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SUMMARY:Cosmological constant in SUGRA models inspired by degenerate vacua
  - Dr Roman Nevzorov (Glasgow)
DTSTART:20081114T160000Z
DTEND:20081114T170000Z
UID:TALK13264@talks.cam.ac.uk
CONTACT:Are Raklev
DESCRIPTION:It is well known that global symmetries can protect a zero val
 ue for the cosmological constant in N=1 supergravity (SUGRA). The best mot
 ivated scenario of this type is no--scale supergravity where global symmet
 ries guarantee not only vanishing of the vacuum energy density but also pr
 eserve local supersymmetry (SUSY) in all vacua. The breakdown of these sym
 metries that ensures the vanishing of the vacuum energy density near the p
 hysical vacuum leads to the natural realisation of the multiple point prin
 ciple (MPP) assumption\, i.e. results in the set of degenerate\nvacua with
  broken and unbroken local supersymmetry. We present the minimal SUGRA mod
 el where the MPP assumption is realised without any extra fine-tuning. The
  cosmological constant in the MPP inspired SUGRA models\nis naturally tiny
  $\\rho_{\\Lambda} << 10^{-100} M_{Pl}4$. 
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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