Abstract
Exact solutions of the semi-classical Einstein equations for conformally invariant free quantum fields in an homogeneous and isotropic space-time, with cosmological constant and containing a classical scalar field, dust matter, an unquantised Dirac field and electromagnetic radiation are found. The initial behaviour of the semiclassical models is investigated. Some of the solutions found avoid the singularity and do not have particle horizons.
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Chimento, L.P., Zuccalá, N.A. Semi-Classical Cosmological Models with Scalar, Dirac and Electromagnetic Fields. Astrophysics and Space Science 254, 37–49 (1997). https://doi.org/10.1023/A:1000728002592
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DOI: https://doi.org/10.1023/A:1000728002592