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SUMMARY:Cosmological Constant as a Manifestation of the Hierarchy - Pisin 
 Chen (LeCosPA\, Taiwan and KIPAC\, Stanford)
DTSTART:20091021T121500Z
DTEND:20091021T124500Z
UID:TALK21005@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:We suggest that the cosmological constant as implied by the da
 rk energy be related to the well-known hierarchy between the Planck scale 
 (10^19GeV) and the Standard Model scale (TeV). It is posited that the same
  brane-world setup to address this hierarchy problem may also address the 
 smallness problem of the cosmological constant. Specifically\, the various
  physical energy scales in the system\, including the cosmological constan
 t\, are supposedly associated with the Planck mass through different power
 s of the 'gravity fine structure constant'\, alpha_G=M_SM/M_Pl. We provide
  a model based on the Randall-Sundrum geometry where SUSY-breaking is indu
 ced by the coupling between a Higgs field and the gravitino on the TeV bra
 ne. We show that the Casimir energy density of the system indeed conforms 
 with the observed dark energy scale.
LOCATION:Sackler Lecture Theatre\, IoA
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