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SUMMARY:On Renormalization Group Flows in Four Dimensions - Zohar Komargod
 ski (IAS & Weizmann Institute of Science)
DTSTART:20111013T120000Z
DTEND:20111013T130000Z
UID:TALK33480@talks.cam.ac.uk
CONTACT:Sungjay Lee
DESCRIPTION:We discuss some general aspects of renormalization group flows
 \nin four dimensions. Every such flow can be reinterpreted in terms of a s
 pontaneously broken conformal symmetry. We analyze in detail the consequen
 ces of trace anomalies for the effective action of the Nambu-Goldstone bos
 on of broken conformal symmetry. While the c-anomaly is algebraically triv
 ial\, the a-anomaly is "non-Abelian\," and leads to a positive-definite un
 iversal contribution to the S-matrix of 2->2 dilaton scattering. Unitarity
  of the S-matrix results in a monotonically\ndecreasing function that inte
 rpolates between the Euler anomalies in the ultraviolet and the infrared\,
  thereby establishing the a-theorem.
LOCATION:Potter Room (first floor\, Pav. B)
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