Constraining Coupling Constants' Variation with Supernovae, Quasars, and GRBs

Understand

Dirac, in 1937 proposed the variation of coupling constants derived from his large number hypothesis.

• Efforts have continued since then to constrain their variation by various methods.
• We briefly discuss several methods used for the purpose while focusing primarily on the use of supernovae type 1a, quasars, and gamma-ray bursts (GRBs) as cosmological probes for determining cosmological distances.
• Supernovae type Ia (SNeIa) are considered the best standard candles since their intrinsic luminosity can be determined precisely from their light curves.