# 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} }

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

- Physics
- 2008

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

- Physics
- 2016

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

- Physics, Geology
- 2008

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

- Physics
- 2007

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

- Physics
- 2008

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

- Physics
- 2006

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

- Physics
- 2008

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

- Physics
- 2015

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

- Physics
- 2003

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

- Physics
- 1999

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.

- PhysicsPhysical review letters
- 1990

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.

- PhysicsPhysical 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 SciencePhysical 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.

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