Ellipsoidal Collapse and Previrialization | Zendy

Antonino Del Popolo | Zendy; E. N. Ercan | Zendy; Zicheng Xia | Zendy

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Ellipsoidal Collapse and Previrialization

Author(s) -

Antonino Del Popolo,

E. N. Ercan,

Zicheng Xia

Publication year - 2001

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/321137

Subject(s) - ellipsoid , density contrast , physics , perturbation (astronomy) , shear (geology) , conjecture , metric expansion of space , angular momentum , classical mechanics , mechanics , cosmology , mathematics , geology , astrophysics , petrology , astronomy , dark energy , pure mathematics , quantum mechanics

We study the non-linear evolution of a dust ellipsoid,embedded in a Friedmannflat background universe, in order to determine the evolution of the density ofthe ellipsoid as the perturbation to it related detaches from general expansionand begins to collapse. We show that while the growth rate of the densitycontrast of a mass element is enhanced by the shear in agreement with Hoffman(1986a), the angular momentum acquired by the ellipsoid has the right magnitudeto counterbalance the effect of the shear. The result confirms theprevirialization conjecture (Peebles & Groth 1976; Davis & Peebles 1977;Peebles 1990) by showing that initial asphericities and tidal interactionsbegin to slow down the collapse after the system has broken away from thegeneral expansion

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