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High Energy Physics Seminar

Monday, October 21, 2013
4:00pm to 5:00pm
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Lauritsen 469
On Spin, Long-Range Forces, and Lorentz-transformation of Helicity
Natalia Toro, Perimeter Institute,

Many basic features of long-distance physics can be derived from the consistent interactions of particles with spin in flat space.   But Lorentz-invariance allows a more general notion of "spin" for free massless particles than is generally considered -- Wigner's so-called "continuous spin" representations.  After introducing what a continuous spin particle (or CSP) would mean and relating it to the familiar case of massless (half)-integer helicity particles, I will summarize recent results suggesting that CSPs can consistently interact and progress in describing them via field-theory.
I will also elaborate on the surprising finding that CSP interactions mimic those of standard helicity 0,1, and 2 theories.
References: arXiv:1302.1198,arXiv:1302.1577, arXiv:1302.3225

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