Singularities in any physical theory are either remarkable indicators of the unknown
underlying fundamental theory, or indicate a change in the description of the physical reality …

We systematically review some standard issues and also the latest developments of
modified gravity in cosmology, emphasizing on inflation, bouncing cosmology and late-time …

Mimetic gravity is a Weyl‐symmetric extension of General Relativity, related to the latter by a
singular disformal transformation, wherein the appearance of a dust‐like perfect fluid can …

We review inflationary cosmology in modified gravity such as R 2 gravity with its extensions
in order to generalize the Starobinsky inflation model. In particular, we explore inflation …

Cosmological inflation is discussed in the framework of F (R, G) gravity where F is a generic
function of the curvature scalar R and the Gauss–Bonnet topological invariant G. The main …

We investigate the descriptions for the observables of inflationary models, in particular, the
spectral index of curvature perturbations, the tensor-to-scalar ratio, and the running of the …

Traversable wormholes, tunnel-like structures introduced by Morris and Thorne [Am. J. Phys.
56 (1988) 395], have a significant role in connection of two different spacetimes or two …

We study several extensions of the Starobinsky model of inflation, which obey all
observational constraints on the inflationary parameters, by demanding that both the inflaton …

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 …

We study the tideless traversable wormholes in the f (R) gravity metric formalism. First we
consider three shape functions of wormholes and study their viabilities and structures. The …