Tensor–vector–scalar gravity

Tensor–vector–scalar gravity (TeVeS), developed by Jacob Bekenstein in 2004, is a relativistic generalization of Mordehai Milgrom's Modified Newtonian dynamics (MOND) paradigm.

The main features of TeVeS can be summarized as follows:

• As it is derived from the action principle, TeVeS respects conservation laws;
• In the weak-field approximation of the spherically symmetric, static solution, TeVeS reproduces the MOND acceleration formula;
• TeVeS avoids the problems of earlier attempts to generalize MOND, such as superluminal propagation;
• As it is a relativistic theory it can accommodate gravitational lensing.

The theory is based on the following ingredients:

• A unit vector field;
• A dynamical scalar field;
• A nondynamical scalar field;
• A matter Lagrangian constructed using an alternate metric;
• An arbitrary dimensionless function.

These components are combined into a relativistic Lagrangian density, which forms the basis of TeVeS theory.