DOES ANTIMATTER EMIT A NEW LIGHT

Contemporary theories of antimatter have a number of insufficiencies w hich stimulated the recent construction of the new isodual theory base d on a certain anti-isomorphic map of all (classical and quantum) form ulations of matter called isoduality. In this note we show that the is odual theory predicts that antimatter emits a new light, called isodua l light, which can be distinguished from the ordinary light emitted by matter via gravitational interactions (only). In particular, the isod ual theory predicts that all stable antiparticles such as the isodual photon, the positron and the antiproton experience antigravity in the field of matter (defined as the reversal of the sign of the curvature tensor), The antihydrogen atom is therefore predicted to: experience a ntigravity in the field of Earth; emit the isodual photon; and have th e same spectroscopy of the hydrogen atom, although subjected to an ant i-isomorphic isodual map. In this note we also show that the isodual t heory predicts that bound states of elementary particles and antiparti cles (such as the positronium) experience ordinary gravitation in both fields of matter and antimatter, thus bypassing known objections agai nst antigravity. A number of intriguing and fundamental, open theoreti cal and experimental problems of ''the new physics of antimatter'' are pointed out.