Is Cosmic Parity Violation Responsible for the Anomalies in the WMAP Data?

TL;DR

This paper proposes that parity violation in general relativity could explain anomalies in WMAP data, linking cosmic-scale parity effects to inflationary leptogenesis and neutrino physics.

Contribution

It introduces a model where gravitational parity violation modifies the CMB power spectrum, explaining large-scale anomalies and connecting to leptogenesis.

Findings

Parity violation suppresses odd multipole power on large scales.

The model links anomalies to a massive right-handed neutrino.

Provides a potential observational window for leptogenesis.

Abstract

This research demonstrates that parity violation in general relativity can simultaneously explain the observed loss in power and alignment at a preferred axis ('Axis of Evil')in the low multipole moments of the WMAP data. This observational possibility also provides an experimental window for an inflationary leptogenesis mechanism arising from large-scale parity violation. A velocity dependent potential is induced from gravitational backreaction, which modifies the primordial scalar angular power spectrum of density perturbations in the CMB. This modification suppresses power of odd parity multipoles on large scales which can be associated with the scale of a massive right-handed neutrino.