Abstract
It is showed that complex scalar fields with a self-interaction potential may propagate along null geodesics on isotropic flat Friedmann–Lemaître–Robertson–Walker universes with different time-dependent scale factors. This effect appears for certain kinds of self-interactions only, for different forms of potentials, and even for the massive case.
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Asenjo, F.A., Hojman, S.A. Light-like propagation of self-interacting Klein–Gordon fields in cosmology. Eur. Phys. J. Plus 137, 20 (2022). https://doi.org/10.1140/epjp/s13360-021-02266-2
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DOI: https://doi.org/10.1140/epjp/s13360-021-02266-2