[ital P] and [ital T] violation from certain dimension-eight Weinberg operators

Dimension-eight operators of the Weinberg type have been shown to give important contributions to [ital CP]-violating phenomena, such as the electric dipole moment of the neutron. In this Rapid Communication we show how operators related to these (and expected to occur on an equal footing) can give rise to time-reversal-violating phenomena such as atomic electric dipole moments. We also estimate the induced parity-violating phenomena such as small wrong'' parity admixtures in atomic states and find that they are negligible.