Title: Axion structure formation – II. The wrath of collapse

Abstract

ABSTRACT The first paper in this series showed that quantum chromodynamic axion dark matter, as a highly correlated Bose fluid, contains extra-classical physics on cosmological scales. The source of the derived extra-classical physics is exchange–correlation interactions induced by the constraints of symmetric particle exchange and interaxion correlations from self-gravitation. The paper also showed that the impact of extra-classical physics on early structure formation is marginal, as the exchange–correlation interaction is inherently non-linear. This paper continues the study of axion structure formation into the non-linear regime, considering the case of full collapse and virialization. The N-body method is chosen to study the collapse, and its algorithms are derived for a condensed Bose fluid. Simulations of isolated gravitational collapse are performed for both Bose and cold dark matter fluids using a prototype N-body code. Unique Bose structures are found to survive even the most violent collapses. Bose post-collapse features include dynamical changes to global structures, creation of new broad sub-structures, violations of classical binding energy conditions, and new fine structures. Effective models of the novel structures are constructed and possibilities for their observation are discussed.

Authors:

Lentz, Erik W. ^[1]; Quinn, Thomas R. ^[2]; Rosenberg, Leslie J. ^[3]

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+ Show Author Affiliations

1. Institut für Astrophysik, Georg-August Universität Göttingen, Göttingen, D-Deutschland 37707, Germany, Department of Physics, University of Washington, Seattle, WA 98195-1560, USA
2. Department of Astronomy, University of Washington, Seattle, WA 98195-1580, USA
3. Department of Physics, University of Washington, Seattle, WA 98195-1560, USA

Publication Date:

2020-03-09

Research Org.:

Univ. of Washington, Seattle, WA (United States)

Sponsoring Org.:

USDOE Office of Science (SC)

OSTI Identifier:

1607601

Alternate Identifier(s):

OSTI ID: 1802236

Grant/Contract Number:  

SC0011665

Resource Type:

Published Article

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 493 Journal Issue: 4; Journal ID: ISSN 0035-8711

Publisher:

Oxford University Press

Country of Publication:

United Kingdom

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics; methods: numerical; galaxies: formation; galaxies: haloes; galaxies: structure; dark matter