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SUMMARY:"Thermal derivation of the Coleman-de Luccia tunnelling prescripti
 on" - Adam Brown (Columbia)
DTSTART:20070927T150000Z
DTEND:20070927T160000Z
UID:TALK8297@talks.cam.ac.uk
CONTACT:Joseph Conlon
DESCRIPTION:We derive the rate for transitions between de Sitter vacua by 
 treating the field theory on the static patch as a thermal system. This re
 produces the Coleman-De Luccia formalism for calculating the rate\, but le
 ads to a modified interpretation of the bounce solution and a different pr
 ediction for the evolution of the system after tunneling. The bounce is se
 en to correspond to a sequence of configurations interpolating between ini
 tial and final configurations on either side of the tunneling barrier\, al
 l of which are restricted to the static patch. The final configuration\, w
 hich gives the initial data on the static patch for evolution after tunnel
 ing\, is obtained from one half of a slice through the center of the bounc
 e\, while the other half gives the configuration before tunneling. The for
 malism makes no statement about the fields beyond the horizon. This approa
 ch resolves several puzzling aspects and interpretational issues\nconcerni
 ng the Coleman-De Luccia and Hawking-Moss bounces. We work in the limit wh
 ere the back reaction of matter on metric can be ignored\, but argue that 
 the qualitative aspects remain in the more general case. The extension to 
 tunneling between anti-de Sitter vacua is discussed.\n\n
LOCATION:MR9\, Centre for Mathematical Sciences
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