What question did this study set out to answer?

The research aims to identify the potential common origin of cosmic microwave background anomalies.

April 7, 20260 citationsOpen Access

A Local Explanation for CMB Anomalies and the Eridanus Supervoid

Key Points

The research aims to identify the potential common origin of cosmic microwave background anomalies.
Proposes a new source of interference related to the heliospheric wake.
Utilizes data from NASA's IBEX mission.
Suggests observational tests with existing Gaia, IBEX, and CMB datasets.
Identifies correlation between the heliospheric structure and CMB quadrupole pattern.
Highlights the non-selective attenuation effects across electromagnetic frequencies.

Abstract

This paper proposes that several persistent anomalies in cosmic microwave background measurements — including the quadrupole-octupole alignment known as the axis of evil, the CMB Cold Spot, and the compound anomaly of the Eridanus supervoid — may share a common origin as artifacts of heliospheric wake interference. The heliotail of the solar system, confirmed by NASA's IBEX mission to subtend 40-60 degrees of sky and to exhibit a four-lobed structure geometrically consistent with the CMB quadrupole pattern, is proposed as an unaccounted broadband electromagnetic foreground. The mechanism is distinguished from conventional foreground effects by its non-selective attenuation across all electromagnetic frequencies. Observational tests using existing Gaia, IBEX, and CMB datasets are proposed.

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