Noncovariance at low accelerations as a route to MOND

Understand

MOND has limelighted the fact that Newtonian dynamics (ND) and general relativity (GR) have not been verified at accelerations below MOND's $a_0$.

• In particular, we do not know that all the principles underlying ND or GR apply below $a_0$.
• I discuss possible breakdown of general covariance (GC) in this limit.
• This resonates well with MOND, which hinges on accelerations.