Index theory for locally compact noncommutative geometries by A. L. Carey, V. Gayral, A. Rennie, F. A. Sukochev

By A. L. Carey, V. Gayral, A. Rennie, F. A. Sukochev

Spectral triples for nonunital algebras version in the community compact areas in noncommutative geometry. within the current textual content, the authors turn out the neighborhood index formulation for spectral triples over nonunital algebras, with no the idea of neighborhood devices in our algebra. This formulation has been effectively used to calculate index pairings in several noncommutative examples. The absence of the other powerful approach to investigating index difficulties in geometries which are certainly noncommutative, quite within the nonunital scenario, was once a first-rate motivation for this examine and the authors illustrate this aspect with examples within the textual content. as a way to comprehend what's new of their method within the commutative surroundings the authors turn out an analogue of the Gromov-Lawson relative index formulation (for Dirac kind operators) for even dimensional manifolds with bounded geometry, with no invoking compact helps. For extraordinary dimensional manifolds their index formulation seems to be thoroughly new

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Thus we see that [D, b] ∈ B1∞ (D, p) since (λ + a)−1 ∈ B1∞ (D, p) ⊕ C and [D, a] ∈ B1∞ (D, p). Hence b ∈ AN,k for all N ≥ 1 and k ≥ 0 and so b ∈ Aδ,ϕ . We close this Section by giving a sufficient condition for a finitely summable spectral triple to be smoothly summable. We stress that this condition is easy to check, as shown in all of our examples. 21. Let (A, H, D) be a finitely summable spectral triple of spectral dimension p relative to (N , τ ). 7) (1 + D 2 )−s/4 Lk (T )(1 + D2 )−s/4 ∈ L1 (N , τ ), then (A, H, D) is smoothly summable.

9. Let (A, H, D) be a semifinite spectral triple relative to (N , τ ). For any μ > 0, define the ‘double’ of (A, H, D) to be the semifinite spectral triple (A, H2 , Dμ ) relative to (M2 (N ), τ ⊗ tr2 ), with H2 := H ⊕ H and the action of A and Dμ given by Dμ := D μ μ −D a→a ˆ := a 0 0 0 for all a ∈ A. If (A, H, D) is graded by γ, then the double is even and graded by γˆ := γ ⊕ −γ. Remark. Whether D is invertible or not, Dμ always is invertible, and Fμ = Dμ |Dμ |−1 has square 1. This is the chief reason for introducing this construction.

40 A. L. CAREY, V. GAYRAL, A. RENNIE, and F. A. SUKOCHEV Proof. 6) by (A CC , Fε ) with Fε = D(ε+D2 )−1/2 , ε > 0, while the class of (A, H2 , Dμ ) is represented by the Kasparov module (A M2 (C)M2 (C) , Fμ,ε ) with operator defined by Fμ,ε = Dμ (ε + Dμ2 )−1/2 . By Morita equivalence, this module has the same class as the module (A (C ⊕ C)C , Fμ,ε ), since M2 (C) (C ⊕ C)C is a Morita equivalence bimodule. The one-parameter family (A (C ⊕ C)C , Fm,ε )0≤m≤μ is a continuous operator homotopy, [36], from (A (C ⊕ C)C , Fμ,ε ) to the direct sum of two Kasparov modules (A CC , Fε ) ⊕ (A CC , −Fε ).

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