The Classical and Quantum 6j-symbols

Front Cover
Princeton University Press, 1995 - Mathematics - 164 pages
0 Reviews

Addressing physicists and mathematicians alike, this book discusses the finite dimensional representation theory of sl(2), both classical and quantum. Covering representations of U(sl(2)), quantum sl(2), the quantum trace and color representations, and the Turaev-Viro invariant, this work is useful to graduate students and professionals.

The classic subject of representations of U(sl(2)) is equivalent to the physicists' theory of quantum angular momentum. This material is developed in an elementary way using spin-networks and the Temperley-Lieb algebra to organize computations that have posed difficulties in earlier treatments of the subject. The emphasis is on the 6j-symbols and the identities among them, especially the Biedenharn-Elliott and orthogonality identities. The chapter on the quantum group Ub-3.0 qb0(sl(2)) develops the representation theory in strict analogy with the classical case, wherein the authors interpret the Kauffman bracket and the associated quantum spin-networks algebraically. The authors then explore instances where the quantum parameter q is a root of unity, which calls for a representation theory of a decidedly different flavor. The theory in this case is developed, modulo the trace zero representations, in order to arrive at a finite theory suitable for topological applications. The Turaev-Viro invariant for 3-manifolds is defined combinatorially using the theory developed in the preceding chapters. Since the background from the classical, quantum, and quantum root of unity cases has been explained thoroughly, the definition of this invariant is completely contained and justified within the text.


What people are saying - Write a review

We haven't found any reviews in the usual places.


Representations of Usl2
Quantum sl2
The Quantum Trace and Color Representations
The TuraevViro Invariant

Common terms and phrases

References to this book

All Book Search results »

About the author (1995)

Jim O'Connor is the author of What Was the Battle of Gettysburg? He also has written several non-fiction books for Random House, including Jackie Robinson and The Story of All-Black Baseball.

Bibliographic information