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SUMMARY:Surprising Dark Implications of a Supersymmetric Gravity Sector - 
 Cliff Burgess - McMaster U. &amp\; Perimeter Institute
DTSTART:20220606T120000Z
DTEND:20220606T130000Z
UID:TALK175316@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:This talk explores surprises that emerge as consequences of ac
 cidental approximate scale invariances combined with a relatively supersym
 metric gravity sector\, both of which are argued to be robust consequences
  of UV physics (like string theory). Taken together these can be more than
  the sum of their parts\, and suggest the low-energy world around us shoul
 d consist of non-supersymmetric particle physics coupled to a rich dark se
 ctor built from supersymmetric gravity. A core prediction is that all part
 icle masses arise proportional to the vev\, v\, of a dilaton field with th
 e pattern where Standard Model masses\, M\, neutrino masses\, m\, and the 
 Planck mass satisfy Mp/M \\sim M/m \\sim v\, suggesting v is order 1e15. T
 he framework also predicts the scalar potential for v\, and this has both 
 AdS and dS solutions without any need for problematic uplifting. The poten
 tial arises as a function of log v and so can give exponentially large val
 ues for v using only input parameters of order 70. Tantalizingly\, at its 
 minimum the potential evaluates to the fourth power of an energy E = (weak
  scale squared)/(Planck mass) that scales with v in the same way as a famo
 us phenomenologically successful numerology. The prefactor is somewhat mod
 el-dependent\, but in the known examples predicts the potential at its min
 imum to be suppressed by two powers of v (and five powers of log v)\, rela
 tive to the supersymmetry breaking scale in particle physics. For supersym
 metry broken at 100 TeV this predicts a dark energy density of 1e(-91) in 
 Planck units: not yet nailing the Dark Energy density -- 1e(-120) -- but a
 t least taping it down better than usual. Preliminary phenomenological imp
 lications are drawn assuming this framework eventually succeeds in further
  pushing down the minimum of V\, and include intriguing cosmologies that (
 for free) seem to dynamically implement a recent proposal for resolving th
 e Hubble tension (by modifying the electron mass around recombination).
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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