Abstract
A relativistic complex scalar boson field at finite temperature T is examined below its critical Bose–Einstein condensation temperature. It is shown that at the same T the state with antibosons has higher entropy, lower Helmholtz free energy and higher pressure than the state without antibosons — but the same Gibbs free energy as it should. This implies that the configuration without antibosons is metastable. Results are generalized for arbitrary d spatial dimensions.
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