The status of experimental tests of general relativity and of theoretical frameworks for
analyzing them is reviewed and updated. Einstein's equivalence principle (EEP) is well …

Fundamental constants are a cornerstone of our physical laws. Any constant varying in
space and/or time would reflect the existence of an almost massless field that couples to …

The 2015 centenary of the publication of Einstein's general theory of relativity, and the first
detection of gravitational waves have focused renewed attention on the question of whether …

For centuries the heavens have been a natural laboratory to test the classical laws of motion,
and more recently to test Einstein's theory of gravity. Today, astrophysics has become a vast …

This article describes the various experimental bounds on the variation of the fundamental
constants of nature. After a discussion of the role of fundamental constants, their definition …

Pulsars of very different types, including isolated objects and binaries (with short-and long-
period orbits, and white-dwarf and neutron-star companions) provide the means to test both …

▪ Abstract Low-mass particles, such as neutrinos, axions, other Nambu-Goldstone bosons,
and gravitons, are produced in the hot and dense interior of stars. Therefore, astrophysical …

Improvements in our knowledge of the absolute value of the Newtonian gravitational
constant, G, have come very slowly over the years. Most other constants of nature are known …

A variation of Newton's constant $ G $ over cosmological time scales would modify the main-
squence time of globular cluster (GC) stars. We have calculated the evolution of low-mass …

Even though there have been various models of the time-varying speed of light (VSL), they
remain out of the mainstream because of their possible violation of physics laws built into …