Limits on Cosmological Variation of Strong Interaction and Quark Masses   from Big Bang Nucleosynthesis, Cosmic, Laboratory and Oklo Data
  Recent data on cosmological variation of the electromagnetic fine structure constant from distant quasar (QSO) absorption spectra have inspired a more general discussion of possible variation of other constants. We discuss variation of strong scale and quark masses. We derive the limits on their relative change from (i) primordial Big-Bang Nucleosynthesis (BBN); (ii)   Oklo natural nuclear reactor, (iii) quasar absorption spectra, and (iv) laboratory measurements of hyperfine intervals. 
V.V. Flambaum and E.V. Shuryak