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Lightcone modular bootstrap and pure gravity

October 7, 2019 - 2:00pm to 4:00pm
Varian Physics - Room 355


Nathan Benjamin of Princeton University will give the Stanford Institute for Theoretical Physics (SITP) Monday Colloquium.


I will discuss the large spin spectrum of two-dimensional conformal field theories by looking at the modular bootstrap in the lightcone limit. In the presence of a twist gap amongst the Virasoro primary operators (where twist is the difference between conformal dimension and spin), there is a universal expression for the density of states that extends beyond the usual Cardy regime. This expression has an interesting feature which suggests a new upper bound on the lowest twist primary operator present in any 2d CFT. For theories holographically dual to large-radius gravity in AdS$_3$, this new bound is below the BTZ threshold, which in particular would imply that pure AdS$_3$ gravity does not exist.

Event Sponsor: 
the Stanford Institute for Theoretical Physics
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