Connes-Chern character for manifolds with boundary and eta by Matthias Lesch

By Matthias Lesch

The authors show the Connes-Chern of the Dirac operator linked to a b-metric on a manifold with boundary when it comes to a retracted cocycle in relative cyclic cohomology, whose expression will depend on a scaling/cut-off parameter. Blowing-up the metric one recovers the pair of attribute currents that characterize the corresponding de Rham relative homology category, whereas the blow-down yields a relative cocycle whose expression comprises greater eta cochains and their b-analogues. The corresponding pairing formulae, with relative K-theory periods, trap information regarding the boundary and make allowance to derive geometric outcomes. As a spinoff, the authors exhibit that the generalized Atiyah-Patodi-Singer pairing brought by means of Getzler and Wu is inevitably constrained to nearly flat bundles

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Ej K) = − Tr(αE1 · . . · Ej K) = 0. 80). Now we can proceed as for a θ–summable Fredholm module. Following [GBVF01, p. 82) 2 2 Strq Dt , a0 e−σ0 Dt [Dt , a1 ] . . [Dt , ak ]e−σk Dt dσ, Δk with a0 , . . , ak ∈ b C ∞ (M◦ ). As in [Get93a, bottom of p. 7 and the fact that −∞ e−λ dλ = π, that this supercommutator equals a0,∂ , [D∂t , a1,∂ ], . . 83) . D∂ t It is important to note that here we are in the case q + 1, where the grading is the induced grading on the boundary and Eq+1 = −Γ . For convenience we will write D instead of Dt .

64) D =: d dx d 0 − dx +A , +A A is an ungraded Dirac type operator acting on the positive half spinor bundle restricted to the boundary. 66) d b k k−1 ˙ t ) + Bb/chk+1 (Dt , D ˙ t) Ch (Dt ) + bb/ ch (Dt , D dt 1 ˙ t ) ◦ i∗ . 2. q = −1. Now let D be ungraded and put D, α, E1 as in Eqs. 60). 67) Chk (Dt )(a0 , . . , ak ) = π b Chk (Dt )(a0 , . . , ak ), √ b k ˙ t )(a0 , . . , ak ) = π b/chk (Dt , D˙t )(a0 , . . , ak ). 69) 0 Γ D= Γ 0 d 0 + D∂ dx =:Γ D∂ . 70) 0 1 , −1 0 E1 = E2 = −Γ = 0 −Γ −Γ 0 .

Note that in this paper we use self-adjoint Dirac operators while Getzler uses skew-adjoint ones in [Get93a]. Accordingly, our Dirac operators differ by a factor −i from the Dirac operators in [Get93a]. This explains the appearance of such i-factors in our formulæ , which are not present in [Get93a]. 56) into its scalar and 1-form parts, using [Get93a, Lem. 57) A0 , · · · , Ak = k = b A0 , · · · , Ak − i b A0 , · · · , Aj , dt ∧ D˙ t , Aj+1 , · · · , Ak , j=0 one obtains Eqs. 53). 7, without using operator valued forms.

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