect the
warp factor, it is unbounded below, as is the case for the action in Euclidean
quantum gravity. By study of the constraint which determines the warp factor,
we solve this problem, obtaining a physically satisfying and tractable
description of the dynamics of the warp factor.Comment: 32 pages, JHEP3.cls. v4: added reference to hep-th/050715
Basic results in Vacuum Statistics
A review of recent work on constructing and finding statistics of string
theory vacua, done in collaboration with Frederik Denef, Bogdan Florea, Bernard
Shiffman and Steve Zelditch.Comment: 11 pages, 5 figures (Latex elsart.cls, included
Enhanced Gauge Symmetry in M(atrix) Theory
We discuss the origin of enhanced gauge symmetry in ALE (and K3)
compactification of M theory, either defined as the strong coupling limit of
the type IIa superstring, or as defined by Banks et al. In the D-brane
formalism, wrapped membranes are D0 branes with twisted string boundary
conditions, and appear on the same footing with the Kaluza-Klein excitations of
the gauge bosons. In M(atrix) theory, the construction appears to work for
arbitrary ALE metric.Comment: 10 pp, harvma
Some Comments on QCD String
We try to draw lessons for higher dimensions from the string representations
recently derived for large Yang-Mills theory by Gross and Taylor, Kostov,
and others, and call attention to three characteristics that should be expected
of a string theory precisely equivalent to a higher dimensional gauge theory:
continuous world-sheets; strong coupling at short distances; and negative
weights. To appear in the proceedings of the Strings '93 Berkeley conference.Comment: RU-94-9. (harvmac, 9 pp.
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