the abstract is clearer http://arxiv.org/abs/1107.2062 http://arxiv.org/abs/1107.2062. here's the relevant bit: Alternatively, it may be desirable to cloak th

the abstract is clearer http://arxiv.org/abs/1107.2062 http://arxiv.org/abs/1107.2062. here's the relevant bit: Alternatively, it may be desirable to cloak the occurrence of an event over a finite time period, and the idea of temporal cloaking was proposed in which the dispersion of the material is manipulated in time to produce a "time hole" in the probe beam to hide the occurrence of the event from the observer. This approach is based on accelerating and slowing down the front and rear parts, respectively, of the probe beam to create a well controlled temporal gap in which the event occurs so the probe beam is not modified in any way by the event.