scholarly journals New Method of Searching for Cosmological Time Variation of the Fine-Structure Constant

2011 ◽  
Vol 126 (1) ◽  
pp. 177-184 ◽  
Author(s):  
T. D. Le
Keyword(s):  
Fine Structure ◽  
Time Variation ◽  
Structure Constant ◽  
New Method ◽  
Fine Structure Constant ◽  
Cosmological Time

Constraining the cosmological time variation of the fine - structure constant

Astrophysics ◽  
2010 ◽  
Vol 53 (3) ◽  
pp. 446-452 ◽  
Author(s):  
Le Duc Thong ◽  
Tran van Hung ◽  
Nguyen Thi Thu Huong ◽  
Ha Huy Bang
Keyword(s):  
Fine Structure ◽  
Time Variation ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Cosmological Time

scholarly journals Variation of the fundamental constants over the cosmological time: veracity of Dirac’s intriguing hypothesis

2016 ◽  
Vol 94 (1) ◽  
pp. 89-94 ◽  
Author(s):  
Cláudio Nassif ◽  
A.C. Amaro de Faria
Keyword(s):  
Fine Structure ◽  
Early Universe ◽  
Early Period ◽  
Planck Scale ◽  
Structure Constant ◽  
Energy Scale ◽  
Fine Structure Constant ◽  
Cosmological Time ◽  
Age Of The Universe ◽  
The Universe

We investigate how the universal constants, including the fine structure constant, have varied since the early universe close to the Planck energy scale (EP ∼ 1019 GeV) and, thus, how they have evolved over the cosmological time related to the temperature of the expanding universe. According to a previous paper (Nassif and Amaro de Faria, Jr. Phys. Rev. D, 86, 027703 (2012). doi:10.1103/PhysRevD.86.027703), we have shown that the speed of light was much higher close to the Planck scale. In the present work, we will go further, first by showing that both the Planck constant and the electron charge were also too large in the early universe. However, we conclude that the fine structure constant (α ≅ 1/137) has remained invariant with the age and temperature of the universe, which is in agreement with laboratory tests and some observational data. Furthermore, we will obtain the divergence of the electron (or proton) mass and also the gravitational constant (G) at the Planck scale. Thus, we will be able to verify the veracity of Dirac’s belief about the existence of “coincidences” between dimensionless ratios of subatomic and cosmological quantities, leading to a variation of G with time, that is, the ratio of the electrostatic to gravitational forces between an electron and a proton (∼1041) is roughly equal to the age of the universe divided by an elementary time constant, so that the strength of gravity, as determined by G, must vary inversely with time in the approximation of lower temperature or for times very far from the early period, to compensate for the time-variation of the Hubble parameter (H ∼ t−1). In short, we will show the validity of Dirac’s hypothesis only for times very far from the early period or T ≪ TP (∼1032 K).

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