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Pseudo-Goldstone bosons couple with photons through a P and T violatinginteraction of the form ${\cal {L_I}}=g_{a\gamma \gamma}~ a F\tilde F$. Strongmagnetic fields in rotating compact stars induce a non-zero ${\vec E}\cdot{\vecB}$ outside the stellar surface which acts as a source for the pseudo-scalarfield. Pulsar signals propagating through this pseudo-scalar `hair' suffer adifferential time lag between the left and the right circularly polarised modesbecause of the P and T violating pseudoscalar boson-photon interaction.Determination of this time lag upto a microsecond accuracy can lead to ameasurment of (or rule out) pseudo-Goldstone boson-photon coupling upto $g_{a\gamma \gamma}\leq 4.6 \times 10^{-9}~GeV^{-1}$.Comment: Plain TeX,12 pages,IP/BBSR/92-9

Determination of pseudo-Goldstone-boson–photon coupling by the differential time delay of pulsar signals