Theories of gravity

classical mechanics physical law

direction and intensity of gravity in every point of space

field of theoretical physics

constant representing stress-energy density of the vacuum in Einstein's equation, which accounts for the rate of expansion of the universe

hypothetical single, all-encompassing, coherent theoretical framework of physics

In theoretical physics, supergravity (supergravity theory; SUGRA for short) is a modern field theory that combines the principles of supersymmetry and general relativity; this is in contrast to non-gravitational supersymmetric theories such as the Minimal Supersymmetric Standard Model. Supergravity is the gauge theory of local supersymmetry. Since the supersymmetry (SUSY) generators form together with the Poincaré algebra and superalgebra, called the super-Poincaré algebra, supersymmetry as a gauge theory makes gravity arise in a natural way.

type of physical field theory unifying fundamental forces

theory that attempts to canonically quantize gravity via Ashtekar variables

field theory on a spacetime with small, compact extra dimensions beyond the large observed dimensions

alternative explanation of the non-Newtonian rotation of galaxies

principle that inertia is determined by the large-scale distribution of matter

physical theory that encodes fields on Minkowski space into complex analytic objects on twistor space via the Penrose transform

theory in modern physics that describes gravity as an entropic force

classical theory of gravitation

obsolete kinetic theory of gravity that explained Newton’s gravitational force in terms of streams of unseen particles impacting material objects from all directions

scalar–tensor theory of gravitation

classification system for different theories of gravity

restatement of Newton's law of universal gravitation

Theories in physics that postulate mechanisms of interaction governing the movements of bodies with mass

preprint

proposed theories of gravity

In theoretical physics, geometrodynamics is an attempt to describe spacetime and associated phenomena completely in terms of geometry. Technically, its goal is to unify the fundamental forces and reformulate general relativity as a configuration space of three-metrics, modulo three-dimensional diffeomorphisms. The origin of this idea can be found in an English mathematician William Kingdon Clifford's works. This theory was enthusiastically promoted by John Wheeler in the 1960s, and work on it continues in the 21st century.

predecessor to the theory of relativity

In theoretical physics, the hypothetical particle called the graviscalar or radion emerges as an excitation of general relativity's metric tensor, i.e. gravitational field, but is indistinguishable from a scalar in four dimensions, as shown in Kaluza–Klein theory. The scalar field \phi comes from a component of the metric tensor g_{55} where the figure 5 labels an additional fifth dimension. The only variations in the scalar field represent variations in the size of the extra dimension. Also, in models with multiple extra dimensions, there exist several such particles. Moreover, in theories wi

attempts to explain the action of gravity by aid of basic mechanical processe

relativistic generalization of Mordehai Milgrom's MOND paradigm

theory of gravity whose Lagrangian is some function of the Ricci scalar R

physics theory sometimes referred to as "gravity's rainbow"

model in which space-time curvature and its dynamics emerge as a mean field approximation of underlying microscopic degrees of freedom

Teleparallelism (also called teleparallel gravity), was an attempt by Albert Einstein to base a unified theory of electromagnetism and gravity on the mathematical structure of distant parallelism, also referred to as absolute or teleparallelism. In this theory, a spacetime is characterized by a curvature-free linear connection in conjunction with a metric tensor field, both defined in terms of a dynamical tetrad field.

theory of gravity with two metric tensors

Modified theory of gravity developed by John Moffat

Proposed model of gravity

theory of gravitation cast in the mathematical language of geometric algebra

Theoretical model of gravity

theory of fundamental physics