The isotropy and homogeneity of the cosmic microwave background (CMB) favors “scalar
driven” early Universe inflationary models. However, gauge fields and other non-scalar …

We review an inflationary scenario with the anisotropic expansion rate. An anisotropic
inflationary universe can be realized by a vector field coupled with an inflaton, which can be …

We study an inflationary scenario with a vector field coupled with an inflaton field and show
that the inflationary Universe is endowed with anisotropy for a wide range of coupling …

Motivated by the recent results of Hansen et al. concerning a noticeable hemispherical
power asymmetry in the Wilkinson Microwave Anisotropy Probe (WMAP) data on small …

A suitable coupling of the inflaton φ to a vector kinetic term F 2 gives frozen and scale
invariant vector perturbations. We compute the cosmological perturbations ζ that result from …

We study primordial gravitational waves produced during inflation in quantum gravity at a
Lifshitz point proposed by Hořava. Assuming power-counting renormalizability, foliation …

We study the statistical nature of primordial fluctuations from an anisotropic inflation which is
realized by a vector field coupled to an inflaton. We find a suitable gauge, which we call the …

We study the backreaction problem in a mechanism of magnetogenesis from inflation. In
usual analysis, it has been assumed that the backreaction due to electromagnetic fields …

We compute the phenomenological signatures of a model [Watanabe et al. Phys. Rev. Lett.
102, 191302 (2009) PRLTAO 0031-9007 10.1103/PhysRevLett. 102.191302] of anisotropic …

We prove that many cosmological models characterized by vectors nonminimally coupled to
the curvature (such as the Turner-Widrow mechanism for the production of magnetic fields …