27 citations
9 papers
Realizations of free actions via their fixed point algebras
Kay Schwieger, Stefan Wagner
Let be a compact group, let be a unital C-algebra, and let be a free C-dynamical system, in the sense of Ellwood, with fixed point alg…
An Atiyah Sequence for Noncommutative Principal Bundles
Kay Schwieger, Stefan Wagner
We present a derivation-based Atiyah sequence for noncommutative principal bundles. Along the way we treat the problem of deciding when a given -automorphism on the quantum bas…
E. Schrödinger's 1931 paper "On the Reversal of the Laws of Nature" ["Über die Umkehrung der Naturgesetze",Sitzungsberichte der preussischen Akademie der Wissenschaften, physikalische mathematische Klasse, 8 N9 144-153]
Raphaël Chetrite, Paolo Muratore-Ginanneschi, Kay Schwieger
We present an English translation of Erwin Schrödinger's paper on "On the Reversal of the Laws of Nature". In this paper Schrödinger analyses the idea of time reversal of a diffusi…
Lifting spectral triples to noncommutative principal bundles
Kay Schwieger, Stefan Wagner
Given a free action of a compact Lie group on a unital C*-algebra and a spectral triple on the corresponding fixed point algebra , we present a sys…
A model for calorimetric measurements in an open quantum system
Brecht Donvil, Paolo Muratore-Ginanneschi, Jukka P. Pekola +1
We investigate the experimental setup proposed in [New J. Phys., 15, 115006 (2013)] for calorimetric measurements of thermodynamic indicators in an open quantum system. As theoreti…
Noncommutative Coverings of Quantum Tori
Kay Schwieger, Stefan Wagner
We introduce a framework for coverings of noncommutative spaces. Moreover, we study noncommutative coverings of irrational quantum tori and characterize all such coverings that are…