University of Cambridge > Talks.cam > Wednesday HEP-GR Colloquium > A Weak Gravity Theorem

A Weak Gravity Theorem

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Francesca Day.

In a gravitational theory with a massless photon the maximum charge-to-mass ratio of black holes approaches the prediction of the Einstein-Maxwell theory as black hole mass increases: Q_ext/M = 1 + a/ M^2 for some constant a. I will show that a>0 if below the quantum gravity scale (\Lambda) there are many degrees of freedom with a hierarchically small mass gap, log(\Lambda/m)>>1. In this regime one can derive field-theoretic sum-rules for the coefficients of the leading corrections to the Einstein-Maxwell theory that imply a>0. Hence gravitational force among maximally charged black holes keeps getting weaker with respect to the electric force as the black hole size becomes smaller.

This talk is part of the Wednesday HEP-GR Colloquium series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2019 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity