A limit on variations in the fine-structure constant from spectra of nearby Sun-like stars
A limit on variations in the fine-structure constant from spectra of nearby Sun-like stars
The fine structure constant α sets the strength of the electromagnetic force. The Standard Model of particle physics provides no explanation for its value, which could potentially vary. The wavelengths of stellar absorption lines depend on α but are subject to systematic effects owing to astrophysical processes in stellar atmospheres. …