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Title: Analytic description of primordial black hole formation from scalar field fragmentation

Abstract

We report that primordial black hole (PBH) formation is a more generic phenomenon than was once thought. The dynamics of a scalar field in inflationary universe can produce PBHs under mild assumptions regarding the scalar potential. In the early universe, light scalar fields develop large expectation values during inflation and subsequently relax to the minimum of the effective potential at a later time. During the relaxation process, an initially homogeneous scalar condensate can fragment into lumps via an instability similar to the gravitational (Jeans) instability, where the scalar self-interactions, rather than gravity, play the leading role. The fragmentation of the scalar field into lumps (e.g. Q-balls or oscillons) creates matter composed of relatively few heavy "particles", whose distribution is subject to significant fluctuations unconstrained by comic microwave background (CMB) observations and unrelated to the large-scale structure. If this matter component comes to temporarily dominate the energy density before the scalar lumps decay, PBHs can be efficiently produced during the temporary matter-dominated era. We develop a general analytic framework for description of PBH formation in this class of models. We highlight the differences between the scalar fragmentation scenario and other commonly considered PBH formation models. lASTLY, Given the existence of themore » Higgs field and the preponderance of scalar fields within supersymmetric and other models of new physics, PBHs constitute an appealing and plausible candidate for dark matter.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of California, Los Angeles, CA (United States); Advanced Analytics Center of Excellence, American Tire Distributors, Huntersville, NC (United States)
  2. Univ. of California, Los Angeles, CA (United States); Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe (WPI)
  3. Univ. of Tokyo (Japan). Kavli Inst. for the Physics and Mathematics of the Universe (WPI); Kyoto Univ. (Japan); National Taiwan Univ., Taipei (Taiwan)
  4. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF)
OSTI Identifier:
1608335
Grant/Contract Number:  
SC0009937; 15H05888; 15K21733; PHY-1607611
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 10; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Cotner, Eric, Kusenko, Alexander, Sasaki, Misao, and Takhistov, Volodymyr. Analytic description of primordial black hole formation from scalar field fragmentation. United States: N. p., 2019. Web. doi:10.1088/1475-7516/2019/10/077.
Cotner, Eric, Kusenko, Alexander, Sasaki, Misao, & Takhistov, Volodymyr. Analytic description of primordial black hole formation from scalar field fragmentation. United States. doi:https://doi.org/10.1088/1475-7516/2019/10/077
Cotner, Eric, Kusenko, Alexander, Sasaki, Misao, and Takhistov, Volodymyr. Thu . "Analytic description of primordial black hole formation from scalar field fragmentation". United States. doi:https://doi.org/10.1088/1475-7516/2019/10/077. https://www.osti.gov/servlets/purl/1608335.
@article{osti_1608335,
title = {Analytic description of primordial black hole formation from scalar field fragmentation},
author = {Cotner, Eric and Kusenko, Alexander and Sasaki, Misao and Takhistov, Volodymyr},
abstractNote = {We report that primordial black hole (PBH) formation is a more generic phenomenon than was once thought. The dynamics of a scalar field in inflationary universe can produce PBHs under mild assumptions regarding the scalar potential. In the early universe, light scalar fields develop large expectation values during inflation and subsequently relax to the minimum of the effective potential at a later time. During the relaxation process, an initially homogeneous scalar condensate can fragment into lumps via an instability similar to the gravitational (Jeans) instability, where the scalar self-interactions, rather than gravity, play the leading role. The fragmentation of the scalar field into lumps (e.g. Q-balls or oscillons) creates matter composed of relatively few heavy "particles", whose distribution is subject to significant fluctuations unconstrained by comic microwave background (CMB) observations and unrelated to the large-scale structure. If this matter component comes to temporarily dominate the energy density before the scalar lumps decay, PBHs can be efficiently produced during the temporary matter-dominated era. We develop a general analytic framework for description of PBH formation in this class of models. We highlight the differences between the scalar fragmentation scenario and other commonly considered PBH formation models. lASTLY, Given the existence of the Higgs field and the preponderance of scalar fields within supersymmetric and other models of new physics, PBHs constitute an appealing and plausible candidate for dark matter.},
doi = {10.1088/1475-7516/2019/10/077},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 10,
volume = 2019,
place = {United States},
year = {2019},
month = {10}
}

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Cited by: 7 works
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    Works referencing / citing this record:

    Clustering of primordial black holes formed in a matter-dominated epoch
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    Mass bound for primordial black hole from trans-Planckian censorship conjecture
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