Experimental Tests of Relativistic Gravity

TL;DR

This paper reviews experimental tests of Einstein's relativistic gravity, showing strong agreement with theory and discussing implications for potential scalar contributions, thus motivating further experimental investigations.

Contribution

It summarizes experimental validation of Einstein's theory and explores the possibility of scalar fields coexisting with general relativity, offering new theoretical perspectives.

Findings

Agreement between theory and experiment at 10^{-3} level

Verification of Einstein's basic gravitational structures

Potential existence of scalar contributions compatible with current tests

Abstract

The confrontation between Einstein's gravitation theory and experimental results, notably binary pulsar data, is summarized and its significance discussed. Experiment and theory agree at the 10^{-3} level or better. All the basic structures of Einstein's theory (coupling of gravity to matter; propagation and self-interaction of the gravitational field, including in strong-field conditions) have been verified. However, the theoretical possibility that scalar couplings be naturally driven toward zero by the cosmological expansion suggests that the present agreement between Einstein's theory and experiment might be compatible with the existence of a long-range scalar contribution to gravity (such as the dilaton field, or a moduli field, of string theory). This provides a new theoretical paradigm, and new motivations for improving the experimental tests of gravity.