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There is no doubt that the field of Fundamental Constants in Physics andTheir Time Variation is one of the hottest subjects in modern theoretical andexperimental physics, with potential implications in all fundamental areas ofphysics research, such as particle physics, gravitation, astrophysics andcosmology. In this Special Issue, the state-of-the-art in the field ispresented in detail.

Fundamental Constants in Physics and Their Time Variation