Statut  Confirmé 
Série  APCTH 
Domaines  hepth 
Date  Mardi 2 Octobre 2018 
Heure  14:00 
Institut  APC 
Salle  412 B  Rothko 
Nom de l'orateur  Dudas 
Prenom de l'orateur  Emilian 
Addresse email de l'orateur  
Institution de l'orateur  CPHT  Ecole Polytechnique 
Titre  Hidden symmetries and Goldstone bosons from higher dimensions? 
Résumé  Free massless scalars have a shift symmetry. This is usually broken by interactions, such that quantum corrections induce a quadratically divergent mass term. In the Standard Model this leads to the hierarchy problem, the question why the Higgs mass is so much smaller than the Planck mass. We present an example where a large scalar mass term is avoided by coupling the scalar to an infinite tower of massive states, obtained from a sixdimensional theory compactified on a torus with magnetic flux. We show that the shift symmetry of the scalar is preserved in the effective fourdimensional theory despite the presence of gauge and Yukawa interaction terms. 
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