More about Path Integral for Spin
Kunio Funahashi, Taro Kashiwa, Shuji Nima, Seiji Sakoda
Abstract
Path integral for the SU(2) spin system is reconsidered. We show that the Nielsen-Rohrlich(NR) formula is equivalent to the spin coherent state expression so that the phase space in the NR formalism is not topologically nontrivial. We also perform the WKB approximation in the NR formula and find that it gives the exact result.
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