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We study in this paper the perturbations of the quintom dark energy model and the effects of
quintom perturbations on the current observations. Quintom describes a scenario of dark …

We solve one of the open problems in Einstein-Cartan theory, namely, we find a natural
matter source whose spin angular momentum tensor is compatible with the cosmological …

We show that the Einstein-aether theory of Jacobson and Mattingly (J&M) can be
understood in the framework of the metric-affine (gauge theory of) gravity (MAG). We …

The variation of dark energy density with redshift, ρX (z), provides a critical clue to the nature
of dark energy. Since ρX (z) depends on the dark energy equation of state wX (z) through an …

We derive the exact gravitational wave solutions in a general class of quadratic metric-affine
gauge gravity models. The Lagrangian includes all possible linear and quadratic invariants …

We consider cosmological solution for Einstein gravity with massive fermions with a four-
fermion coupling, which emerges from the Holst action and is related to the Barbero-Immirzi …

Cold dark matter may be in a metastable state and decays to other particles with a very long
lifetime. If the decaying products of the dark matter are weakly interacting, eg, neutrinos, then …

Recent measurements of distant type Ia supernovae (SNIa), as well as other observations,
indicate that our universe is in an accelerating phase of expansion. In principle, there are …

In this work we investigate the effects of torsion in the framework of Einstein–Cartan theory in
early cosmology. We study solutions for a homogeneous and isotropic relativistic …