frame-dragging
In Newtonian gravity , the gravitational field of a mass is independent of whether or not that mass rotates. In general relativity , a mass's rotation influences the motion of objects in its neighbourhood. Put simply, the rotating mass "drags along" ...
fourth test of general relativity
Another name for measurements of the Shapiro time delay as an addition to the three classical tests of general
force
In mechanics: Influence acting on a body, trying to accelerate it. More generally: All influences by which elementary or other particles can interact; in this sense, force and interaction are synonymous. In the standard model of particle ...
force particle
In the framework of relativistic quantum field theories (which form the theoretical basis of the physics of elementary particles, the forces by which matter particles interact are transmitted by so-called carrier particles travelling back and forth between ...
focus
In optics: A focus, also referred to as an image point, is the point where incoming, parallel light rays meet after traveling through a lens. In geometry: For an ellipse all points on the curve are located around two focal points, such that the sum of the ...
fluid
State of matter in which the constituent atoms and molecules are connected so loosely that the matter cannot maintain any shape without external support: If you place a fluid into a container, its shape will adapt to that of the container (in contrast with a ...
flat
A space is called flat if its geometry is the direct generalization of Euclidean geometry, the standard geometry taught in schools. By this definition, the simplest two-dimensional flat space is the plane, and ordinary, everyday three-dimensional space is ...
