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BEGIN:VEVENT
DTSTAMP:20261022T073548Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20090330T163000Z
DTEND:20090330T173000Z
UID:event400@bu.edu
URL:http://physics.bu.edu/internal/events/show/400
SUMMARY:Superluminal travel in two dimensions
DESCRIPTION:Featuring Sergei Dubovsky\, Stanford University\n\nPart of the 
	HET Seminar Series.\n\nAbstract:\n"We argue that superluminal signal propag
	ation is possible in consistent Poincare invariant quantum field theories i
	n two space-time dimensions\, provided spatial parity is broken. This happe
	ns due to existence of the ``instantaneous'' causal structure\, with one of
	 the light cone variables being a global time. In two dimensions this causa
	l structure is invariant under the Poincare group if one gives up the spati
	al parity. As a non-trivial example of a consistent interacting quantum fie
	ld theory with this causal structure we discuss a non-linear SO(1\,1) sigma
	-model\, where SO(1\,1) is the Lorentz symmetry. We show that this theory i
	s asymptotically free and argue that this model is also well defined non-pe
	rturbatively\, at least for some values of parameters. It provides an examp
	le of a microscopic Poincare invariant quantum field theory with local acti
	on\, but non-local physical properties. Being coupled to gravity this ``ins
	tantaneous'' theory mixes with the Liouville field. If proves to be consist
	ent\, the resulting model can be used to construct (non-critical) string th
	eories with very unconventional properties by introducing the instantaneous
	 causal structure on the world-sheet."
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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