Gravitational waves in bimetric MOND
  I consider the weak field limit (WFL) of bimetric MOND (BIMOND): the lowest
order in the small departures Hmn and H'mn from double Minkowski space-time. In
particular, I look at propagating solutions, for a favorite subclass of BIMOND.
The WFL splits into two sectors for two linear combinations, Hmn+ and Hmn-, of
Hmn and H'mn. The Hmn+ sector is equivalent to the WFL of general relativity
(GR), with its gauge freedom, and has the same vacuum gravitational waves. The
Hmn- sector is fully nonlinear even for the weakest Hmn-, and inherits none of
the coordinate gauge freedom. The equations of motion are scale invariant in
the deep-MOND limit of purely gravitational systems. In these last two regards,
the BIMOND WFL is greatly different from that of other bimetric theories
studied to date. Despite the strong nonlinearity, an arbitrary pair of harmonic
GR wave packets of Hmn and H'mn moving in the same direction, is a solution of
the (vacuum) BIMOND WFL.
