Various pulsar timing array (PTA) experiments (NANOGrav, EPTA, PPTA, CPTA, including
data from InPTA) very recently reported evidence for excess red common-spectrum signals …

Ultralight bosons can affect the dynamics of spinning black holes (BHs) via superradiant
instability, which can lead to a time evolution of the supermassive BH shadow. We study …

We provide a theoretical model of F (R) gravity in which it is possible to describe in a unified
way inflation, an early and a late dark energy era, in the presence of a light axion particle …

We provide a compact review on recent developments on axion F (R) gravity. The axion field
is a string-theory–originated theoretical particle that is a perfect candidate for low-mass …

In the present paper, we use the holographic approach to describe the early-time
acceleration and the late-time acceleration eras of our Universe in a unified manner. Such …

Persisting tensions between high-redshift and low-redshift cosmological observations
suggest the dark energy sector of the Universe might be more complex than the positive …

In this paper, we study the influence of the axion-plasmon, as proposed in [Phys. Rev. Lett.
120, 181803 (2018) PRLTAO 0031-9007 10.1103/PhysRevLett. 120.181803] on the optical …

We present a model of F (R) gravity in the presence of a string theory motivated
misalignment axion like particle materialized in terms of a canonical scalar field minimally …

We investigate the effects of short axion kination eras on the energy spectrum of the
primordial gravitational waves corresponding to modes that reenter the Hubble horizon at …

The Hubble constant tension problem is analyzed in the framework of a class of modified
gravity, the so-called F (R) gravity. To do so, we explore two models: an exponential and a …