A century ago, Einstein formulated his elegant and elaborate theory of General Relativity,
which has so far withstood a multitude of empirical tests with remarkable success …

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

Inflationary models are usually based on dynamics of one or more scalar fields coupled to
gravity. In this work we present a new class of inflationary models, gauge-flation or non …

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 …

In [A. Maleknejad and MM Sheikh-Jabbari, arxiv: 1102.1513.] we introduced an inflationary
scenario, non-Abelian gauge field inflation or gauge-flation for short, in which slow-roll …

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 …

A bstract Chromo-Natural Inflation is the first worked example of a model of inflation in which
slow-roll inflation is achieved by “magnetic drift” as opposed to Hubble friction. In this work …

We review, compare and extend recent studies searching for evidence for a preferred
cosmological axis. We start from the Union2 SnIa dataset and use the hemisphere …

We perform the complete stability study of the model of chromo-natural inflation by Adshead
and Wyman [Phys. Rev. Lett. 108, 261302 (2012)], where, due to its coupling to a SU (2) …