119 citations · 612 across the 23 of their papers we have counts for
25 papers
The cosmological necklace problem
Andreas Blommaert, Jonah Kudler-Flam, Vladimir Narovlansky +1
We investigate 3d de Sitter axion wormhole which contribute to the no-boundary density matrix. We identify "cosmological necklace" solutions: an infinite series of Euclidean saddle…
An observer's quantization of 3d de Sitter
Andreas Blommaert, Damiano Tietto, Herman Verlinde
What is the density of states of the de Sitter static patch? We propose a definition and calculation of such a density in 3d dS. Our proposal involves a sum over an SL(2,$\mathbb{Z…
Time in gravitational subregions and in closed universes
Andreas Blommaert, Chang-Han Chen
What are gauge-invariant local observables in a subregion in quantum gravity? How does one even define such a subregion non-perturbatively? We study these questions in JT gravity.…
SYK collective field theory as complex Liouville gravity
Andreas Blommaert, Damiano Tietto, Herman Verlinde
We establish a precise relationship between the collective field theory of the double scaled SYK model and the worldsheet theory of the complex Liouville string a.k.a. sine di…
Sphere amplitudes and observing the universe's size
Andreas Blommaert, Adam Levine
Sine dilaton gravity is holographically related to DSSYK. We explain how to interpret sine dilaton as 2d quantum cosmology. This paves the way for using two copies of DSSYK as holo…
Wormholes, branes and finite matrices in sine dilaton gravity
Andreas Blommaert, Adam Levine, Thomas G. Mertens +2
We compute the double trumpet in sine dilaton gravity via WdW quantization. The wormhole size is discretized. The wormhole amplitude matches the spectral correlation of a finite-cu…