### 0. PREFACE

The theory of large-scale structure is presently one of the most
active research areas in cosmology. The important questions being
studied include: Did structure form by gravitational instability?
What are the nature and amount of dark matter? What is the background
cosmological model? What were the initial conditions for structure
formation? It is exciting that we can ask these questions seriously,
knowing that observational tests are rapidly improving.

Numerous papers and reviews discuss specific theoretical models of
large-scale structure, or specific theoretical techniques for constructing
and analyzing models. However, there are few coherent presentations of the
basic physical theory of the dynamics of matter and spacetime in cosmology.
Although there are now several textbooks in this area, I think there is
still room for further pedagogical development. My aim in these lecture
notes is to provide a detailed yet readable introduction to cosmological
dynamics.

Although I gave an evening seminar on N-body techniques for simulating
large-scale structure, for reasons of length I have excluded that
subject from these notes. The subject is presented elsewhere (e.g.,
Hockney & Eastwood 1981,
Efstathiou et al. 1985,
Bertschinger & Gelb 1991,
and S. White's notes in this volume). Otherwise, these
notes generally follow the lectures I gave in Les Houches, except that
my lecture on Lagrangian fluid dynamics has been subsumed into the
section on relativistic perturbation theory. The former subject is
still evolving, and does not seem to be as fundamental as the subjects
of my other lectures.

I would like to thank Andrew Hamilton, Lam Hui, Bhuvnesh Jain,
Chung-Pei Ma, Dominik Schwarz, Uroš Seljak, and Simon White for
useful comments and discussion, and Rennan Bar-Kana, Chung-Pei Ma,
Nick Gnedin, and Marie Machacek for correcting several errors in
early drafts. I am grateful to the organizers and
students of the Les Houches Summer School for providing the opportunity
to present this material. I appreciate the hospitality of John Bahcall
and the Institute for Advanced Study, where much of the writing was done.
This work was supported by NASA grants NAGW-2807 and NAG5-2816.