Time-reversal frameness and superselection

Thermoelectrics of Interacting Nanosystems - Exploiting Superselection Instead of Time-Reversal Symmetry

Thermoelectric transport is traditionally analyzed using relations imposed by time-reversal symmetry, ranging from Onsager’s results to fluctuation relations in counting statistics. In this paper, we show that a recently discovered duality relation for fermionic systems—deriving from the fundamental fermion-parity superselection principle of quantum many-particle systems—provides new insights i...

Superselection Rules

This note provides a summary of the meaning of the term ‘Superselection Rule’ in Quantum Mechanics and Quantum-Field Theory. It is a contribution to the Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, edited by Friedel Weinert, Klaus Hentschel, Daniel Greenberger, and Brigitte Falkenburg.

Time - Reversal And

Symmetries, Superselection Rules, and Decoherence

We discuss the applicability of the programme of decoherence – emergence of approximate classical behaviour through interaction with the environment – to cases where it was suggested that the presence of symmetries would lead to exact superselection rules. For this discussion it is useful to make a distinction between pure symmetries and redundancies, which results from an investigation into th...

States, Symmetries and Superselection

The process of dynamical decoherence may cause apparent superselection rules, which are sometimes called ‘environmentally induced’ or ‘soft’. A natural question is whether such dynamical processes are eventually also responsible for at least some of the superselection rules which are usually presented as fundamentally rooted in the kinematical structure of the theory (so called ‘hard’ supersele...