  One of the most interesting features of braneworld models is the existence of
massive gravitational modes in addition to the usual massless one. Mixing of
the modes which depends nontrivially on the inter-brane distance can be
interpreted as radion-induced gravitational-wave oscillations, a classical
analogy to meson and neutrino oscillations. We show that these oscillations
arising in M-theory inspired two-brane setups could lead to effects detectable
by gravitational-wave interferometers.
