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Astrophysics and Space Science

, Volume 182, Issue 2, pp 261–280 | Cite as

A theory for expanding, large-scale, isolated, spherically-symmetric density perturbations with null peculiar velocity field

  • E. Andriani
  • R. Caimmi
Article

Abstract

Exact theory for expanding density perturbations under the following assumptions: (i) Friedmann universes made of dust only; (ii) spherically-symmetric perturbations (iii) isolated perturbations; (iv) null peculiar velocity field; is reviewed and extended. The overdensity equation is derived and the related solution is determined concerning both mean overdensity and local overdensity, and including both the growing and the decreasing mode, in terms of non-dimensional variables normalized to the initial configuration. A first-order and zero-order approximation to the exact theory is also performed in view of applications to specific problems, e.g., the acquisition of angular momentum by tidal torques. The idealized case presented here makes a necessary reference in dealing with more general situations involving both analytical and numerical approaches.

Keywords

Dust Torque Angular Momentum Velocity Field Specific Problem 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • E. Andriani
    • 1
  • R. Caimmi
    • 2
  1. 1.Istituto Tecnico Industriale Statale ‘F. Severi’PadovaItalia
  2. 2.Dipartimento di AstronomiaUniversità di PadovaPadovaItalia

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