Quantum Fluctuations and Newton-Cartan Geometry for Non-Relativistic de Sitter space

TL;DR

This paper explores non-relativistic de Sitter gravity in two dimensions, analyzing boundary quantum fluctuations and constructing a Newton-Cartan bulk geometry to extend holographic duality.

Contribution

It introduces a non-relativistic realization of de Sitter gravity, deriving the boundary path integral measure and constructing a compatible Newton-Cartan bulk geometry.

Findings

One-loop partition function scales as T^2, matching symmetry generator count.

Derived the path integral measure directly using Ostrogradsky formalism.

Constructed a Newton-Cartan geometry satisfying non-relativistic JT-like equations.

Abstract

We study a non-relativistic realisation of two-dimensional de Sitter gravity both from its boundary and bulk description with the goal of learning about de Sitter space and paving the way for extending the holographic duality into a non-relativistic direction. On the boundary side, we analyse the Schwarzian-type boundary action associated with non-relativistic de Sitter gravity and evaluate its one-loop partition function in order to compute its quantum fluctuations. Rather than relying on the coadjoint-orbit construction, we derive the path integral measure directly from the action using the Ostrogradsky formalism. We find a temperature-dependent prefactor scaling as $T^2$, of which the power agrees with the counting of the four global symmetry generators present. On the bulk side, we construct the corresponding torsionless Newton-Cartan geometry and show that it satisfies the equations of motion of a non-relativistic JT-like action and uplift the geometry to a three-dimensional Lorentzian geometry.