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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260814T220931Z
LAST-MODIFIED:20170125T192906Z
DTSTART:20170201T210000Z
DTEND:20170201T220000Z
UID:event1706@bu.edu
URL:http://physics.bu.edu/internal/events/show/1706
SUMMARY:Loops in AdS from conformal symmetry
DESCRIPTION:Featuring Agnese Bissi\, Harvard\n\nPart of the HET Seminar Ser
	ies.\n\nIn this talk I will discuss a new use for conformal field theory cr
	ossing equation in the context of AdS/CFT:  the computation of loop amplitu
	des in AdS\, dual to non-planar correlators in holographic CFTs. I will rev
	isit this problem and the dual 1/N expansion of CFTs\, in two independent w
	ays. The first is to show how to explicitly solve the crossing equations to
	 the first subleading order in 1/N^2\, given a leading order solution. This
	 is done as a systematic expansion in inverse powers of the spin\, to all o
	rders. These expansions can be resummed\, leading to the CFT data for finit
	e values of the spin. The second approach involves Mellin space. As an exam
	ple\, I’ll show how the polar part of the four-point\, loop-level Mellin 
	amplitudes can be fully reconstructed from the leading-order data. The anom
	alous dimensions computed with both methods agree. In the case of \phi^4 th
	eory in AdS\, the crossing solution reproduces a previous computation of th
	e one-loop bubble diagram. I will end with a discussion on open problems an
	d new developments.
LOCATION:PRB 565\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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