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SUMMARY:The Cosmological Constant and Dark Energy from Non-Supersymmetric 
 String Theory - Susha Parameswaran (University of Liverpool)
DTSTART:20260217T110000Z
DTEND:20260217T120000Z
UID:TALK241891@talks.cam.ac.uk
CONTACT:Dr Paul Swallow
DESCRIPTION:\nWhy doesn’t the vacuum energy implied by quantum field the
 ory—through the known Standard Model fields and their radiative correcti
 ons—curve spacetime catastrophically\, driving either an exponentially r
 apid expansion or collapse?  Supersymmetry is known to ameliorate this lon
 g-standing Cosmological Constant Problem\, but only down to the scale set 
 by the susy-breaking mass splittings\; at least ~TeV for the visible secto
 r.  String theory offers new possibilities.  I will present an explicit no
 n-supersymmetric string construction in which the open-string (particle ph
 ysics) contributions to the one-loop vacuum energy exactly cancel between 
 a visible brane sector and a symmetry-enforced hidden mirror sector\, whil
 st the remaining closed-string (gravitational) contributions are suppresse
 d in the size of one or two large extra dimensions (a.k.a. "dark dimension
 s") and can naturally lie near the observed Dark Energy scale.  I'll concl
 ude by discussing the key observational challenges and opportunities of th
 e scenario.
LOCATION:Ray Dolby Center -- Seminar Room: D2.002 
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