期刊
PHYSICAL REVIEW D
卷 100, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.063507
关键词
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资金
- FAS Division of Science, Research Computing Group at Harvard University
- DOE [DE-SC0018216]
- NASA through Einstein Postdoctoral Fellowship - Chandra X-ray Center [PF7-180164]
- NASA [NAS8-03060]
- National Science Foundation [PHY-1607611]
- U.S. Department of Energy (DOE) [DE-SC0018216] Funding Source: U.S. Department of Energy (DOE)
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.
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