2,884 research outputs found
The Five Instructions
Five elementary lectures delivered at TASI 2011 on the Standard Model, its
extensions to neutrino masses, flavor symmetries, and Grand-Unification
Still in Light-Cone Superspace
The recently formulated Bagger-Lambert-Gustavsson (BLG) theory in three
dimensions is described in terms of a constrained chiral superfield in
light-cone superspace. We discuss the use of Superconformal symmetry to
determine the form of its interactions, in complete analogy with N=4
SuperYang-Mills in four dimensions.Comment: Invited Talk at Shifmania, St PAul-Minneapolis, May 200
Neutrinos: Windows to Planck Physics
After recalling some elegant contributions of the late Freydoon Mansouri, we
turn to neutrino physics and use a {\it modicum} of grand unification to relate
quark and lepton mixing matrices. We advocate an expansion for the MNS matrix,
{\it \`a la} Wolfenstein, and argue that in a wide class of models,
is a Cabibbo mixing effect. Also the large neutrino mixing angles
reflect the mass patterns of the right-handed neutrinos near the Planck scale,
and provide evidence for family structure at that scale.Comment: COntribution to Quantum Theory and Symmetries COnference, Univ of
Cincinatti, October 2003; Latex, 11 page
Mass Hierarchies from Anomalies: a Peek Behind the Planck Curtain
The masses of quarks and leptons suggest a strong hierarchical structure. We
argue that their patterns can be reproduced through the introduction of a new
Abelian symmetry. The data suggest that this symmetry is anomalous. We suggest
that the cancellation of its anomalies occur through the Green-Schwarz
mechanism. An important check of this idea is that it links the Weinberg angle
to a mass ratio of the elementary fermions. The Green-Schwarz mechanism occurs
naturally in many superstring compactifications, and produces a small
parameter, which we use to determine the quark mass hierarchy. We show that
hierarchy and mixings among the chiral fermions is a consequence of the
Green-Schwarz mechanism. We present several models where this idea is realized.Comment: Based on a talk delivered in the honor of Professor K. Kikkawa's 60th
birthday, December 1995, Osaka, Japan. Latex, 15 pages, macros include
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