Survival of the structures in the universe dominated by unstable dark matter

Details Survival of the structures in the universe dominated by unstable dark matter Survival of the structures in the universe dominated by unstable dark matter

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..841s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 15, 1986, p. 841-857.

Statistics

Computation

3

Computational Astrophysics, Cosmology, Matter (Physics), Missing Mass (Astrophysics), Systems Stability, Universe, Baryons, Energy Distribution, Galactic Clusters, Galactic Evolution, Nonlinear Systems, Particle Motion, Radioactive Decay, Vlasov Equations

Scientific paper

Dynamical evolution of non-linear structures in the universe dominated by unstable particles is studied by the numerical integration of the Vlasov equation. Their dynamical behaviour is determined by two parameters; one is the ratio of energy densities of baryons and unstable particles β and the other is the ratio of the lifetime of unstable particles τX to the initial free-fall time-scale tff,i. Non-linear structures satisfying the survival condition - τX/tff,i > 1/(2β2) - remains as bound systems irrespective of the decay of unstable particles. As long as one considers the cosmologically restricted range of τX and β, galaxies satisfy the survival condition and their evolution is well understood in terms of adiabatic behaviour. On the other hand, clusters of galaxies may be disrupted in future due to decay of unstable particles. A possible restriction to the formation of structures and the consequence of this scenario to the observed angular size of galaxies are discussed quantitatively.

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