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SUMMARY:Irene Valenzuela (Harvard)
DTSTART:20210610T143000Z
DTEND:20210610T153000Z
DTSTAMP:20260423T010102Z
UID:HEPTUW/25
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/HEPTUW/25/">
 Light Fermions and the Swampland</a>\nby Irene Valenzuela (Harvard) as par
 t of HEP seminars TU Wien (Vienna)\n\n\nAbstract\nQuantum gravity can have
  important implications for Particle Physics and Cosmology. We consider co
 nstraints on D-dimensional theories in Minkowski\, dS and AdS backgrounds 
 in the light of AdS swampland conjectures as applied to their compacticati
 on in a circle. In particular\, we consider the non-SUSY AdS instability c
 onjecture and the AdS distance conjecture. For Minkowski and dS vacua the 
 results may be summarized by a light fermion conjecture which states that 
 in theories with a positive first non-vanishing supertrace $(-1)^{k+1}Str(
 M^{2k}) > 0$\, a surplus of light fermions with mass $m_f < \\Lambda_D^{1/
 D}$ must be present\, where $\\Lambda_D$ is the cosmological constant. The
  case of AdS can be made consistent with the mild but not the strong versi
 on of the AdS Distance conjecture. I will also apply the above constraints
  to the Standard Model of particle physics\, obtaining that it would be in
 consistent in Minkowski space but consistent in dS if the lightest neutrin
 o is Dirac and lighter than the cosmological constant scale. This may shed
  some light into the naturalness issues observed in our universe.\n
LOCATION:https://researchseminars.org/talk/HEPTUW/25/
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