Abstract
This paper is based on lectures given at the Vietnamese Institute for Advanced Studies in Mathematics and aims to present the theory of higher Hochschild (co)homology and its application to higher string topology. There is an emphasis on explicit combinatorial models provided by simplicial sets to describe derived structures carried or described by Higher Hochschild (co)homology functors. It contains detailed proofs of results stated in a previous note as well as some new results. One of the main result is a proof that string topology for higher spheres inherits a Hodge filtration compatible with an (homotopy) E n+1-algebra structure on the chains for d-connected Poincaré duality spaces. We also prove that the E n -centralizer of maps of commutative (dg-)algebras are equipped with a Hodge decomposition and a compatible structure of framed E n -algebras. We also study Hodge decompositions for suspensions and products by spheres, both as derived functors and combinatorially.
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Notes
- 1.
- 2.
- 3.
- 4.
Also called chiral homology, an homology theory for n-dimensional framed manifold and E n -algebras.
- 5.
In fact, this paper (and the concomitant lectures) were partially thought as an introduction to ideas and features of factorization homology in a special case of independent interest but which does not require as much higher homotopical background as the general theory.
- 6.
Also called Pois 2-algebras in this paper.
- 7.
- 8.
Said otherwise it has an additional action of the orthogonal group O(d) for which the structure maps are equivariant.
- 9.
That is the dg-structure on \(M \otimes \bigotimes _{i\in I_{+}\setminus \{+\}}A\) is the tensor product of the underlying dg-k-modules.
- 10.
Here the commutativity is crucial.
- 11.
Recall that we can consider normalized chains and cochains when applying Dold-Kan.
- 12.
That is a commutative algebra object in the symmetric monoidal category of differential graded A-modules.
- 13.
Meaning that the A-module structure is induced from the \({CH}_{X_{\bullet }}(A)\) one through the algebra map \(A \rightarrow {CH}_{X_{\bullet }}(A)\).
- 14.
Said otherwise, the combinatorial definition of Hochschild chains has an natural derived enhancement.
- 15.
Using the now standard terminology of calling homology an object of an ∞-derived category of complexes, not to be mistaken with their associated homology groups.
- 16.
Which are actually k-modules.
- 17.
For its standard monoidal structure given by tensoring over A.
- 18.
Sometimes called E n -bimodules since for n = 1, they correspond to homotopy bimodules over an homotopy associative algebra.
- 19.
And thus realizing R(D k −1).
- 20.
That is π d (f k , ∗)(1) = k.
- 21.
See Remark 1.3.21, this is the filtration induced by the simplicial degree.
- 22.
See Definition 1.4.1.
- 23.
- 24.
In other words a functor from Mod CDGA to (γ, 0) − (Mod CDGA ).
- 25.
In other words the quasi-isomorphism from \({CH}^{X_{\bullet }}(A,B) \otimes {CH}^{Y _{\bullet }}(A,B)\) to the chain complex associated to the diagonal cosimplicial space \(\big({CH}^{X_{n}}(A,B) \otimes {CH}^{Y _{n}}(A,B)\big)_{n\in \mathbb{N}}\).
- 26.
By a diagonal sphere, we mean a component indexed by a tuple for which all the j i are the same. Which are precisely those on the diagonal cubes in Fig. 1.3.
- 27.
That is continuous maps which are embeddings, which, restricted to each cube is obtained by a translation and an homothety in each of the nth direction of the cube I n.
- 28.
In other words, \(\mathbf{CH}^{S^{d} }(-,-)\) is a functor CDGA(Mod CDGA ) → E n -Alg(k- Mod).
- 29.
In particular of E n -algebra in cochain complexes.
- 30.
Instead of rectangles parallel to the axes.
- 31.
- 32.
A disk is open here.
- 33.
Any A is quasi-isomorphic to a semi-free one of the form (Sym(V ), d) and by quasi-invariance of Hochschild chains it is enough to compute the left hand side of (1.93) for the later cdgas.
- 34.
We recall that it means that f is quasi-isomorphic to H ∗(f): H ∗(Y ) → H ∗(X) in CDGA; in particular X and Y are formal.
- 35.
It can also be deduced from the fact that Sym is a left adjoint hence commutes with colimits.
- 36.
Note that Sym(V ) is endowed with the zero differential.
- 37.
That is those not of the form ℓd + σ ℓ −1(1), …, ℓd + σ ℓ −1(d).
- 38.
For the Lie algebroid \(\Omega ^{1}(R)[1 - n]\) deduced from the Lie algebra structure on R[1 − n].
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Ginot, G. (2017). Hodge Filtration and Operations in Higher Hochschild (Co)homology and Applications to Higher String Topology. In: Nguyễn, H., Schwartz, L. (eds) Algebraic Topology. Lecture Notes in Mathematics, vol 2194. Springer, Cham. https://doi.org/10.1007/978-3-319-69434-4_1
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