期刊论文详细信息
Journal of noncommutative geometry
Cyclic cocycles in the spectral action
article
Teun D. H. van Nuland1  Walter D. van Suijlekom1 
[1] Radboud University
关键词: Noncommutative differential geometry;    entire cyclic cocycles;    spectral action principle;    Yang–Mills;    Chern–Simons;    multiple operator integrals;   
DOI  :  10.4171/jncg/500
学科分类:神经科学
来源: European Mathematical Society
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【 摘 要 】

We show that the spectral action, when perturbed by a gauge potential, can be written as a series of Chern–Simons actions and Yang–Mills actions of all orders. In the odd orders, generalized Chern–Simons forms are integrated against an odd (b,B)(b,B)(b,B)-cocycle, whereas, in the even orders, powers of the curvature are integrated against (b,B)(b,B)(b,B)-cocycles that are Hochschild cocycles as well. In both cases, the Hochschild cochains are derived from the Taylor series expansion of the spectral action Tr⁡(f(D+V))\operatorname{Tr}(f(D+V))Tr(f(D+V)) in powers of V=πD(A)V=\pi_D(A)V=πD​(A), but unlike the Taylor expansion we expand in increasing order of the forms in AAA. This extends the work of Connes and Chamseddine (2006), which computes only the scale-invariant part of the spectral action, works in dimension at most 4, and assumes the vanishing tadpole hypothesis. In our situation, we obtain a truly infinite odd (b,B)(b,B)(b,B)-cocycle. The analysis involved draws from recent results in multiple operator integration, which also allows us to give conditions under which this cocycle is entire, and under which our expansion is absolutely convergent. As a consequence of our expansion and of the gauge invariance of the spectral action, we show that the odd (b,B)(b,B)(b,B)-cocycle pairs trivially with K1K_1K1​.

【 授权许可】

CC BY   

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