We consider R 2 inflation in the Palatini gravity assuming the existence of scalar fields
coupled to gravity in the most general manner. These theories, in the Einstein frame, and for …

In the context of scalar-tensor theories of gravity we compute the third-order corrected
spectral indices in the slow-roll approximation. The calculation is carried out by employing …

We present cosmological perturbation theory based on generalized gravity theories
including string theory correction terms and a tachyonic complication. The classical …

The tests of parity symmetry in the gravitational interaction is an attractive issue in
gravitational-wave astronomy. In the general theories of gravity with parity violation, one of …

The primordial power spectra of scalar and tensor perturbations during slow-roll inflation are
usually calculated with the method of Bessel function approximation. For constant-roll or …

Several cosmological measurements have attained significant levels of maturity and
accuracy over the past decade. Continuing this trend, future observations promise …

The next generation of cosmological observations will be sensitive to small deviations from a
pure power law in the primordial power spectrum of the curvature perturbations. In the …

We explore a mechanism to produce a light dark photon dark matter through a coupling
between the dark photon field and a spectator scalar field which plays no role in the …

Precise cosmological data from WMAP and forthcoming cosmic microwave background
experiments motivate the study of the quantum corrections to the slow roll inflationary …

We consider R 2 inflation in Palatini gravity, in the presence of scalar fields coupled to
gravity. These theories, in the Einstein frame, and for one scalar field h, share common …