https://doi.org/10.1140/epjp/s13360-021-02266-2
Regular Article
Light-like propagation of self-interacting Klein–Gordon fields in cosmology
1
Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, 7491169, Santiago, Chile
2
Departamento de Ciencias, Facultad de Artes Liberales, Universidad Adolfo Ibáñez, 7491169, Santiago, Chile
3
Departamento de Física, Facultad de Ciencias, Universidad de Chile, 7800003, Santiago, Chile
4
Centro de Recursos Educativos Avanzados, CREA, 7500018, Santiago, Chile
Received:
1
June
2021
Accepted:
4
December
2021
Published online:
14
December
2021
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.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021
