We investigate cosmological scenarios with spin-gravity coupling. In particular, due to the spin of baryonic and dark matter particles its coupling gravity, they probe an effective spin-dependent metric, which can be calculated semi-classically in Mathisson-Papapetrou-Tulczyjew-Dixon formalism. Hence, usual field equations give rise modified Friedmann equations, extra terms identified as dark-e...

Abstract The covariant canonical gauge theory of gravity (CCGG) is a field formulation which priori includes non-metricity and torsion. It extends the Lagrangian Einstein’s general relativity by terms at least quadratic in Riemann–Cartan tensor. This paper investigates implications metric compatible CCGG on cosmological scales. For totally anti-symmetric torsion tensor we derive resulting equat...

Minimally modified gravity is a class of models with only the two tensor degrees freedom as in general relativity. Using framework auxiliary constraints these can maintain dynamical cosmological background. The form thereby restricted by requirement dark energy and avoidance breakdown perturbation theory. Studying linear perturbations around FLRW background results are, however, quite insensiti...

Here, cosmology of the late and future universe is obtained from f(R)− gravity with non-linear curvature terms R and R (R being the Ricci scalar curvature). It is different from f(R)−dark energy models [6] where non-linear curvature terms are taken as gravitational alternative of dark energy. In the present model, neither linear nor non-linear curvature terms are taken as dark energy. Rather, d...

The holographic cut-off, in the formalism of generalized dark energy (HDE), is to depend on $L_\mathrm{IR} = L_\mathrm{IR} \left( L_\mathrm{p}, \dot \ddot \cdots, L_\mathrm{f}, a\right)$, where $L_\mathrm{p}$ and $L_\mathrm{f}$ are particle horizon future respectively, $a$ scale factor universe. Based such formalism, we showed that Barrow entropic (DE) model equivalent HDE respective cut-off de...

We show the importance of properly including the perturbations of the dark energy component in the dynamical dark energy models based on a scalar field and modified gravity theories in order to meet with present and future observational precisions. Based on a simple scaling scalar field dark energy model, we show that observationally distinguishable substantial differences appear by ignoring th...

We analyse the emergent cosmological dynamics corresponding to mean field hydrodynamics of quantum gravity condensates, in tensorial group theory formalism. focus particular on effects fundamental interactions, and contributions from different geometric modes. The general consequence such interactions is produce an accelerated expansion universe, which can happen both at early times, after boun...