Physics

Gravitation

Newtonian dynamics

Cosmic microwave background

Newtonian fluid

Phenomenology (philosophy)

Epistemology

Dynamics (music)

Philosophy

Acoustics

Gravitational wave

Relativistic dynamics

Theoretical physics

Astrophysics

Quantum mechanics

Anisotropy

Classical mechanics

Physical Review Letters

We propose a relativistic gravitational theory leading to modified Newtonian dynamics, a paradigm that explains the observed universal galactic acceleration scale and related phenomenology. We discuss phenomenological requirements leading to its construction and demonstrate its agreement with the observed cosmic microwave background and matter power spectra on linear cosmological scales. We show that its action expanded to second order is free of ghost instabilities and discuss its possible embedding in a more fundamental theory.

New Relativistic Theory for Modified Newtonian Dynamics