Abstract The clock hypothesis in relativity states that the rate of time as measured by any is determined its Minkowskian proper-time, regardless nature motion; particular independent acceleration, depending only on instantaneous velocity. However, a unique proper-time may be assigned to an accelerating clock, physical system, limit being point-like. But clocks, their very nature, must spatiall...

Quantum mechanics allows the existence of “virtual states” that have no classical analog. Such virtual states defy direct observation through strong measurement, which would destroy the volatile virtual state. Here, we show how a virtual state of an interacting many-body system can be detected employing a weak measurement protocol with post-selection. We employ this protocol for the measurement...

Incrementally maintaining a qualitative understanding of physical system behavior based on observations is crucial to real-time process monitoring, diagnosis, and control. This paper describes the DATMI theory for dynamically maintaining a pinterp-,space, a concise representation of the local and global interpretations consistent with observations over time. Each interpretation signifies an alt...

Recently a t ime d i f fe rence measurement system was developed i n the Frequency & Time Standards Section o f the Nat ional Bureau o f Standards and independently a t the Nat ional Research Council which shows more than three orders of magnitude improvement over that which is cur ren t ly ava i lab le comnerc ia l l y . Cur ren t s ta te -o f the-ar t t ime d i f fe rence measurement devices ...

Most species living outside the tropical zone undergo physiological adaptations to seasonal environmental changes and changing day length (photoperiod); this phenomenon is called photoperiodism. It is well known that the circadian clock is involved in the regulation of photoperiodism such as seasonal reproduction, but the mechanism underlying circadian clock regulation of photoperiodism remains...