Status  Confirmed 
Seminar Series  IPHTMAT 
Subjects  hepth 
Date  Wednesday 4 September 2019 
Time  14:15 
Institute  IPHT 
Seminar Room  Salle Claude Itzykson, Bât. 774 
Speaker's Last Name  Stefano Andriolo 
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Speaker's Institution  Hong Kong University of Science and Technology 
Title  A Tower Weak Gravity Conjecture from Infrared Consistency 
Abstract  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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