109 citations · 208 across the 16 of their papers we have counts for
16 papers
Classification of Invariant Star Products up to Equivariant Morita Equivalence on Symplectic Manifolds
Stefan Jansen, Nikolai Neumaier, Gregor Schaumann +1
In this paper we investigate equivariant Morita theory for algebras with momentum maps and compute the equivariant Picard groupoid in terms of the Picard groupoid explicitly. We co…
Deformation Quantization of a Certain Type of Open Systems
Florian Becher, Nikolai Neumaier, Stefan Waldmann
We give an approach to open quantum systems based on formal deformation quantization. It is shown that classical open systems of a certain type can be systematically quantized into…
Complete Positivity of Rieffel's Deformation Quantization by Actions of
Daniel Kaschek, Nikolai Neumaier, Stefan Waldmann
In this paper we consider C*-algebraic deformations a la Rieffel and show that every state of the undeformed algebra can be deformed into a state of the deformed algebra in the sen…
Deformation Quantization of Surjective Submersions and Principal Fibre Bundles
Martin Bordemann, Nikolai Neumaier, Stefan Waldmann +1
In this paper we establish a notion of deformation quantization of a surjective submersion which is specialized further to the case of a principal fibre bundle: the functions on th…
Deformation Quantization of Poisson Structures Associated to Lie Algebroids
Nikolai Neumaier, Stefan Waldmann
In the present paper we explicitly construct deformation quantizations of certain Poisson structures on E^*, where E -> M is a Lie algebroid. Although the considered Poisson struct…
A C*-Algebraic Model for Locally Noncommutative Spacetimes
Jakob G. Heller, Nikolai Neumaier, Stefan Waldmann
Locally noncommutative spacetimes provide a refined notion of noncommutative spacetimes where the noncommutativity is present only for small distances. Here we discuss a non-pertur…