Universe Today Podcast [Interview] Deep Dive Intro Primordial Black Holes
Jun 20, 2024
Astrophysicist Jason Kristiano discusses primordial black holes, their formation, impact on the Universe, observational methods, and potential as dark matter solution. From quantum fluctuations in inflation to gravitational wave detection challenges, the conversation explores new perspectives on cosmology and fundamental forces.
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Primordial Black Holes Form During Inflation
- Primordial black holes form from large, short-wavelength spacetime fluctuations produced during cosmic inflation.
- Those overdense regions can collapse directly into black holes without stars or galaxies forming first.
Fluctuations Are Spacetime Curvature
- The fluctuations are curvature variations in spacetime whose amplitude and wavelength determine collapse.
- If a region's curvature amplitude crosses a threshold it can produce a primordial black hole.
PBHs Could Seed Early Galaxies
- Primordial black holes can affect nucleosynthesis and act as seeds for early galaxy formation.
- A small primordial black hole population might explain unexpectedly early massive galaxies observed by JWST.