Search Results - "Mesland, Bram"
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Gauge Theory on Noncommutative Riemannian Principal Bundles
Published in Communications in mathematical physics (01-11-2021)“…We present a new, general approach to gauge theory on principal G -spectral triples, where G is a compact connected Lie group. We introduce a notion of…”
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2
Localised Module Frames and Wannier Bases from Groupoid Morita Equivalences
Published in The Journal of fourier analysis and applications (01-08-2021)“…Following the operator algebraic approach to Gabor analysis, we construct frames of translates for the Hilbert space localisation of the Morita equivalence…”
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3
A Groupoid Approach to Interacting Fermions
Published in Communications in mathematical physics (01-08-2022)“…We consider the algebra Σ ˙ ( L ) generated by the inner-limit derivations over the GICAR algebra of a fermion gas populating an aperiodic Delone set L . Under…”
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4
Equal rank local theta correspondence as a strong Morita equivalence
Published in Selecta mathematica (Basel, Switzerland) (01-09-2024)“…Let ( G , H ) be one of the equal rank reductive dual pairs M p 2 n , O 2 n + 1 or U n , U n over a nonarchimedean local field of characteristic zero. It is…”
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5
Spectral triples and finite summability on Cuntz–Krieger algebras
Published in Documenta mathematica Journal der Deutschen Mathematiker-Vereinigung. (2015)“…We produce a variety of odd bounded Fredholm modules and odd spectral triples on Cuntz–Krieger algebras by means of realizing these algebras as “the algebra of…”
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6
The Friedrichs angle and alternating projections in Hilbert C⁎-modules
Published in Journal of mathematical analysis and applications (01-12-2022)“…Let B be a C⁎-algebra, X a Hilbert C⁎-module over B and M,N⊂X a pair of complemented submodules. We prove the C⁎-module version of von Neumann's alternating…”
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7
Nonunital spectral triples and metric completeness in unbounded KK-theory
Published in Journal of functional analysis (01-11-2016)“…We consider the general properties of bounded approximate units in non-self-adjoint operator algebras. Such algebras arise naturally from the differential…”
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8
Classifying the dynamics of architected materials by groupoid methods
Published in Journal of geometry and physics (01-02-2024)Get full text
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9
Curvature and Weitzenböck formula for spectral triples
Published in Mathematische Nachrichten (09-10-2024)“…Abstract Using the Levi‐Civita connection on the noncommutative differential 1‐forms of a spectral triple , we define the full Riemann curvature tensor, the…”
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Addendum to: “The Friedrichs angle and alternating projections in Hilbert C⁎-modules” [J. Math. Anal. Appl. 516 (2022) 126474]
Published in Journal of mathematical analysis and applications (01-06-2023)“…We show by (counter)example that the intersection of complemented submodules in a Hilbert C⁎-module is not necessarily complemented, answering the last open…”
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Curvature of differentiable Hilbert modules and Kasparov modules
Published in Advances in mathematics (New York. 1965) (25-06-2022)“…In this paper we introduce the curvature of densely defined universal connections on Hilbert C⁎-modules relative to a spectral triple (or unbounded Kasparov…”
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12
Operator ∗‐correspondences in analysis and geometry
Published in Proceedings of the London Mathematical Society (01-08-2018)“…An operator ∗‐algebra is a non‐self‐adjoint operator algebra with completely isometric involution. We show that any operator ∗‐algebra admits a faithful…”
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13
Curvature and Weitzenbock formula for the Podle\'{s} quantum sphere
Published 26-06-2024“…We prove that there is a unique Levi-Civita connection on the one-forms of the Dabrowski-Sitarz spectral triple for the Podle\'{s} sphere $S^{2}_{q}$. We…”
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14
Curvature and Weitzenbock formula for spectral triples
Published 21-03-2024“…Using the Levi-Civita connection on the noncommutative differential one-forms of a spectral triple $(\B,\H,\D)$, we define the full Riemann curvature tensor,…”
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15
Existence and uniqueness of the Levi-Civita connection on noncommutative differential forms
Published 20-03-2024“…We combine Hilbert module and algebraic techniques to give necessary and sufficient conditions for the existence of an Hermitian torsion-free connection on the…”
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16
Classifying the Dynamics of Architected Materials by Groupoid Methods
Published 24-11-2023“…Journal of Geometry and Physics 196, 105059 (2024) We consider synthetic materials consisting of self-coupled identical resonators carrying classical internal…”
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17
A groupoid approach to interacting fermions
Published 25-03-2022“…Commun. Math. Phys. 394, 143-213 (2022) We consider the algebra $\dot\Sigma(\mathcal L)$ generated by the inner-limit derivations over the ${\rm GICAR}$…”
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18
The logarithmic Dirichlet Laplacian on Ahlfors regular spaces
Published 28-09-2023“…We introduce the logarithmic analogue of the Laplace-Beltrami operator on Ahlfors regular metric-measure spaces. This operator is intrinsically defined with…”
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19
The Friedrichs angle and alternating projections in Hilbert $C^{}$-modules
Published 07-12-2021“…J. Math. Anal. Appl. 516 (1) 1 (2022) 126474 Let $B$ be a $C^{*}$-algebra, $X$ a Hilbert $C^{*}$-module over $B$ and $M,N\subset X$ a pair of complemented…”
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20
Gauge theory on noncommutative Riemannian principal bundles
Published 26-07-2021“…Commun. Math. Phys. 388, 107-198 (2021) We present a new, general approach to gauge theory on principal $G$-spectral triples, where $G$ is a compact connected…”
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