부산대학교 도서관

Exploring the cosmological variations of fundamental dimensionless constants, such as the fine-structure constant, α , the proton-to-electron mass ratio, μ , and the gravitational constant, G, is essential for testing new phenomena beyond the standard cosmological models. This study focuses on investigating the potential variation of constants by analyzing strong gravitational fields associated with white dwarf stars. Utilizing the observed spectrum of G191-B2B, we present a new constraint on the cosmological variation of μ over extended time scales, Δ μ / μ = (0. 0 8 4 ± 1. 0 4 4) × 1 0 − 8 , incorporating the gravitational redshift z ≈ 5 × 1 0 − 5 . This finding represents a new tool for checking the parameters for Grand Unified Theories (GUTs). [ABSTRACT FROM AUTHOR]