Thursday, May 27, 2010

An efficient algorithm for the Riemannian 10j symbols - Greg Egan and Dan Christensen

"The 10j symbol is a spin network that appears in the partition function for the Barrett-Crane model of Riemannian quantum gravity. Elementary methods of calculating the 10j symbol require order(j^9) or more operations and order(j^2) or more space, where j is the average spin. We present an algorithm that computes the 10j symbol using order(j^5) operations and order(j^2) space, and a variant that uses order(j^6) operations and a constant amount of space. An implementation has been made available on the web. Comments: 9 pages, 5 postscript figures. This is the version that is to appear in Classical and Quantum Gravity. See also this http URL
Subjects: General Relativity and Quantum Cosmology (gr-qc)
Journal reference: Class.Quant.Grav. 19 (2002) 1185-1194"

5 out of 5

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