Abstract
A new variational principle for the calculation of the partition function is introduced. In contradiction to the usual methods we derive a lower bound for the free energy. We use this method to compute the quantal mass renormalization of the thermal soliton in the φ4-chain.
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© 1981 Plenum Press, New York
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Bolterauer, H., Rosin, B. (1981). A New Variational Principle and the Quantum Statistics of the φ4-Soliton. In: Devreese, J.T., Lemmens, L.F., Van Doren, V.E., Van Royen, J. (eds) Recent Developments in Condensed Matter Physics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1086-0_23
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DOI: https://doi.org/10.1007/978-1-4684-1086-0_23
Publisher Name: Springer, Boston, MA
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