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SUMMARY:The cosmological constant problem (and its sequester) - Tony Padil
 la (Nottingham)
DTSTART:20140604T131500Z
DTEND:20140604T141500Z
UID:TALK52194@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:I will review the notorious cosmological constant problem\, so
 metimes described as the worst fine tuning problem in Physics. I will expl
 ain the true nature of the problem\, which is one of radiative instability
  against any change in the effective description. I will recall Weinberg
 ’s venerable no-go theorem that prohibits certain attempts to “solve
 ” this problem before going on to explain a new mechanism that circumven
 ts Weinberg. This is the vacuum energy sequester\, a global modification o
 f GR that results in the cancellation of large vacuum energy contributions
  from a protected matter sector (taken to include the Standard Model) at e
 ach and every order in the perturbative loop expansion. Cosmological conse
 quences are a Universe which has finite space-time volume\, will ultimatel
 y crunch\, and for which dark energy can only be a transient.
LOCATION:MR2\, Centre for Mathematical Sciences
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