as the time-evolution operator, and has the crucial property that it is unitary. This time evolution is deterministic in the sense that – given an initial...

{U}}(t)=e^{-i{\hat {H}}t/\hbar }} is known as the time-evolution operator, and it is unitary: it preserves the inner product between vectors in the Hilbert space. Unitarity...

include the mathematician and physicist Henri Poincaré; physicists Henri Becquerel, Pierre and Marie Curie, who remain famous for their work on radioactivity;...

value is an extended real number (that is in [0, ∞]) and this is clearly a unitary invariant of S. Remark. It is indeed possible that H(S) = +∞ for some density...

low-level waste is no more than four giga-becquerels per tonne of alpha activity or twelve giga-becquerels per tonne of gamma-beta activity. An example...

X-rays in experiments with electron beams in plasma. 1896 – Antoine Henri Becquerel accidentally discovers radioactivity while investigating the work of Wilhelm...

recognized the formula as the pair correlation function of the Gaussian unitary ensemble, which physicists have studied extensively. This suggested that...