# 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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