Professor Cedric Lacey cedric.lacey@durham.ac.uk
Emeritus Professor
This paper presents an analysis of the linear evolution of short-wavelength perturbations in a background fluid flow which is undergoing gravitational collapse on large scales. Local evolution equations for perturbations to an arbitrary flow are derived in the linear regime and the short-wavelength limit. Local perturbation behavior in an inhomogeneous flow is found to be the same as that in a homogeneous anisotropic flow having the same local velocity field. Background flows in which the scale factors vary as power laws in time are considered to illustrate the relative effects of self-gravity, pressure and kinematics of the background flow on the density perturbation evolution. Perturbation analyses are then presented for more realistic background flows arising from the evolution into the nonlinear regime of initially small density perturbations in an isotropically expanding cosmological model. For low-pressure, inhomogeneous collapses, kinematic effects tend to dominate over self-gravity in driving perturbation growth as the collapse proceeds.
Lacey, C. G. (1989). Gravitational instability in a primordial collapsing gas cloud. Astrophysical Journal, 336, 612-638. https://doi.org/10.1086/167039
Journal Article Type | Article |
---|---|
Publication Date | Jan 15, 1989 |
Deposit Date | May 22, 2015 |
Publicly Available Date | May 22, 2015 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Electronic ISSN | 1538-4357 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 336 |
Pages | 612-638 |
DOI | https://doi.org/10.1086/167039 |
Public URL | https://durham-repository.worktribe.com/output/1582418 |
Related Public URLs | http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1989ApJ...336..612L&db_key=AST |
Published Journal Article
(484 Kb)
PDF
Copyright Statement
© 1989. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
FLAMINGO: calibrating large cosmological hydrodynamical simulations with machine learning.
(2023)
Journal Article
The complex interplay of AGN jet-inflated bubbles and the intracluster medium
(2023)
Journal Article
Active galactic nuclei jets simulated with smoothed particle hydrodynamics
(2023)
Journal Article
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
Apache License Version 2.0 (http://www.apache.org/licenses/)
Apache License Version 2.0 (http://www.apache.org/licenses/)
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2025
Advanced Search