Veranstaltungsarchiv

Seminar

Titel

Seminar

Beschreibung

Quantum vacuum effects imply that particles can be created from vacuum due to the influence of an external time dependent perturbation, such as an intense short-pulse laser field. It is now understood that the detailed (possibly sub-cycle) temporal profile of the external pulse has a significant effect on the particle yield, due to quantum interference. Such particle rates are computed at asymptotic late times, after the external pulse has passed. In this talk I propose a new concept of super-adiabatic particle number that probes also intermediate times, raising the surprising possibility of defining particle number even during the creation process itself. The technical input is a remarkable result, due to Dingle and Berry, about universal behaviour of high orders of the adiabatic expansion. I also briefly mention applications to cosmological particle production in expanding and contracting cosmologies.

Ort

Seminarraum HI-Jena, Fröbelstieg 3

Datum (Start der Veranstaltung)

25.06.2014