The Bactra Review: Occasional and eclectic book reviews by Cosma Shalizi **112**
# A Unified Grand Tour of Theoretical Physics

Bristol: Institute of Physics / Adam Hilger, 1990

*Bon Voyage!*

This is an excellent presentation of the core theories of modern physics:
special and general relativity; quantum mechanics, quantum field theory, and the "standard model" of
elementary particles and their interactions; equilibrium statistical mechanics
and phase transitions; spontaneous symmetry breaking; and cosmology and the
early history of the universe, where all the other theories come together.
Moreover the word "unified" in the title is not just an in-joke. Through heavy
emphasis on differential geometry and the
use of action principles in his exposition of these theories, Lawrie brings out
their underlying conceptual and structural kinship. Whether these similarities
owe more to Nature's economy of means than to the feebleness of physicists'
powers of invention, who can say?
The presentation of the tensor calculus is somewhat old-fashioned, but
compact, sufficient and self-contained, as is that of the elements of
Lagrangian and Hamiltonian mechanics. Still, familiarity with classical
mechanics, electromagnetism and thermodynamics at the undergraduate level is a
must, and prior exposure to quantum mechanics probably very helpful. This
would make for a superb --- but very demanding --- survey course for
final-semester undergraduates. Since all these topics are covered in the
physics graduate curriculum, at roughly one class per two chapters of Lawrie's
book, it is otherwise perhaps best suited to self-study by those who have
completed their coursework and now want to see the essentials of their subject
from a single, illuminating, elegant point of view.

*Hint to friends and relations of physicists:* This book makes a fine
gift.

xiv + 380 pp., glossary of notation, bibliographies for further reading and
references, abundant diagrams

Physics

The first edition is currently (November 2004) out of print, but a second
edition (2001; unseen by me) is in print as a paperback, ISBN
0750306041 (US$49.95) and a hardback, ISBN
0750306033 (US$189).

5 January 2000; with thanks to Zmarak Shalizi and Isa Bernardini