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Beyond Einstein Gravity: A Survey of Gravitational Theories for Cosmology and Astrophysics
1. Extended gravity: a primer.- 2. Mathematical Tools.- 3. The landscape beyond Einstein gravity.- 4. Spherical symmetry.- 5. Weak-field limit.- 6. Qualitative analysis and exact solutions in
f(T) teleparallel gravity and cosmology.
The role of torsion in gravity has been extensively investigated along the main direction of bringing gravity closer to its gauge formulation and incorporating spin in a geometric description, and various torsional constructions, from teleparallel, to Einstein-Cartan, and metric-affine gauge theories are reviewed.
Hybrid Metric-Palatini Gravity
Recently, the phenomenology of f(R) gravity has been scrutinized motivated by the possibility to account for the self-accelerated cosmic expansion without invoking dark energy sources. Besides, this
Strong Field Limit of Black Hole Gravitational Lensing
We give the formulation of the gravitational lensing theory in the strong field limit for a Schwarzschild black hole as a counterpart to the weak field approach. It is possible to expand the full
A time - luminosity correlation for Gamma - Ray Bursts in the X - rays
Gamma ray bursts (GRBs) have recently attracted much attention as a possible way to extend the Hubble diagram to very high redshift. However, the large scatter in their intrinsic properties prevents
Reconciling dark energy models with f(R) theories
Higher-order theories of gravity have recently attracted a lot of interest as alternative candidates to explain the observed cosmic acceleration without the need of introducing any scalar field. A
Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
We review different dark energy cosmologies. In particular, we present the ΛCDM cosmology, Little Rip and Pseudo-Rip universes, the phantom and quintessence cosmologies with Type I, II, III and IV
Low surface brightness galaxy rotation curves in the low energy limit of Rn gravity: no need for dark matter?
We investigate the possibility that the observed flatness of the rotation curves of spiral galaxies is not evidence for the existence of dark matter haloes, but rather a signal of the breakdown of