Mapping between eras in scale-covariant gravity with a van der Waals cosmological source
Abstract
In this paper, we apply the scale-covariant formalism established by Canuto et al. in order to connect different eras of fluid-driven universes. This technique depends on a scale function that can be adjusted by imposing different physical restrictions. In a previous work, Chaplygin fluid was considered as cosmological source; now a van der Waals constituent shows to be a consistent source to establish a mapping between an old decelerated-to-accelerated universe, ruled by Einstein equations, and an early universe, controlled by a modified gravitational theory. A similar situation emerges when a generalized Chaplygin fluid is considered. These cosmological properties are shown to be a direct consequence of an appropriate use of the scale-covariant technique, and can be seen as extensions of the original barotropic and plain Chaplygin cases.
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