Quantum Gravity Gatherings
2 events

Seminar
Volume complexity of de Sitter bubbles
November 22 (Wed) at 16:00  17:30, 2023
Nicolò Zenoni (Postdoctoral Researcher, Department of Physics, Osaka University)
Holographic complexity is conjectured to probe the evolution of spacetime. For black holes in antide Sitter (AdS) spacetime the growth rate of complexity approaches a constant value at late times, while in de Sitter (dS) spacetime it diverges at a finite critical time. In this talk, we consider geometries interpolating between AdS and dS. In particular, we discuss the evolution of volume complexity in a class of threedimensional asymptotically antide Sitter geometries including dynamical bubbles of de Sitter in their interior. According to the dynamics of the bubble, complexity qualitatively behaves either as in the AdS black hole or as in the dS case. We conclude with some remarks about the possible dual interpretation.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English

Seminar
Quasilocal holography in 3d quantum gravity
August 4 (Fri) at 14:00  15:30, 2023
Etera Livine (Research Director CNRS, Ecole Normale Supérieure de Lyon, France)
Since the idea appeared in black hole physics, the concept of holography has become a guiding principle for quantum gravity. It is the notion that the dynamics of the geometry of a region of spacetime can be entirely encoded in a theory living on its boundary. Although such holographic dualities have been welldeveloped in an asymptotical context, it remains a challenge to realize it exactly at finite distances. I will draw a possible route in 3d quantum gravity, by showing a duality between the PonzanoRegge path integral for 3d quantum gravity as a topological field theory and the 2d (inhomogeneous) Ising model. This leads to an intriguing geometrical interpretation of the Ising critical couplings and opens the door to a possibly rich interplay between 3d quantum gravity and 2d condensed matter built out of holographic dualities.
Venue: Seminar Room #359 (Main Venue) / via Zoom
Event Official Language: English
2 events