Abstract
Using Luescher's small-volume expansion, mass spectrum and deconfining temperature of SU(3) gauge theory are evaluated. Including nonperturbative features by restoring symmetries which were broken in perturbation theory we obtain results which are valid up to intermediate volumes. The mass spectrum obtained is in good agreement with the perturbative results for small volumes, and with Monte Carlo data in medium-sized volumes. Using asymmetric volumes we are able to estimate the deconfining temperature and find reasonable agreement with Monte Carlo calculations.
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