The exploration of the universe has recently entered a new era thanks to the multi-
messenger paradigm, characterized by a continuous increase in the quantity and quality of …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

Quantum gravity is sometimes considered as a kind of metaphysical speculation. In this
review, we show that, although still extremely difficult to reach, observational signatures can …

We investigate which Jordan frame F (R) gravity can describe a type IV singular bouncing
cosmological evolution, with special emphasis given near the point at which the type IV …

This chapter provides a review of the frameworks developed for cosmological perturbation
theory in loop quantum cosmology and applications to various models of the early universe …

In the matter bounce scenario, a dust-dominated contracting space-time generates scale-
invariant perturbations that, assuming a nonsingular bouncing cosmology, propagate to the …

We review the present status of quantum-gravity phenomenology in relation to gravitational
waves (GWs). The topic can be approached from two directions, a model-dependent one …

Symmetric teleparallel gravity offers to reformulate the gravitational formalism without the
presence of curvature and torsion with the help of non-metricity tensors. Interestingly …

The evolutions of the flat Friedmann-Lemaître-Robertson-Walker universe and its linear
perturbations are studied systematically in the dressed metric approach of loop quantum …

The Planck collaboration has provided us rich information about the early Universe, and a
host of new observational missions will soon shed further light on the'anomalies' that appear …