Casimir Effects in the Chiral Bag Model

The chiral bag model is a successful model for the static properties (masses and moments) of a nucleon. In its formulation a non-trivial vacuum of confined fermions plays an important role of maintaining integral baryon number and positivity of the Hamiltonian. The origin of non-zero expectation values for various fermion bilinears in this vacuum is understood as a Casimir effect and the values of these are computed. A discussion is made of the infinities arising in the calculation. An overview of the chiral bag model and some of its predictions are given.