Open AccessTime Evolution of the CMB Quadrupole
Author(s) -
Abraham Loeb
Publication year - 2022
Publication title -
research notes of the aas
Language(s) - English
Resource type - Journals
ISSN - 2515-5172
DOI - 10.3847/2515-5172/ac5b12
Subject(s) - cosmic microwave background , quadrupole , astrophysics , physics , acceleration , galactic center , astronomy , classical mechanics , optics , atomic physics , galaxy , anisotropy
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 toward 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.