We review the paradigm of quintom cosmology. This scenario is motivated by the
observational indications that the equation-of-state of dark energy across the cosmological …

We review some theoretical and phenomenological aspects of massive gravities in 4
dimensions. We start from the Fierz–Pauli theory with Lorentz-invariant mass terms and then …

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We investigate the consequences of an imperfect dark energy fluid on the large scale
structure. A phenomenological three parameter fluid description is used to study the effect of …

We propose a scenario where inflation is driven by non-minimally coupled massive vector
fields. In an isotropic homogeneous universe these fields behave in precisely the same way …

We consider the gravitational effects of a single, fixed-norm, Lorentz-violating timelike vector
field. In a cosmological background, such a vector field acts to rescale the effective value of …

In this paper I explore whether a vector field can be the origin of the present stage of cosmic
acceleration. In order to avoid violations of isotropy, the vector has be part of a'cosmic triad' …

We consider several new classes of viable vector field alternatives to the inflaton and
quintessence scalar fields. Spatial vector fields are shown to be compatible with the …

The general form of the anisotropy parameter of the expansion for Bianchi type-III metric is
obtained in the presence of a single diagonal imperfect fluid with a dynamically anisotropic …

In this article, we present a new family of solutions to the Einstein field equations of an
uncharged spherically symmetric anisotropic matter distribution in the context of f (Q) gravity …