The connections between the anti-shielding effect, negative absolutetemperature and superluminal light propagation in both the instantaneouslyreversed electric field and the left-handed media are considered in the presentpaper. The instantaneous inversion of the exterior electric field may cause theelectric dipoles into the state of negative absolute temperature and thereforegive rise to a negative effective mass term of electromagnetic field (i. e.,the electromagnetic field propagating inside the negative-temperature mediumwill acquire an imaginary rest mass), which is said to result in the potentialsuperluminality effect of light propagation in this anti-shielding dielectric.In left-handed media, such phenomena may also arise.
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