From atomic physics, to upper-atmospheric chemistry, to cosmology: A "laser photometric ratio star" to calibrate telescopes at major observatories

TL;DR

This paper discusses using a laser photometric ratio star, created by exciting Earth's sodium layer, as a novel calibration tool for telescopes to improve measurements related to dark energy's nature.

Contribution

It introduces a new method employing laser photometric ratio stars for precise telescope calibration across multiple observatory disciplines.

Findings

Laser photometric ratio stars can provide accurate calibration at multiple wavelengths.

This method enhances the precision of cosmological measurements related to dark energy.

The approach integrates atomic physics, atmospheric chemistry, and cosmology.

Abstract

The expansion of our Universe is accelerating, due to dark energy. But the nature of dark energy has been a mystery since its discovery at the end of the past century. In Research Highlight https://doi.org/10.1002/ntls.20220003 , Justin Albert, Dmitry Budker and Hossein Sadeghpour provide an overview of how a laser photometric ratio star (a novel light source generated by laser excitation of the Earth's upper-atmospheric sodium layer, which will radiate equally brightly at wavelengths of 589 nm and 820 nm) can help us precisely calibrate telescopes in order to understand the nature of dark energy.