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GR: Fachverband Gravitation und Relativitätstheorie
GR 10: Quantum Gravity and Quantum Cosmology 1
GR 10.7: Vortrag
Mittwoch, 1. April 2020, 18:00–18:15, H-HS IX
Primordial black holes in a dimensionally reduced universe — •Athanasios Tzikas1, Piero Nicolini2, Jonas Mureika3, and Bernard Carr4 — 1Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany — 2Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany — 3Loyola Marymount University, Los Angeles, USA — 4Queen Mary University of London, London, UK
We investigate the spontaneous creation of primordial black holes in a lower-dimensional expanding early universe. We use the no-boundary proposal to construct instanton solutions for both the background and a black hole nucleated inside this background. The resulting creation rate could lead to a significant population of primordial black holes during the lower dimensional phase. We also consider the subsequent evaporation of these dimensionally reduced black holes and find that their temperature increases with mass, whereas it decreases with mass for 4-dimensional black holes. This means that they could leave stable sub-Planckian relics, which might in principle provide the dark matter.