Gravitation & Cosmology is an international peer reviewed journal published in collaboration with the Russian Gravitational Society. The journal provides rapid publications of high-quality research and review papers in the following fields: theoretical (classical and quantum) and experimental gravity; relativistic astrophysics and cosmology; exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravity; fundamental physical constants, fundamental gravity experiments in space and related topics. It covers widely the problems of fundamental physical constants and their possible variations.