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Prof. Richard P. Feynman ( ) Feynman’s Lectures on Physics, V. 3:
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Photons in a permutation anti-symmetric state?
and
What would a quantum-statistic violation mean?
Dmitry Budkerhttp://socrates.berkeley.edu/~budker
Inauguration MeetingIceland, July 2007
Support: N$F
Identical particles: the ultimate equality
• Permutation symmetry postulate
• Spin-Statistics Theorem (SST)
Individualism: the ultimate diversity
Prof. Richard P. Feynman(1918-1988)
Feynman’s Lectures on Physics, V. 3:
How? Landau-Yang Theorem!Landau, L. D., Dokl. Akad. Nauk., USSR 60, 207-
209 (1948)
Doesn’t go because no symmetric statefor two photons with J=1
Landau-Yang theorem and the Landau-Yang theorem and the degenerate two-photon transition degenerate two-photon transition
selection ruleselection rule • L-Y:L-Y: V(J=1) V(J=1)
• Inverse L-Y:Inverse L-Y: Nothing(J=0) + Nothing(J=0) + V(J=1) V(J=1)
MJ=0MJ=-1 MJ=1
1
12
2
Destructive interference of two quantum paths
S. N. Bose
DeMille 11999
Interaction region
Lasers
Results
Results
Numbers
Damon English
Disturbing Questions• No consistent relativistic theory accommodating
a statistics violation
• How to compare with other experiments? (Z→γγ, …)
• Constrains from lasers, BBR, static limit ?
Need a generalized E&M theory