Посилання:Twisted Cyclic Cohomology and Modular Fredholm Modules / A. Rennie, A. Sitarz, M. Yamashita // Symmetry, Integrability and Geometry: Methods and Applications. — 2013. — Т. 9. — Бібліогр.: 21 назв. — англ.
Підтримка:AR was supported by the Australian Research Council, and thanks Jens Kaad for numerous
discussions on related topics. MY was supported in part by the ERC Advanced Grant 227458
OACFT “Operator Algebras and Conformal Field Theory”. AS acknowledges support of MNII
grant 189/6.PRUE/2007/7 and thanks for the warm hospitality at Mathematical Sciences Institute, Australian National University, Canberra.
Connes and Cuntz showed in [Comm. Math. Phys. 114 (1988), 515-526] that suitable cyclic cocycles can be represented as Chern characters of finitely summable semifinite Fredholm modules. We show an analogous result in twisted cyclic cohomology using Chern characters of modular Fredholm modules. We present examples of modular Fredholm modules arising from Podleś spheres and from SUq(2).