For best experience please turn on javascript and use a modern browser!

Speakers Tomonori Ugajin (KITP Santa Barbara) and Miguel Montero (Utrecht). Note the unusual location: Paviljoenzaal, Museum Volkenkunde, Leiden

Event details of Holography: triangle meeting
Date 23 February 2018
Time 13:30 -18:00


13:30 Tea & Coffee

14:00 Tomonori Ugajin (KITP Santa Barbara)

Relative entropy in CFT

15:15 Coffee break

15:45 Miguel Montero (Utrecht) 

Lloyd’s bound and the WGC

17:00 Borrel


Tomonori Ugajin (KITP) 

Relative entropy in CFT 

Abstract: Relative entropy is a quantum information theoretic measure of distance between two density matrices.   In this talk, I will explain our recent studies in which we developed ways to calculate relative entropy in CFT, and the applications of the results, in particular, to  bulk physics (1705.01486) and physics of scrambling (to appear soon).  

Miguel Montero (Utrecht) 

Lloyd’s bound and the WGC 

Abstract: The Weak Gravity Conjecture (WGC) is a proposed constraint on EFT’s that can be consistently coupled to quantum gravity, but which remains unproven so far. On the other hand, Lloyd’s bound constraints the maximum speed of a classical computer. I will discuss a connection between the WGC in AdS spacetimes and Lloyd’s bound in the C=A proposal for computing holographic complexity: The latter implies the former, so we are led to explore the assumptions behind Lloyd’s bound, and to what extent they are valid in holographic complexity. We will find that for a wide class of backgrounds the assumptions are not satisfied, meaning that these backgrounds do not behave as classical computers; I will discuss the implications for the WGC.


Paviljoenzaal, Museum Volkenkunde, Steenstraat 1, Leiden



This event is part of a regular series of meetings sponsored by Delta ITP with the objective of bringing together the theoretical physics communities in Amsterdam, Leiden, Utrecht and our sister nodes Groningen, Brussels (ULB and VUB) and Leuven. The topic of this meeting is holography and its applications to different physical systems. We encourage researchers from different areas in theoretical physics to participate!