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SUMMARY:Kevin Costello (Perimeter Institute)
DTSTART:20200427T190000Z
DTEND:20200427T200000Z
DTSTAMP:20260423T052645Z
UID:WHCGP/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/WHCGP/2/">To
 pological strings\, twistors\, and Skyrmions</a>\nby Kevin Costello (Perim
 eter Institute) as part of Western Hemisphere colloquium on geometry and p
 hysics\n\n\nAbstract\nIt has long been known that holomorphic field theori
 es on twistor space lead to "physical" field theories on Minkowski space. 
 In this talk I will discuss a type I (unoriented) version of the topologic
 al B model on twistor space. The corresponding theory on Minkowski space i
 s a sigma-model with target the group SO(8). This is a variant of the Skyr
 me model that appears as the low-energy effective theory of mesons in QCD.
  (The group SO(8) appears because of the Green-Schwarz mechanism in the to
 pological string). The origin of this model in the topological string impl
 ies many remarkable properties. For one thing\, the model is\, in a certai
 n sense\, integrable. Further\, although the Lagrangian is power-counting 
 non-renormalizable\, counter-terms at all loops can be uniquely fixed.\n
LOCATION:https://researchseminars.org/talk/WHCGP/2/
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