Heidelberg 2022 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 6: Cosmology

GR 6.3: Vortrag

Dienstag, 22. März 2022, 16:55–17:15, GR-H3

The Hawking energy of a cosmic observer in linearly perturbed FLRW — •Dennis Stock and Ruth Durrer — Université de Genève, Département de Physique Théorique and Center for Astroparticle Physics, 24 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland

Addressing cosmological questions exclusively based on observations requires a formulation on the past lightcone of the cosmic observer. In this talk, the question of how to define gravitational energy associated with the past lightcone of a cosmic observer is studied by introducing Hawking's quasi-local energy as a tentative energy measure of the observable Universe. The Hawking energy phenomenologically quantifies energy in terms of light bending. This talk will mainly focus on the relation of the Hawking energy to cosmological observables within linear perturbation theory on an FLRW background.