Does the Fine-Structure Constant Really Vary in Time?
نویسندگان
چکیده
منابع مشابه
1 v 1 2 5 A ug 1 99 8 Does the Fine Structure Constant Really Vary in Time ?
We discuss how laboratory experiments can be used to place constraints on possible variations of the fine structure constant α in the observationally relevant redshift interval z ≃ 0 − 5, within a rather general theoretical framework. We find a worst case upper limit for ∆α/α of 8 × 10 −6 for z ≤ 5 and ∆α/α of 0.9 × 10 −6 for z ≤ 1.6. The derived limits are at variance with the recent findings ...
متن کاملDoes the fine-structure constant vary with cosmological epoch?
We use the strong nebular emission lines of O iii, 5007 Å and 4959 Å, to set a robust upper limit on the time dependence of the fine structure constant. We find |α−1dα(t)/dt| < 2 × 10−13 yr−1, corresponding to ∆α/α(0) = (0.7± 1.4) × 10−4 for quasars with 0.16 < z < 0.80 obtained from the SDSS Early Data Release. Using a blind analysis, we show that the upper limit given here is invariant with r...
متن کاملDoes the Fine Structure Constant Vary? a Third Quasar Absorption Sample Consistent with Varying Α
We report results from a third sample of quasar absorption line spectra from the Keck telescope which has been studied to search for any possible variation of the fine structure constant, α. This third sample, which is larger than the sum of the two previously published samples, shows the same effect, and also gives, as do the previous two samples, a significant result. The combined sample yiel...
متن کاملDoes the Fine Structure Constant Vary? a Detailed Investigation into Systematic Effects
We have previously presented 5.7 σ evidence for a smaller α at redshifts 0.2 < zabs < 3.7 from a sample of 128 Keck/HIRES quasar absorption systems: α/α = (−0.57 ± 0.10) × 10−5. A non-zero α/α manifests itself as a distinct pattern of shifts in the measured absorption line wavelengths. The statistical error is now small: we do detect small line shifts in the HIRES data. Whether these shifts are...
متن کاملTime Evolution of the Fine Structure Constant
We present a short review of the current quasar (QSO) absorption line constraints on possible variation of the fine structure constant, α ≡ e 2 /¯ hc. Particular attention is paid to recent optical Keck/HIRES spectra of 49 absorption systems which indicate a smaller α in the past [1, 2]. Here we present new preliminary results from 128 absorption systems: ∆α/α = (−0.57 ± 0.10) × 10 −5 over the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1998
ISSN: 0004-637X
DOI: 10.1086/311664