Statut  Confirmé 
Série  SEMLPT 
Domaines  hepph 
Date  Jeudi 12 Octobre 2017 
Heure  14:00 
Institut  LPT 
Salle  Salle 114, batiment 210, 1er etage 
Nom de l'orateur  Witkowski 
Prenom de l'orateur  Lukas 
Addresse email de l'orateur  
Institution de l'orateur  APC Paris 
Titre  SuperPlanckian scalars ? 
Résumé  Scalar fields with superPlanckian field ranges play an important role in models of largefield inflation and are also employed in cosmological solutions to the electroweak hierarchy problem. One difficulty in constructing such models is that for superPlanckian field values quantumgravitational effects cannot be ignored. In particular, ultraviolet physics is expected to constrain the field range over which scalars can exhibit a monotonic potential, which in turn has consequences for models of inflation. To study theories of superPlanckian scalars some knowledge of ultraviolet physics is thus necessary. String Theory is a candidate theory of Quantum Gravity and a suitable framework for addressing this question. Another approach is based on the Weak Gravity Conjecture  an as yet unproven theorem regarding consistent theories of Quantum Gravity. In this talk I want to report on recent progress in the study of superPlanckian scalars. In particular, I will explain how the existence of superPlanckian scalars is increasingly called into question by both String Theory and the Weak Gravity Conjecture. 
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