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Formation, Gravitational Clustering and Interactions of Non-relativistic Solitons in an Expanding Universe

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arxiv 1902.07261 v3 pith:CWEUUDWA submitted 2019-02-19 astro-ph.CO gr-qchep-ph

Formation, Gravitational Clustering and Interactions of Non-relativistic Solitons in an Expanding Universe

classification astro-ph.CO gr-qchep-ph
keywords solitonsclusteringformationgravitationalsolitondrivenexpandingfield
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the formation, gravitational clustering and interactions of solitons in a self-interacting, non-relativistic scalar field in an expanding universe. Rapid formation of 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 and time scales, (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.

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