Moduli Entrapment with Primordial Black Holes
Nemanja Kaloper, Joachim Rahmfeld, Lorenzo Sorbo

TL;DR
This paper proposes that primordial black holes in the early universe can effectively address the moduli overshoot problem in string cosmology by capturing and slowing moduli evolution, facilitating inflation.
Contribution
It introduces a novel mechanism where a gas of black holes in the early universe traps moduli, providing a new solution to the overshoot problem in string cosmology.
Findings
Black hole gas captures moduli near the Planck scale.
Moduli are slowed down and can roll into an inflationary valley.
Black holes redshift away during cosmic expansion.
Abstract
We argue that primordial black holes in the early universe can provide an efficient resolution of the Brustein-Steinhardt moduli overshoot problem in string cosmology. When the universe is created near the Planck scale, all the available states in the theory are excited by strong interactions and cosmological particle production. The heavy states are described in the low energy theory as a gas of electrically and magnetically charged black holes. This gas of black holes quickly captures the moduli which appear in the relation between black hole masses and charges, and slows them down with their vevs typically close to the Planck scale. From there, the modulus may slowly roll into a valley with a positive vacuum energy, where inflation may begin. The black hole gas will redshift away in the course of cosmic expansion, as inflation evicts black holes out of the horizon.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
