## The Gravitational Constant: Generalized Gravitational Theories and ExperimentsV. de Sabbata, George T. Gillies, Vitaly N. Melnikov An up-to-date description of progress and current problems with the gravitational constant, both in terms of generalized gravitational theories and experiments either in the laboratory, using Casimir force measurements, or in space at solar system distances and in cosmological observations. Contributions cover different aspects of the state and prediction of unified theories of the physical interactions including gravitation as a cardinal link, the role of experimental gravitation and observational cosmology in discriminating between them, the problem of the precise measurement and stability of fundamental physical constants in space and time, and the gravitational constant in particular. Recent advances discussed include unified and scalar-tensor theories, theories in diverse dimensions and their observational windows, gravitational experiments in space, rotational and torsional effects in gravity, basic problems in cosmology, early universe as an arena for testing unified models, and big bang nucleosynthesis. |

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acceleration astrophysical atomic Bergmann bivector black holes body brane models Casimir energy Casimir force consider constraints coordinate corresponding cosmic cosmological constant coupling curvature curves dark matter dark radiation dependence dimensional discussed distance dynamics Earth effects Einstein electromagnetic energy density equations of motion equivalence principle exact solutions experimental experiments extra dimensions field equations field theory flat model frame function geometric Gillies Grav gravitational constant gravitational field gravitational mass Gravitational Theories graviton graviton exchange integration interaction Ivashchuk Lagrangian Lett lunar mass-energy Melnikov metric Newton's gravitational Newton's gravitational law Newtonian observational obtained orbit p-branes parameters particles perturbation Peter Bergmann Phys physical potential predictions PUFT Q-units quantum gravity quaternionic radius relation relativistic Relativity rotation Sabbata scalar field scale Schmutzer solar space space-time spherically symmetric spin spinor temperature tensor term theories of gravity torsion uncertainty universe vector velocity