Statut  Confirmé 
Série  IPHTMAT 
Domaines  hepth 
Date  Mercredi 4 Septembre 2019 
Heure  14:15 
Institut  IPHT 
Salle  Salle Claude Itzykson, Bât. 774 
Nom de l'orateur  Stefano Andriolo 
Prenom de l'orateur  
Addresse email de l'orateur  
Institution de l'orateur  Hong Kong University of Science and Technology 
Titre  A Tower Weak Gravity Conjecture from Infrared Consistency 
Résumé  We analyze infrared consistency conditions of 3D and 4D effective field theories with massive scalars or fermions charged under multiple $U(1)$ gauge fields. At low energies, one can integrate out the massive particles and thus obtain a oneloop effective action for the gauge fields. In the regime where chargeindependent contributions to higherderivative terms in the action are sufficiently small, it is then possible to derive constraints on the chargetomass ratios of the massive particles from requiring that photons propagate causally and have an analytic Smatrix. We thus find that the theories need to contain bifundamentals and satisfy a version of the weak gravity conjecture known as the convexhull condition. Demanding selfconsistency of the constraints under KaluzaKlein compactification, we furthermore show that, for scalars, they imply a stronger version of the weak gravity conjecture in which the chargetomass ratios of an infinite tower of particles are bounded from below. We find that the tower must again include bifundamentals but does not necessarily have to occupy a charge (sub)lattice. 
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