Author:
Owusu Stephen,da Silveira Ferreira Pedro,Notari Alessio,Quartin Miguel
Abstract
Abstract
The Cosmic Microwave Background (CMB) anisotropies are thought to be statistically
isotropic and Gaussian. However, several anomalies are observed, including the CMB Cold Spot, an
unexpected cold ∼ 10° region with p-value ≲ 0.01 in standard
ΛCDM. One of the proposed origins of the Cold Spot is an unusually large void on the line
of sight, that would generate a cold region through the combination of integrated Sachs-Wolfe and
Rees-Sciama effects. In the past decade extensive searches were conducted in large scale
structure surveys, both in optical and infrared, in the same area for z ≲ 1 and did find
evidence of large voids, but of depth and size able to account for only a fraction of the
anomaly. Here we analyze the lensing signal in the Planck CMB data and rule out the hypothesis
that the Cold Spot could be due to a large void located anywhere between us and the surface of
last scattering. In particular, computing the evidence ratio we find that a model with a large
void is disfavored compared to ΛCDM, with odds 1 : 13 (1 : 20) for SMICA (NILC) maps,
compared to the original odds 56 : 1 (21 : 1) using temperature data alone.
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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