Formation, gravitational clustering, and interactions of nonrelativistic solitons in an expanding universe - INSPIRE

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Formation, gravitational clustering, and interactions of nonrelativistic solitons in an expanding universe

Mar 4, 2019

16 pages

Published in:

Phys.Rev.D 100 (2019) 6, 063507

Published: Sep 10, 2019

e-Print:

1902.07261 [astro-ph.CO]

DOI:

10.1103/PhysRevD.100.063507

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Abstract: (APS)

We investigate the formation, gravitational clustering, and interactions of solitons in a self-interacting, nonrelativistic scalar field in an expanding universe. Rapid formation of a large number of solitons is driven by attractive self-interactions of the field, whereas the slower clustering of solitons is driven by gravitational forces. Driven closer together by gravity, we see a rich plethora of dynamics in the soliton “gas” including mergers, scatterings, and formation of soliton binaries. The numerical simulations are complemented by analytic calculations and estimates of (i) the relevant instability length scales and timescales, (ii) individual soliton profiles and their stability, (iii) number density of produced solitons, and (iv) the two-point correlation function of soliton positions as evidence for gravitational clustering.

Note:

v3: 17 pages, 8 Figures. References added, extended discussion in the appendices, minor changes in the text. Matches version accepted for publication in PRD

Cosmology
space-time: expansion
structure
formation
soliton: formation
soliton
expansion: acceleration
interaction: nonrelativistic
force: gravitation
field theory: scalar

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Figures(21)

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