Inspired by a definition of the closed-form instantaneous cross-correlation Wigner distribution (Zhang, 2019), we generalize the notion of Wigner distribution to the so-called free metaplectic Wigner ...

The Wigner–Smith (WS) time delay matrix relates a system’s scattering matrix to its frequency derivative and gives rise to the so-called WS modes that experience well-defined group delays when ...

The IERS will continue to monitor the Earth's rotation, as always, and will be able to confirm just how short these days in July and August are and whether we have a new record on our hands.