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BEGIN:VEVENT
DTSTAMP:20260919T145851Z
LAST-MODIFIED:20151112T193026Z
DTSTART:20151118T203000Z
DTEND:20151118T213000Z
UID:event1483@bu.edu
URL:http://physics.bu.edu/internal/events/show/1483
SUMMARY:Causality Constraints in Conformal Field Theory
DESCRIPTION:Featuring Tom Hartman \, Cornell\n\nPart of the HET Seminar Ser
	ies.\n\nIt is well known that some effective field theories cannot be UV co
	mpleted -- perturbative amplitudes in the infrared may be at odds with ultr
	aviolet consistency conditions\, like the optical theorem.  In this talk I 
	will describe an analogue of these constraints in strongly coupled conforma
	l field theory.  Correlation functions (in position space) obey a sum rule 
	that constrains the couplings among low-dimension operators.   If the const
	raints are violated\, then the low-dimension sector cannot be embedded into
	 a full causal CFT.  In large-N holographic theories\, this strong-coupling
	 constraint matches known weak-coupling constraints in the bulk effective f
	ield theory.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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