Quantum-invariant theory and the evolution of a Dirac field in Friedmann–Robertson–Walker flat space-times
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- Gao, X., Fu, J. & Shen, J. Eur. Phys. J. C (2000) 13: 527. doi:10.1007/s100520000257
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On the basis of the generalized invariant formulation, the invariant-related unitary transformation method is used to study the evolution of a quantum Dirac field in Friedmann–Robertson–Walker spatially flat space-times. We first solve the functional Schrödinger equation for a free Dirac field and obtain the exact solutions. We then investigate the way of extending the method to treat the case in which there is an interaction between the Dirac field and a scalar field.