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LECTURE 42
Inner Space/Outer Space: Particle Physics Meets Cosmology
Ch 19, pp 248-251. I have also written up supplementary notes for the subject.
1. High Energy is Short Distance is Early Times
2. Symmetries and Unified Field THeory
3. Scales of Size
4. Science News in Your Future
...the symmetry between the left and the right, is as old as human
civilization...debated at length by philosophers of the past.
To decide unequivocally whether parity is conserved in weak interactions,
one must perform an experiment to determine whether weak interactions
differentiate the right from the left. (One must) measure the angular
distribution
of the electrons coming from beta-decays of oriented nuclei...
(This was done late in 1956 by Chien-Shiung Wu: Lee received a phone call
from her that there was a rather large asymmetry in the angular distribution.)
On reflecting a neutrino in a mirror, one sees nothing.
The fact that the large difference in the masses of the muon and the electron
does not seem to induce other differences in their properties is one of the most fascinating in contemporary physics.
...the discovery of non-vanishing neutrino masses would shed light on the theory
beyond the standard model; thus it is one of the important issues
experimentalists have to address.
Please email any questions, comments, or suggestions to Professor Bernice Durand, bdurand@theory3.physics.wisc.edu. Revised December 3, 1997.
Images and layout © 1997, Shane Hamilton |