Time Evolution of the CMB Quadrupole

TL;DR

This paper demonstrates that the CMB quadrupole changes more quickly than previously thought due to the Sun's acceleration towards the Galactic center, with measurable implications for cosmological observations.

Contribution

It reveals that local acceleration effects significantly influence the evolution of the CMB quadrupole, a factor not accounted for in earlier models.

Findings

Quadrupole evolves at ~10^{-9} per year due to solar acceleration.

Acceleration measured by Gaia EDR3 impacts CMB quadrupole evolution.

The evolution rate is an order of magnitude larger than previous estimates.

Abstract

I show that the quadrupole of the Cosmic Microwave Background (CMB) evolves more rapidly than previously expected, as a result of the acceleration of the Sun towards the Galactic center. The acceleration, measured most recently by Gaia EDR3, implies a fractional change in the quadrupole of ~10^{-9} per year, an order of magnitude larger than expected from the evolution in the last scattering surface of the CMB.