RADIATION OF THE 5TH-FORCE FIELD

The <<fifth-force>> field, if it exists, has radiative effects in competition with the gravitational radiation. Since this field violates the Principle of Equivalence, it may affect a gravitational wave detector more than a gravitational wave of the same amplitude, if the detector is made up of test bodies of different isotopic composition. Sources of gravitational waves will emit dipole <<fifth-force>> radiation as well; we discuss, in relation to the experimental constraints, the possible situations in which the new radiation is the prevailing energy loss. We find that this could be the case for binary systems similar to the binary pulsar, provided that their components have different isotopic composition (which is not the case for the binary pulsar itself).