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Abstract: We investigate the structure of dynamics of large self-gravitatingastrophysical systems using a self-interacting two-component model. We considertwo cases, galaxy clusters and cosmic walls, for illustrations. In both casesstability analyses are conducted using perturbative expansion. We have foundthat waves and solitons are easily generated in these systems. Our analysisshows that dark matter can be Jeans unstable in the very inner regions ofgalaxy clusters if it has a large internal degree of freedom. The dark mattercore may collapse under external perturbations. We also discuss dark-matteroscillations in galaxy clusters and how mode growth and decay lead to heatingof intracluster medium. Our analysis shows that dark-matter solitons with bothpositive and negative amplitudes can be excited in cosmic walls. Resonances insoliton interaction could enhance gas condensation. The co-existence of the twotypes of dark-matter solitons implies that bright filaments can arise in darkvoids.



Autor: Kinwah Wu 1, Ziri Younsi 1,2, Curtis J. Saxton 1 1 Mullard Space Science Laboratory, University College London, UK, 2 Department

Fuente: https://arxiv.org/



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