Generally covariant model of a scalar field with high frequency dispersion and the cosmological horizon problem

@article{Jacobson2000GenerallyCM,
  title={Generally covariant model of a scalar field with high frequency dispersion and the cosmological horizon problem},
  author={Ted Jacobson and David M. Mattingly},
  journal={Physical Review D},
  year={2000},
  volume={63},
  pages={041502}
}
Short distance structure of spacetime may show up in the form of high freqency dispersion. Although such dispersion is not locally Lorentz invariant, we show in a scalar field model how it can nevertheless be incorporated into a generally covariant metric theory of gravity provided the locally preferred frame is dynamical. We evaluate the resulting energy-momentum tensor and compute its expectation value for a quantum field in a thermal state. The equation of state differs at high temperatures… Expand
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