Topic: quantum gravity

This Perimeter Institute conference brings together researchers studying quantum reference frames, quantum gravity, quantum foundations and related experiments. Topics include relational observables, quantum information in dynamical spacetime, locality, causality, entanglement, and the operational meaning of observers and subsystems. The meeting runs from 26 to 30 October 2026 in Waterloo, Canada. The organizer provides information for virtual participation.

Bring together amplitude-bootstrap approaches to string theory in flat and curved backgrounds. Researchers will discuss how bootstrap constraints reveal the structure of string amplitudes and how these methods extend to cosmological observables and anti-de Sitter or de Sitter settings. The workshop connects communities studying the S-matrix, cosmological correlators and quantum gravity through presentations and scientific discussion. 30 November 2026 at 09:00 through 4 December at 17:00, Asia/Taipei (UTC+8). Public participant registration closes on 20 November 2026.

Luca Mrini presents work in progress on quantising singular configuration spaces using the non-smooth calculus of metric-measure spaces. The framework generalises smooth quantum mechanics through Hilbert spaces, position and momentum operators, Hamiltonians, unitary dynamics, and observable algebras. A method for bounding mass gaps after symplectic reduction uses the curvature of the unreduced configuration space. Examples include the harmonic oscillator constrained to zero angular momentum, lattice Yang–Mills theory, and fractional-dimensional Laakso spaces. The talk closes with prospective

Vijay Balasubramanian connects quantum chaos with the complexity of time evolution. One approach bounds the smallest circuit needed to simulate physical dynamics; another measures how quickly and ergodically a state explores its accessible Hilbert space. Examples from spin chains, billiards, many-body systems and random matrices distinguish chaotic and integrable behaviour. Applications address geometric conjectures for complexity in quantum gravity and possible failure of effective field theory near spacelike singularities.