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We study the finite temperature free energy and fermion number for Diracfields in a one-dimensional spatial segment, under local boundary conditionscompatible with the presence of a spectral asymmetry. We discuss in detail thecontribution of this part of the spectrum to the determinant. We evaluate thefinite temperature properties of the theory for arbitrary values of thechemical potential.Comment: Talk given at the Seventh International Workshop Quantum Field Theory  under the influence of External Conditions, QFEXT'05, Barcelona, Spain. Final  version, to appear in Journal of Physics A: Mathematical and Genera

Finite temperature properties of the Dirac operator with bag boundary conditions