In the 1950's interest arose in the science-fiction idea of “antigravity”. This concept was a
speculation that matter and antimatter would repel each other in ordinary tensor …

There is increasing interest in the possibility of setting up terrestrial experiments for the direct
detection of galactic dark matter on the hypothesis that this may consist of new types of …

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 …

The generation of primary aerosols from biomass hinders the production of biofuels by
pyrolysis, intensifies the environmental impact of forest fires, and exacerbates the health …

The enunciation of the'fifth force'hypothesis in 1986 spawned a generation of experiments
searching for deviations from newtonian gravity. Although no compelling evidence for any …

We emphasize that it is the Pauli metric, not the Jordan metric, which describes the massless
spin-two graviton in the Brans-Dicke theory. Similarly in the ''Jordan-Brans-Dicke …

The negative results of the oscillations experiments are discussed with the hypothesis that
the various neutrino types are not universally coupled to gravity. In this case the transition …

This book provides the reader with a detailed and captivating account of the story where, for
the first time, physicists ventured into proposing a new force of nature beyond the four known …

The precise measurement of weak effects plays a pivotal role in metrology and in the
determination of the fundamental constants. Hence, the possibility of new weak forces, and …

It is discussed the possibility of testing the hypothesis that the proper acceleration of a
massive particle cannot exceed a natural limit, determined by its rest mass. To this aim the …