High Energy Physics Seminar

Rosanna Sain rosanna at ictp.it
Mon Oct 12 13:03:32 CEST 2020


THURSDAY, 15 OCTOBER 2020, 14:30 p.m.

(University of Amsterdam)

"Towards a microscopic model of AdS fragmentation"

Abstract:A salient feature of black holes near extremality is the 
appearance of an AdS$_2$ throat in their near-horizon geometry. 
Depending on the underlying theory, these AdS$_2$ throats may be 
unstable to fragmentation, wherein a single throat is instead replaced 
by a tree-like structure of branched AdS$_2$ throats. For 
Einstein-Maxwell theory, the underlying reason behind this instability 
is the existence of multi-centered configuration in the moduli space of 
black hole solutions at fixed total charge. Given the success of the 
Schwarzian/SYK paradigm for understanding a single AdS$_2$ it is time to 
revisit the fragmentation story. To build up intuition, I will present a 
model, studied in the statistical mechanics literature, that shares many 
features with SYK, including exact solvability at large-N and an 
emergent conformal symmetry that gets weakly broken in the UV. The novel 
feature of this model is the appearance of a spin glass phase at O(1) 
temperatures, which I will try to relate to the fragmentation story.

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