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Area of Science:

  • Physics
  • Cosmology
  • Astrophysics

Background:

  • Fundamental constants underpin physical laws.
  • Variations in constants suggest new physics, potentially violating the universality of free fall.
  • Testing constant stability is crucial for validating general relativity.

Purpose of the Study:

  • To detail the relationships between fundamental constants.
  • To review experimental and observational constraints on constant variation.
  • To explore theoretical frameworks for varying constants.

Main Methods:

  • Analysis of atomic clocks, Oklo phenomenon, solar system observations, meteorite dating, quasar spectra, stellar physics, pulsar timing, CMB, and Big Bang Nucleosynthesis.
  • Examination of local position invariance and universality of free fall tests.
  • Review of theoretical models linking constant variations and unification mechanisms.

Main Results:

  • Compilation of experimental and observational constraints on the constancy of fundamental constants.
  • Identification of systematic effects and limitations in current tests.
  • Discussion of theoretical frameworks predicting potential variations.

Conclusions:

  • The constancy of fundamental constants is rigorously tested across diverse astrophysical and terrestrial systems.
  • Current data place stringent limits on potential variations, supporting the standard model of cosmology.
  • Further research explores theoretical implications and the fine-tuning problem of constant values.