Bounds on Species Scale and the Distance Conjecture

par Max Wiesner (Harvard University)

mercredi 3 mai 2023, 16:00 → 17:00 Europe/Paris

Online seminar

 

Abstract: 

The species scale serves as a UV cutoff in the gravitational sector of an EFT and can depend on the moduli of the theory as the spectrum of the theory varies. We argue that the slope of the species scale as a function of massless (or light) modes is bounded by an O(1) coefficient.  This bound is true at all points in moduli space including also its interior.  The argument is based on the idea that the short distance contribution of massless modes to gravitational terms in the EFT cannot dramatically affect the black hole entropy.  Based on string theory arguments we expect the O(1)  constant in this bound to be equal to 1/d-2 as we approach the boundary of the moduli space. However, we find that the slope of the species scale can approach its asymptotic value from above as we go from interior points to the boundaries, thereby implying that the constant in the bound must be larger than 1/d-2. The bound on the variation of the species scale also implies that the mass of towers of light modes cannot go to zero faster than exponential in field distance in accordance with the Distance Conjecture. 

Link: Zoom

AnLy: https://sites.google.com/view/anlystringsandfields