scholarly journals Frequency Ratio of Two Optical Clock Transitions inYb+171and Constraints on the Time Variation of Fundamental Constants

2014 ◽  
Vol 113 (21) ◽  
Author(s):  
R. M. Godun ◽  
P. B. R. Nisbet-Jones ◽  
J. M. Jones ◽  
S. A. King ◽  
L. A. M. Johnson ◽  
...  
Keyword(s):  
Time Variation ◽  
Frequency Ratio ◽  
Optical Clock ◽  
Fundamental Constants

ON TIME VARIATION OF FUNDAMENTAL CONSTANTS IN SUPERSTRING THEORIES

1988 ◽  
Vol 03 (03) ◽  
pp. 243-249 ◽  
Author(s):  
KEI-ICHI MAEDA
Keyword(s):  
String Theory ◽  
Symmetry Breaking ◽  
Time Variation ◽  
Susy Breaking ◽  
Internal Space ◽  
Fundamental Constants ◽  
Breaking Mechanism ◽  
Dimensional Gravity ◽  
Superstring Theories ◽  
String Theories

Assuming the action from the string theory and taking into account the dynamical freedom of a dilaton and its coupling to matter fluid, we show that fundamental ‘constants’ in string theories are independent of the ‘radius’ of the internal space. Since the scalar related to the ‘constants’ is coupled to the 4-dimensional gravity and matter fluid in the same way as in the Jordan-Brans-Dicke theory with ω=−1, it must be massive and can get a mass easily through some symmetry breaking mechanism (e.g. the SUSY breaking due to a gluino condensation). Consequently, time variation of fundamental constants is too small to be observed.

LIMITS ON THE TIME VARIATION OF FUNDAMENTAL CONSTANTS

2008 ◽  
Vol 23 (23) ◽  
pp. 1909-1912
Author(s):  
H. FRITZSCH
Keyword(s):  
Standard Model ◽  
Time Variation ◽  
Particle Physics ◽  
Fundamental Constants ◽  
The Standard Model ◽  
Time Variations ◽  
Time Changes ◽  
Far Future

We discuss possible time changes of the 28 fundamental constants of the Standard Model of Particle Physics. In particular, we concentrate on those constants, which are not known very precisely. Time variations of those constants might have been overlooked thus far. Future experiments should provide better limits, or might discover a time variation.

scholarly journals Testing Theories That Predict Time Variation of Fundamental Constants

2002 ◽  
Vol 570 (2) ◽  
pp. 463-469 ◽  
Author(s):  
Susana J. Landau ◽  
Hector Vucetich
Keyword(s):  
Time Variation ◽  
Fundamental Constants

scholarly journals Measuring space-time variation of the fundamental constants with redshifted submillimetre transitions of neutral carbon

2011 ◽  
Vol 533 ◽  
pp. A55 ◽  
Author(s):  
S. J. Curran ◽  
A. Tanna ◽  
F. E. Koch ◽  
J. C. Berengut ◽  
J. K. Webb ◽  
...  
Keyword(s):  
Time Variation ◽  
Space Time ◽  
Fundamental Constants ◽  
Measuring Space
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