CMB Anisotropies and Inflation from Non-Standard Spinors

TL;DR

This paper investigates how non-standard spinor-driven inflation could explain the observed large-scale anisotropies in the cosmic microwave background, proposing an alternative to scalar field models.

Contribution

It introduces a model of anisotropic inflation driven by non-standard spinors, predicting specific imprints on CMB anisotropies not accounted for by scalar field inflation.

Findings

Anisotropic inflation suppresses low multipole amplitudes in the primordial power spectrum.

The model naturally explains the observed large-scale alignments in the CMB.

It retains the usual inflationary features while introducing anisotropy.

Abstract

The apparent alignment of the cosmic microwave background multipoles on large scales challenges the standard cosmological model. Scalar field inflation is isotropic and cannot account for the observed alignment. We explore the imprints, a non-standard spinor driven inflation would leave on the cosmic microwave background anisotropies. We show it is natural to expect an anisotropic inflationary expansion of the Universe which has the effect of suppressing the low multipole amplitude of the primordial power spectrum, while at the same time to provide the usual inflationary features.