Statut  Confirmé 
Série  RENCTHEO 
Domaines  hepth 
Date  Jeudi 3 Octobre 2024 
Heure  10:00 
Institut  IHP 
Salle  Salle Yvette Cauchois (batiment Perrin) 
Nom de l'orateur  Moritz 
Prenom de l'orateur  Jakob 
Addresse email de l'orateur  
Institution de l'orateur  CERN 
Titre  De Sitter candidates in String Theory 
Résumé  The simplest cosmology compatible with the accelerated expansion of our universe is de Sitter 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 $\alpha’$ expansions, 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 CalabiYau orientifolds and choices of quantized fluxes, and derive the corresponding fourdimensional effective supergravity theories. Each example includes a strongly warped ``KlebanovStrassler throat'' region containing a single antiD3brane, whose supersymmetrybreaking energy, computed at leading order in $\alpha'$, causes an uplift to a metastable de Sitter vacuum in which all moduli are stabilized. I will conclude by emphasizing a set of outstanding computational problems that need to be overcome in order to determine whether these vacua survive (presently unknown) subleading corrections, and thus promote to full solutions of string theory. 
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