Binary pulsar PSR B1913+16 constrains the electron-proton charge asymmetry

A binary stellar system loses its orbital rotational energy by the emission of gravity wave. If there exists a charge asymmetry between electron and proton then the system would also lose its orbital rotational energy due to electric dipole radiation provided the masses of the two objects are not exactly equal. Considering this fact and adopting the observed data of the binary pulsar PSR B1913+16, an upper bound on the electric charge asymmetry between electron and proton is obtained which is more stringent than the existing bounds.