Large-scale anomalies of the CMB in the curvaton scenario

TL;DR

This paper proposes an extension of the curvaton model to explain large-scale anomalies in the CMB, such as parity asymmetry and power anisotropies, offering a potential cosmic origin beyond systematics.

Contribution

It introduces a modified curvaton scenario that accounts for observed CMB anomalies, expanding the theoretical understanding of early universe perturbations.

Findings

Curvaton field can generate parity asymmetry in CMB.

Model explains large-scale power anisotropies.

Provides a cosmic explanation for CMB anomalies.

Abstract

We extend the curvaton scenario presented by Erickcek et al. (2008, 2009), to explain how the even-odd multipole asymmetry of the Cosmic Microwave Background (CMB) (also called parity asymmetry, (Kim & Naselsky 2010)) and power anisotropies can be generated by the curvaton field, which acts as an extra component to the spectrum of adiabatic perturbations in the inflationary epoch. Our work provides a possible cosmic explanation to the CMB large-scale asymmetry problems besides systematics and unknown residuals.