EDP Sciences
Press Release
Free Access

Fig. 1.

image

Schematic cartoon of gravitational interactions between positive (in yellow) and negative (in purple) mass particles. Black vectors indicate the direction of the gravitational force, Fg = −GM1M2/r2, that is experienced by a given particle. Red vectors indicate the direction of the acceleration, a = Fg/M, that is experienced by a given particle when the weak equivalence principle holds. There are three possible cases: (i) top row: the familiar positive–positive mass interaction, in which both particles accelerate towards one another via gravitational attraction, (ii) middle row: the positive–negative mass interaction, in which both particles accelerate in the same direction – pointing from the negative mass towards the positive mass. This case is sometimes referred to as runaway motion, and (iii) bottom row: the negative–negative mass interaction, in which both particles accelerate away from one another via gravitational repulsion.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.