CMB Lensing and Giant Rings

TL;DR

This paper investigates the potential CMB lensing signature of a pre-inationary particle linked to the giant rings anomaly, finding that detection is challenging unless it also explains local bulk flow measurements.

Contribution

It introduces a model connecting the giant rings anomaly with CMB lensing signals and explores the detectability of such signals under different assumptions.

Findings

CMB lensing signal to noise ratio is generally small for a PIP.

Correlation between giant rings and lensing signal is difficult to detect.

If PIP explains bulk flow, the lensing signal becomes more detectable.

Abstract

We study the CMB lensing signature of a pre-inationary particle (PIP), assuming it is responsible for the giant rings anomaly that was found recently in the WMAP data. Simulating Planck-like data we find that generically the CMB lensing signal to noise ratio associated with such a PIP is quite small and it would be difficult to cross correlate the temperature giant rings with the CMB lensing signal. However, if the pre-inationary particle is also responsible for the bulk flow measured from the local large scale structure, which happens to point roughly at the same direction as the giant rings, then the CMB lensing signal to noise ratio is fairly significant.