Status  Confirmed 
Seminar Series  RENCTHEO 
Subjects  hepth 
Date  Thursday 15 November 2018 
Time  11:40 
Institute  IHP 
Seminar Room  201 
Speaker's Last Name  Weigand 
Speaker's First Name  Timo 
Speaker's Email Address  
Speaker's Institution  CERN 
Title  A Stringy Test of the Weak Gravity Conjecture 
Abstract  Various swampland conjectures have been put forward in the recent literature to characterize general properties of an effective field theory which can be consistently coupled to quantum gravity. String theory as a framework for quantum gravity allows us to put these conjectures to a quantitative test. Among the earliest of these conjectures is the Weak Gravity Conjecture: It postulates the existence of a set of particles in any quantum gauge theory coupled to gravity whose chargetomass ratio must exceed that of an extremal black hole. In this talk we will verify this and further swampland conjectures in string theory, focussing for simplicity on string compactifications to six dimensions with 8 supercharges, in the vicinity of the weak coupling point of the gauge theory. Our proof of the Weak Gravity Conjecture near the weak coupling point combines various aspects of the Kahler geometry of complex surfaces, arithmetic properties of weak Jacobi forms and BPS invariants on CalabiYau threefolds. Along the way we elucidate the modification of the Weak Gravity Conjecture due to massless scalar fields. We find perfect agreement between the predictions of the modified conjecture and the chargetomass ratio of a set of physical stringy nonBPS states in the theory. Their charges span a sublattice of the full charge lattice, whose index we determine geometrically. 
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