Tsygan's generalized Gerstenhaber formality conjecture for chains

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Let AA be an associative algebra. Write C(A,A)C^{\bullet}(A,A) for its Hochschild cochain complex and C(A,A)C_{\bullet}(A,A) for its Hochschild chain complex. For a Gerstenhaber algebra VV^{\bullet}, let V[ϵ]V^{\bullet}[\epsilon] be the odd-parameter deformation defined by

(a+ϵb)(c+ϵd)=ac+ϵ(bc+(1)aad+(1)a[a,c]),(a+\epsilon b)(c+\epsilon d)=ac+\epsilon\bigl(bc+(-1)^{|a|}ad+(-1)^{|a|}[a,c]\bigr), [a+ϵb,c+ϵd]=[a,c]+ϵ([b,c]+(1)a+1[a,d]).[a+\epsilon b,c+\epsilon d]=[a,c]+\epsilon\bigl([b,c]+(-1)^{|a|+1}[a,d]\bigr).

Tsygan's generalized Gerstenhaber formality conjecture. For any associative algebra AA, the Hochschild chain complex C(A,A)C_{\bullet}(A,A) is a GG_{\infty} module over the GG_{\infty} algebra C(A,A)[ϵ]C^{\bullet}(A,A)[\epsilon], and its underlying LL_{\infty}-module structure over C(A,A)C^{\bullet}(A,A) is given by the action of Hochschild cochains through the operators LDL_D. If this holds, then for a smooth manifold MM the Hochschild chains and differential forms acquire corresponding GG_{\infty}-module structures; the source gives no resolution status.

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Sources & referencesView supporting material

Primary source

Boris Tsygan, “Formality conjecture for chains”, arXiv:math/9904132 (1999).

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