scholarly journals Time-variability of the fine-structure constant expected from the Oklo constraint and the QSO absorption lines

2003 ◽  
Vol 573 ◽  
pp. 39-45 ◽  
Author(s):  
Yasunori Fujii
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Absorption Lines ◽  
Fine Structure Constant ◽  
Time Variability

Δα/α FROM QSO ABSORPTION LINES DRIVEN BY AN OSCILLATING SCALAR FIELD

2005 ◽  
Vol 14 (03n04) ◽  
pp. 677-685 ◽  
Author(s):  
YASUNORI FUJII ◽  
SHUNTARO MIZUNO
Keyword(s):  
Fine Structure ◽  
Scalar Field ◽  
Structure Constant ◽  
Oscillatory Behavior ◽  
Absorption Lines ◽  
Fine Structure Constant ◽  
Time Variability ◽  
The Past

The new result on the QSO absorption lines from the VLT–UVES sample is compared with the past reports on the time-variability of the fine-structure "constant" derived from the Keck/HIRES observation, on the basis of an oscillatory behavior of the scalar field supposed to be responsible for the cosmological acceleration.

scholarly journals HOW STRONGLY DOES DATING METEORITES CONSTRAIN THE TIME-DEPENDENCE OF THE FINE-STRUCTURE CONSTANT?

2005 ◽  
Vol 20 (32) ◽  
pp. 2417-2434 ◽  
Author(s):  
YASUNORI FUJII ◽  
AKIRA IWAMOTO
Keyword(s):  
Fine Structure ◽  
Scalar Field ◽  
Time Dependence ◽  
Structure Constant ◽  
Absorption Lines ◽  
Fine Structure Constant ◽  
Time Variability ◽  
Related Literature ◽  
The Past

We review our argument on the nature of the so-called meteorite constraint on the possible time-dependence of the fine-structure constant, emphasizing that dating meteorites at the present time is different in principle from searching directly for the traces in the past, as in the Oklo phenomenon and the QSO absorption lines. In the related literature, we still find some arguments not necessarily consistent with this difference to be taken properly into account. It does not immediately follow that any model-dependent approaches are useless in practice, though we cannot help suspecting that dating meteorites is no match for the Oklo and the QSO in probing the time-variability of the fine-structure constant, at this moment. Some of the relevance to the QSO data particularly in terms of the scalar field will be discussed.

scholarly journals Accelerating universe and the time-dependent fine-structure constant

2009 ◽  
Vol 5 (H15) ◽  
pp. 302-302
Author(s):  
Yasunori Fujii
Keyword(s):  
Fine Structure ◽  
Scalar Field ◽  
Structure Constant ◽  
Theoretical Background ◽  
Point Of View ◽  
Fine Structure Constant ◽  
Time Variability ◽  
Accelerating Universe ◽  
Tensor Theory ◽  
The Right

I start with assuming a gravitational scalar field as the dark-energy supposed to be responsible for the accelerating universe. Also from the point of view of unification, a scalar field implies a time-variability of certain “constants” in Nature. In this context I once derived a relation for the time-variability of the fine-structure constant α: Δα/α =ζ Ƶ(α/π) Δσ, where ζ and Ƶ are the constants of the order one, while σ on the right-hand side is the scalar field in action in the accelerating universe. I use the reduced Planckian units with c=ℏ =MP(=(8π G)−1/2)=1. I then compared the dynamics of the accelerating universe, on one hand, and Δα/α derived from the analyses of QSO absorption lines, Oklo phenomenon, also different atomic clocks in the laboratories, on the other hand. I am here going to discuss the theoretical background of the relation, based on the scalar-tensor theory invented first by Jordan in 1955.

scholarly journals Further constraints on variation of the fine-structure constant from alkali-doublet QSO absorption lines

2001 ◽  
Vol 327 (4) ◽  
pp. 1237-1243 ◽  
Author(s):  
M. T. Murphy ◽  
J. K. Webb ◽  
V. V. Flambaum ◽  
J. X. Prochaska ◽  
A. M. Wolfe
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Absorption Lines ◽  
Fine Structure Constant

scholarly journals Possible evidence for a variable fine-structure constant from QSO absorption lines: systematic errors

2001 ◽  
Vol 327 (4) ◽  
pp. 1223-1236 ◽  
Author(s):  
M. T. Murphy ◽  
J. K. Webb ◽  
V. V. Flambaum ◽  
C. W. Churchill ◽  
J. X. Prochaska
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Systematic Errors ◽  
Absorption Lines ◽  
Fine Structure Constant
Sign in / Sign up

Export Citation Format

Share Document