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SUMMARY:Jakob Moritz (CERN)
DTSTART:20241127T150000Z
DTEND:20241127T160000Z
DTSTAMP:20260423T052332Z
UID:AnLy/48
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/AnLy/48/">De
  Sitter candidates in string theory</a>\nby Jakob Moritz (CERN) as part of
  AnLy Strings and Fields online seminars\n\n\nAbstract\nThe simplest cosmo
 logy compatible with the accelerated expansion of our universe is de Sitte
 r space. Yet\, more than 25 years after the discovery of ``dark energy’
 ’\, concrete de Sitter vacua of string theory have remained elusive. In 
 this talk I will present the first fully concrete string compactifications
  that yield\, at leading order in the string loop and $\\alpha’$ expansi
 ons\, de Sitter vacua of a form envisioned by Kachru\, Kallosh\, Linde and
  Trivedi (KKLT) more than 20 years ago. I will begin by reviewing the KKLT
  proposal and its complex set of delicately balanced ingredients. Then\, I
  will show how all the required features come together in actual examples:
  I will define explicit Calabi-Yau orientifolds and choices of quantized f
 luxes\, and derive the corresponding four-dimensional effective supergravi
 ty theories. Each example includes a strongly warped ``Klebanov-Strassler 
 throat'' region containing a single anti-D3-brane\, whose supersymmetry-br
 eaking energy\, computed at leading order in $\\alpha'$\, causes an uplift
  to a metastable de Sitter vacuum in which all moduli are stabilized. I wi
 ll conclude by emphasizing a set of outstanding computational problems tha
 t need to be overcome in order to determine whether these vacua survive (p
 resently unknown) subleading corrections\, and thus promote to full soluti
 ons of string theory.\n
LOCATION:https://researchseminars.org/talk/AnLy/48/
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