Universe, Volume 5, Issue 11

We investigate the generalized Chevallier–Polarski–Linder (CPL) parametrization, which contains the pivoting redshift $z_p$ as an extra free parameter, in order to examine whether the evolution of the dark energy equation of state c...

In order to clarify the effects of the finite distance from a lens object to a light source and a receiver, the gravitational deflection of light has been recently reexamined by using the Gauss–Bonnet (GB) theorem in differential geometry (Ishi...

Power spectra always play an important role in the theory of inflation. In particular, the ability to reproduce the galaxy matter power spectrum $P(k)$ and the CMB temperature angular power spectrum $C_l$ ’s to high accuracy is of...

Gravitational waves astronomy allows us to study objects and events invisible in electromagnetic waves. It is crucial to validate the theories and models of the most mysterious and extreme matter in the Universe: the neutron stars. In addition to ins...

We study the apparent duality between large and small ${\eta }_H$ for the constant-roll inflation with the second slow-roll parameter ${\eta }_H$ being a constant. In the previous studies, only the constant-roll inflationary models with small...