This article is intended to review the recent developments in the Horndeski theory and its
generalization, which provide us with a systematic understanding of scalar–tensor theories …

After a decade and a half of research motivated by the accelerating universe, theory and
experiment have reached a certain level of maturity. The development of theoretical models …

We report on the implications for cosmic inflation of the 2018 release of the Planck cosmic
microwave background (CMB) anisotropy measurements. The results are fully consistent …

We analyse the Planck full-mission cosmic microwave background (CMB) temperature and
E-mode polarization maps to obtain constraints on primordial non-Gaussianity (NG). We …

We study generalized Galileons as a framework to develop the most general single-field
inflation models ever, Generalized G-inflation, containing yet further generalization of G …

We present the current accounting of systematic effect uncertainties for the Low Frequency
Instrument (LFI) that are relevant to the 2015 release of the Planck cosmological results …

The Planck full mission cosmic microwave background (CMB) temperature and E-mode
polarization maps are analysed to obtain constraints on primordial non-Gaussianity (NG) …

A bstract We apply the effective field theory approach to quasi-single field inflation, which
contains an additional scalar field with Hubble scale mass other than inflaton. Based on the …

In the Horndeski's most general scalar-tensor theories with second-order field equations, we
derive the conditions for the avoidance of ghosts and Laplacian instabilities associated with …

Scalar fields have played an important role in the development of the fundamental theories
of physics as well as in other branches of physics such as gravitation and cosmology. For a …