scholarly journals Inflation in Kaluza-Klein theory: Relation between the fine-structure constant and the cosmological constant

1998 ◽  
Vol 58 (10) ◽  
Author(s):  
Li-Xin Li ◽  
J. Richard Gott
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Klein Theory ◽  
Theory Relation ◽  
Kaluza Klein

scholarly journals The large number coincidence, the cosmic coincidence and the critical acceleration

2006 ◽  
Vol 462 (2076) ◽  
pp. 3657-3661 ◽  
Author(s):  
Scott Funkhouser
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Scaling Laws ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Coincidence Problem ◽  
Critical Acceleration ◽  
Physical Connection ◽  
Cosmic Parameters

The coincidence problem among the pure numbers of order near 10 40 is resolved with the Raychaudhuri and Friedmann–Robertson–Lemaitre–Walker equations and a trivial relationship involving the fine structure constant. The fact that the large number coincidence occurs only in the same epoch in which other coincidences among cosmic parameters occur could be considered a distinct coincidence problem suggesting an underlying physical connection. A natural set of scaling laws for the cosmological constant and the critical acceleration is identified that would resolve the coincidence among cosmic coincidences.

A FIVE DIMENSIONAL MODEL OF EFFECTIVE GRAVITATIONAL AND FINE-STRUCTURE CONSTANTS

2002 ◽  
Vol 17 (29) ◽  
pp. 4317-4323 ◽  
Author(s):  
J. P. MBELEK ◽  
M. LACHIÈZE-REY
Keyword(s):  
Fine Structure ◽  
Scalar Field ◽  
Gravitational Constant ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Five Dimensional Model ◽  
Bulk Scalar Field ◽  
Structure Constants ◽  
Good Agreement ◽  
Kaluza Klein

It is shown that the coupling of the Kaluza-Klein (KK) internal scalar field both to an external stabilizing bulk scalar field and to the geomagnetic field may explain the observed dispersion in laboratory measurements of the (effective) gravitational constant. Except the PTB 95 value, the predictions are found in good agreement with all of the experimental data. The cosmological variation of the fine-structure constant is also addressed.

scholarly journals Time-Varying Fine-Structure Constant Requires Cosmological Constant

2019 ◽  
Author(s):  
Rainer Kühne
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Preliminary Evidence ◽  
Fine Structure Constant ◽  
Time Varying ◽  
De Sitter ◽  
Sitter Universe ◽  
De Sitter Universe

Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein-de Sitter universe, however, it is compatible with cosmologies which require a large cosmological constant.

CONSTRAINTS ON THE DARK ENERGY EQUATION OF STATE IN PRESENCE OF A VARYING FINE STRUCTURE CONSTANT

2010 ◽  
Vol 19 (04) ◽  
pp. 507-512 ◽  
Author(s):  
E. MENEGONI ◽  
S. PANDOLFI ◽  
S. GALLI ◽  
M. LATTANZI ◽  
A. MELCHIORRI
Keyword(s):  
Fine Structure ◽  
Dark Energy ◽  
Equation Of State ◽  
Cosmological Constant ◽  
Energy Equation ◽  
Structure Constant ◽  
Hubble Constant ◽  
Fine Structure Constant ◽  
Cosmological Constraints ◽  
Energy Models

We discuss the cosmological constraints on the dark energy equation of state in the presence of primordial variations in the fine structure constant. We find that the constraints from CMB data alone on w and the Hubble constant are much weaker when variations in the fine structure constant are permitted. Vice versa, constraints on the fine structure constant are relaxed by more than 50% when dark energy models different from a cosmological constant are considered.

scholarly journals TIME-VARYING FINE-STRUCTURE CONSTANT REQUIRES COSMOLOGICAL CONSTANT

1999 ◽  
Vol 14 (27) ◽  
pp. 1917-1922 ◽  
Author(s):  
RAINER W. KÜHNE
Keyword(s):  
Fine Structure ◽  
Cosmological Constant ◽  
Structure Constant ◽  
Preliminary Evidence ◽  
Fine Structure Constant ◽  
Time Varying ◽  
De Sitter ◽  
Sitter Universe ◽  
De Sitter Universe

Webb et al. presented preliminary evidence for a time-varying fine-structure constant. We show Teller's formula for this variation to be ruled out within the Einstein–de Sitter universe, however, it is compatible with cosmologies which require a large cosmological constant.

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