Primordial black hole and wormhole formation by domain walls
Abstract
In theories with a broken discrete symmetry, Hubble sized spherical domain walls may spontaneously nucleate during inflation. These objects are subsequently stretched by the inflationary expansion, resulting in a broad distribution of sizes. The fate of the walls after inflation depends on their radius. Walls smaller than a critical radius fall within the cosmological horizon early on and collapse due to their own tension, forming ordinary black holes. But if a wall is large enough, its repulsive gravitational field becomes dominant much before the wall can fall within the cosmological horizon. In this ''supercritical'' case, a wormhole throat develops, connecting the ambient exterior FRW universe with an interior baby universe, where the exponential growth of the wall radius takes place. The wormhole pinches off in a timescale comparable to its lightcrossing time, and black holes are formed at its two mouths. As discussed in previous work, the resulting black hole population has a wide distribution of masses and can have significant astrophysical effects. The mechanism of black hole formation has been previously studied for a dustdominated universe. Here we investigate the case of a radiationdominated universe, which is more relevant cosmologically, by using numerical simulations in order to find themore »
 Authors:
 Institute of Cosmology, Tufts University, 574 Boston Ave, Medford, MA, 02155 (United States)
 Publication Date:
 OSTI Identifier:
 22679891
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BLACK HOLES; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; COSMOLOGICAL INFLATION; COSMOLOGICAL MODELS; DISTRIBUTION; FASTENING; GRAVITATIONAL FIELDS; MASS; PHARYNX; SYMMETRY; SYMMETRY BREAKING; UNIVERSE
Citation Formats
Deng, Heling, Garriga, Jaume, and Vilenkin, Alexander, Email: heling.deng@tufts.edu, Email: garriga@cosmos.phy.tufts.edu, Email: vilenkin@cosmos.phy.tufts.edu. Primordial black hole and wormhole formation by domain walls. United States: N. p., 2017.
Web. doi:10.1088/14757516/2017/04/050.
Deng, Heling, Garriga, Jaume, & Vilenkin, Alexander, Email: heling.deng@tufts.edu, Email: garriga@cosmos.phy.tufts.edu, Email: vilenkin@cosmos.phy.tufts.edu. Primordial black hole and wormhole formation by domain walls. United States. doi:10.1088/14757516/2017/04/050.
Deng, Heling, Garriga, Jaume, and Vilenkin, Alexander, Email: heling.deng@tufts.edu, Email: garriga@cosmos.phy.tufts.edu, Email: vilenkin@cosmos.phy.tufts.edu. Sat .
"Primordial black hole and wormhole formation by domain walls". United States.
doi:10.1088/14757516/2017/04/050.
@article{osti_22679891,
title = {Primordial black hole and wormhole formation by domain walls},
author = {Deng, Heling and Garriga, Jaume and Vilenkin, Alexander, Email: heling.deng@tufts.edu, Email: garriga@cosmos.phy.tufts.edu, Email: vilenkin@cosmos.phy.tufts.edu},
abstractNote = {In theories with a broken discrete symmetry, Hubble sized spherical domain walls may spontaneously nucleate during inflation. These objects are subsequently stretched by the inflationary expansion, resulting in a broad distribution of sizes. The fate of the walls after inflation depends on their radius. Walls smaller than a critical radius fall within the cosmological horizon early on and collapse due to their own tension, forming ordinary black holes. But if a wall is large enough, its repulsive gravitational field becomes dominant much before the wall can fall within the cosmological horizon. In this ''supercritical'' case, a wormhole throat develops, connecting the ambient exterior FRW universe with an interior baby universe, where the exponential growth of the wall radius takes place. The wormhole pinches off in a timescale comparable to its lightcrossing time, and black holes are formed at its two mouths. As discussed in previous work, the resulting black hole population has a wide distribution of masses and can have significant astrophysical effects. The mechanism of black hole formation has been previously studied for a dustdominated universe. Here we investigate the case of a radiationdominated universe, which is more relevant cosmologically, by using numerical simulations in order to find the initial mass of a black hole as a function of the wall size at the end of inflation. For large supercritical domain walls, this mass nearly saturates the upper bound according to which the black hole cannot be larger than the cosmological horizon. We also find that the subsequent accretion of radiation satisfies a scaling relation, resulting in a mass increase by about a factor of 2.},
doi = {10.1088/14757516/2017/04/050},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2017,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}

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