Algebraic L-theory and topological manifolds by A. A. Ranicki

By A. A. Ranicki

This publication offers the definitive account of the functions of this algebra to the surgical procedure class of topological manifolds. The crucial result's the id of a manifold constitution within the homotopy kind of a Poincaré duality house with an area quadratic constitution within the chain homotopy form of the common conceal. the variation among the homotopy varieties of manifolds and Poincaré duality areas is pointed out with the fibre of the algebraic L-theory meeting map, which passes from neighborhood to international quadratic duality constructions on chain complexes. The algebraic L-theory meeting map is used to offer a in basic terms algebraic formula of the Novikov conjectures at the homotopy invariance of the better signatures; the other formula inevitably components via this one.

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It should be pointed out that the Mathai-Quillen construction for this twist was already contained, yet not explicitly constructed, in [100], and was also studied in the context of “balanced” topological field theories by Dijkgraaf and Moore in [25], while the basic structure had already been discussed from the viewpoint of supersymmetric quantum mechanics by Blau and Thompson in [12]. Recently, the Mathai-Quillen formalism has been applied to the twist under consideration in [102]. The construction presented in that work differs from ours in the role assigned to the field C.

What is its role in this game? In fact, the theory admits two Mathai-Quillen descriptions, related to each other by the Weyl group of SU(2)F , in such a way that the roles of Q+ and Q− are interchanged, as are the roles of ψ and χ, ˜ χ+ and ¯ The corresponding moduli space is defined by eqs. 28) with ψ˜+ , ζ and η, and φ and φ. the substitution C → −C, and the theory localizes – as was proved in [100] – actually on the intersection of both moduli spaces, which is defined by the equations Dµ C = 0, + D ν Bνµ = 0, + + Fµν − 2i [Bµτ , B +τν ] = 0, + [Bµν , C] = 0.

26). And what about Q− ? What is its role in this game? In fact, the theory admits two Mathai-Quillen descriptions, related to each other by the Weyl group of SU(2)F , in such a way that the roles of Q+ and Q− are interchanged, as are the roles of ψ and χ, ˜ χ+ and ¯ The corresponding moduli space is defined by eqs. 28) with ψ˜+ , ζ and η, and φ and φ. the substitution C → −C, and the theory localizes – as was proved in [100] – actually on the intersection of both moduli spaces, which is defined by the equations Dµ C = 0, + D ν Bνµ = 0, + + Fµν − 2i [Bµτ , B +τν ] = 0, + [Bµν , C] = 0.

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