Primordial black holes in a dimensionally reduced universe

Abstract

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.

arXiv comment26 pages, 8 figures; v2 published in JCAP

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Cited by in corpus (5)

• Primordial black holes dark matter from inflection point models of inflation and the effects of reheating
• K-field kinks in two-dimensional dilaton gravity
• Primordial black holes in a dimensionally oxidizing Universe
• Noncommutative black holes in extended anti-de Sitter phase space
• Planckian charged black holes and their cosmological ramifications