Unruh Radiation, Holography and Boundary Cosmology

TL;DR

This paper explores how accelerated observers in anti-de Sitter space detect thermal radiation and how this phenomenon can be understood through holography, revealing connections to cosmological spacetimes like Milne and deSitter universes.

Contribution

It provides a holographic interpretation of Unruh radiation in AdS, linking acceleration-induced thermality to boundary cosmologies and observer classes.

Findings

Holographic blobs expand along the boundary for accelerated trajectories.

Supercritical acceleration leads to Milne universe holograms.

Thermality is linked to specific observer classes in boundary cosmologies.

Abstract

A uniformly acclerated observer in anti-deSitter space-time is known to detect thermal radiation when the acceleration exceeds a critical value. We investigate the holographic interpretation of this phenomenon. For uniformly accelerated trajectories transverse to the boundary of the AdS space, the hologram is a blob which expands along the boundary. Observers on the boundary co-moving with the hologram become observers in cosmological space-times. For supercritical accelerations one gets a Milne universe when the holographic screen is the boundary in Poincare coordinates, while for the boundary in hyperspherical coordinates one gets deSitter spacetimes. The presence or absence of thermality is then interpreted in terms of specific classes of observers in these cosmologies.