# SPACE–TIME VARIATION OF PHYSICAL CONSTANTS AND THE EQUIVALENCE PRINCIPLE

@article{Nordtvedt2002SPACETIMEVO,
title={SPACE–TIME VARIATION OF PHYSICAL CONSTANTS AND THE EQUIVALENCE PRINCIPLE},
author={Kenneth Nordtvedt},
journal={International Journal of Modern Physics A},
year={2002},
volume={17},
pages={2711-2715}
}
• K. Nordtvedt
• Published 10 August 2002
• Physics
• International Journal of Modern Physics A
Location-dependence of physical parameters such as the electromagnetic fine structure constant and Newton's G produce body accelerations which violate universality of free fall rates testable with laboratory and space experiments. Theoretically related cosmological time variation of these same parameters are also constrained by experiments such as lunar laser ranging, and these time variations produce accelerations of bodies relative to a preferred cosmological inertial frame.
19 Citations
Fundamental constants and their variability in theories of high energy physics
The Standard Model of particle physics and the theory of General Relativity (GR) currently provide a good description of almost all phenomena of particle physics and gravitation that have received
Space-based Tests of Relativistic Gravitation
Since its initial publication, Einstein’s general theory of relativity had been tested to a very high precision and presently is considered to be the standard theory of gravitation, especially when
Tests of relativistic gravity in space
We review the foundations of Einstein’s general theory of relativity, discuss recent progress in the tests of relativistic gravity, and present motivations for new generation of high-accuracy
Composition-dependent long range forces from varying mp/me
We relate possible cosmological variations in the mass ratio μ ≡ mp/me and the fine structure constant α to long range composition-dependent forces mediated by a scalar field. The differential
Experimental Tests of General Relativity
Einstein's general theory of relativity is the standard theory of gravity, especially where the needs of astronomy, astrophysics, cosmology and fundamental physics are concerned. As such, this theory
Variations of the Fine Structure Constant in Space and Time
This thesis describes a detailed investigation of the effects of matter inhomogeneities on the cosmological evolution of the fine structure constant using the Bekenstein-Sandvik-Barrow-Magueijo
Experimental tests of general relativity: recent progress and future directions
The foundation of general relativity is reviewed, recent progress in tests of relativistic gravity is discussed, and motivations for the new generation of high-accuracy tests of new physics beyond general relativity are presented.
Equivalence Principle Violations and Couplings of a Light Dilaton
• Physics
• 2010
We consider possible violations of the equivalence principle through the exchange of a light ‘dilaton-like’ scalar field. Using recent work on the quark-mass dependence of nuclear binding, we find
Cosmology and Gravitation: the grand scheme for High-Energy Physics
These lectures describe how the Standard Model of cosmology ($\Lambda$CDM) has developped, based on observational facts but also on ideas formed in the context of the theory of fundamental
The Einstein Equivalence Principle and the Search for New Physics
One strategy for searching for effects due to quantum gravity (QG) is to employ the Einstein Equivalence Principle (EEP) as an operational tool. The EEP, consisting of the Universality of Free Fall,

## References

SHOWING 1-10 OF 13 REFERENCES
Equivalence Principle and Clocks
String theory suggests the existence of gravitational-strength scalar fields ("dilaton" and "moduli") whose couplings to matter violate the equivalence principle. This provides a new motivation for
G-dot/G and a cosmological acceleration of gravitationally compact bodies.
The binary pulsar system PSR 1913+16 is consequently found to be a somewhat less sensitive probe of a possible nonzero {ital {dot G}}/{ital G} than has been suggested.
General relativity as a cosmological attractor of tensor-scalar theories.
• Physics
Physical review letters
• 1993
Tensor-scalar theories of gravity are shown to generically contain an attractor mechanism toward general relativity, with the redshift at the beginning of the matter-dominated era providing the
THE RISE AND FALL OF THE SPIN ALIGNMENT IN DEEP-INELASTIC REACTIONS
• Physics
• 1980
Both the magnitude and alignment of the transferred angular momentum in the reaction {sup 165}Ho + {sup 165}Ho have been measured as a function of Q value via continuum {gamma}-ray multiplicity and
Relativity parameters determined from lunar laser ranging.
• Materials Science
Physical review. D, Particles and fields
• 1996
It is found that the Moon and Earth accelerate alike in the Sun's field and there is significant sensitivity to G\ifmmode \dot{}\else \.{}\fi{}/G through solar perturbations on the lunar orbit.
Physical Review
• Art
Nature
• 1965
Principle and Clocks in Gravitational Waves and Experimental Gravity
• Principle and Clocks in Gravitational Waves and Experimental Gravity
• 2000
Phys. Rev. Lett
• Phys. Rev. Lett
• 1990
Phys. Rev. Lett
• Phys. Rev. Lett
• 1993
Phys. Rev. D
• Phys. Rev. D
• 1996