Affordable Access

Publisher Website

The Hawking energy in a perturbed Friedmann-Lemaître universe

Authors
  • Stock, Dennis
  • Di Dio, Enea
  • Durrer, Ruth
Type
Published Article
Journal
Journal of Cosmology and Astroparticle Physics
Publisher
IOP Publishing
Publication Date
Aug 01, 2023
Volume
2023
Issue
08
Identifiers
DOI: 10.1088/1475-7516/2023/08/033
Source
ioppublishing
Keywords
Disciplines
  • paper
License
Unknown

Abstract

Hawking's quasi-local energy definition quantifies the energy enclosed by a spacelike 2-sphere in terms of the amount of lightbending on the sphere caused by the energy distribution inside the sphere. This paper establishes for the first time a direct connection between the formal mathematical definition of a quasi-local energy and observations, in the context of cosmological perturbation theory. This is achieved by studying the Hawking Energy of spherical sections of the past lightcone of a cosmic observer in a perturbed Friedmann-Lemaître spacetime. We express the Hawking Energy in terms of gauge-invariant perturbation variables and comment on the cosmic observables needed to in principle measure it. We then calculate its angular power spectrum and interpret its contributions.

Report this publication

Statistics

Seen <100 times