The self-creation cosmology theory of gravity (1982) by G.A. Barber in which the Brans–Dicke theory is modified to allow mass creation Loop quantum gravity (1988) by Carlo Rovelli, Lee Smolin, and Abhay Ashtekar Nonsymmetric gravitational theory (NGT) (1994) by John Moffat Tensor–vector–scalar gravity (TeVeS) (2004), a relativistic modification of MOND by Jacob Bekenstein Chameleon theory (2004) by Justin Khoury and Amanda Weltman. Pressuron theory (2013) by Olivier Minazzoli and Aurélien Hees. Conformal gravity Gravity as an entropic force, gravity arising as an emergent phenomenon from the thermodynamic concept of entropy. In the superfluid vacuum theory the gravity and curved spacetime arise as a collective excitation mode of non-relativistic background superfluid. Massive gravity, a theory where gravitons and gravitational waves have a non-zero mass See also Anti-gravity, the idea of neutralizing or repelling gravity Artificial gravity Equations for a falling body Escape velocity Atmospheric escape Gauss's law for gravity Gravitational potential Micro-g environment, also called microgravity Newton's laws of motion Standard gravitational parameter Weightlessness Footnotes References Further reading External links The Feynman Lectures on Physics Vol. I Ch. 7: The Theory of Gravitation Fundamental interactions Acceleration Articles containing video clips Empirical laws