D. Kaledin
Gabber's Theorem claims that the singular support of a D-module is involutive. We show how to give a conceptually clear proof of this in the context of Hochschild Homology and Cohomology of abelian categories.
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We investigate Hochschild cohomology and homology of admissible subcategories of derived categories of coherent sheaves on smooth projective varieties. We show that the Hochschild cohomology of an admissible subcategory is isomorphic to the derived endomorphisms of the kernel giving the corresponding projection functor, and the Hochschild homology is isomorphic to derived morphisms from this kernel to its convolution with the kernel of the Serre functor. We investigate some basic properties of Hochschild homology and cohomology of admissible subcategories. In particular, we check that the Hoch…
Logarithmic Hochschild (co)homology of logarithmic orbifolds
本文研究了logarithmic orbifolds的logarithmic Hochschild (co)homology，扩展了分解定理并探讨了对称积和根堆栈操作下的不变性。
Hochschild homology for log schemes
将Hochschild同调和循环同调推广到代数空间到代数栈的态射，进而得到Fontaine-Illusie意义下对数方案的这些同调理论。
We introduce Hochschild (co-)homology of morphisms of schemes or analytic spaces and study its fundamental properties. In analogy with the cotangent complex we introduce the so called (derived) Hochschild complex of a morphism; the Hochschild cohomology and homology groups are then the Ext and Tor groups of that complex. We prove that these objects are well defined, extend the known cases, and have the expected functorial and homological properties such as graded commutativity of Hochschild cohomology and existence of the characteristic homomorphism from Hochschild cohomology to the (graded) c…
A decomposition theorem for the Hochschild homology of symmetric powers of a dg category
本文证明了关于对称幂的dg范畴Hochschild上同调的分解定理，揭示了其结构与原始范畴的上同调之间的关系。
On the map induced on Hochschild homology of matrix factorization categories by the inclusion of a divisor
本文利用Hochschild-Kostant-Rosenberg同构，计算了光滑除子包含映射的前推函子在矩阵分解范畴的Hochschild同调上诱导的映射。
Logarithmic Hochschild co/homology via formality of derived intersections
该研究定义了适用于简单正规交叉对、环面奇点等情形的对数概形对数Hochschild上同调/同调，证明相关同构与不变性，借助导出相交形式化与乘积热带化结论构建了该理论的几何研究方法。
We perform Hochschild homology calculations in the algebro-geometric setting of motives. The motivic Hochschild homology coefficient ring contains torsion classes which arise from the mod-$p$ motivic Steenrod algebra and from generating functions on the natural numbers with finite non-empty support. Under the Betti realization, we recover Bökstedt's calculation of the topological Hochschild homology of finite prime fields.
Given a $k$--scheme $X$ that admits a tilting object $T$, we prove that the Hochschild (co-)homology of $X$ is isomorphic to that of $A= End_{X}(T)$. We treat more generally the relative case when $X$ is flat over an affine scheme $Y=\Spec R$ and the tilting object satisfies an appropriate Tor-independence condition over $R$. Among applications, Hochschild homology of $X$ over $Y$ is seen to vanish in negative degrees, smoothness of $X$ over $Y$ is shown to be equivalent to that of $A$ over $R$, and for $X$ a smooth projective scheme we obtain that Hochschild homology is concentrated in degree…
We consider derived invariants of varieties in positive characteristic arising from topological Hochschild homology. Using theory developed by Ekedahl and Illusie-Raynaud in their study of the slope spectral sequence, we examine the behavior under derived equivalences of various $p$-adic quantities related to Hodge-Witt and crystalline cohomology groups, including slope numbers, domino numbers, and Hodge-Witt numbers. As a consequence, we obtain restrictions on the Hodge numbers of derived equivalent varieties, partially extending results of Popa-Schell to positive characteristic.
A Hochschild-Kostant-Rosenberg theorem and residue sequences for logarithmic Hochschild homology
本文将Hochschild同调纳入对数动机研究框架，定义导出前对数环的对数Hochschild同调，构造André-Quillen型谱序列，证明对数Hochschild-Kostant-Rosenberg定理及该同调在对数动机范畴可表示，还推导出涉及对数概形爆破的广义留数序列。
An important step in the calculation of the triply graded link homology theory of Khovanov and Rozansky is the determination of the Hochschild homology of Soergel bimodules for SL(n). We present a geometric model for this Hochschild homology for any simple group G, as equivariant intersection homology of B x B-orbit closures in G. We show that, in type A these orbit closures are equivariantly formal for the conjugation T-action. We use this fact to show that in the case where the corresponding orbit closure is smooth, this Hochschild homology is an exterior algebra over a polynomial ring on ge…
A filtered Hochschild-Kostant-Rosenberg theorem for real Hochschild homology
本文在$ C_2 $-Mackey函子中引入导出对合代数，证明其实Hochschild同调存在滤过且相关分次等同对合de Rham复形，并特化为Raksit的HKR-滤过Hochschild同调。
A procedure for constructing bivariant theories by means of Grothendieck duality is developed. This produces, in particular, a bivariant theory of Hochschild (co)homology on the category of schemes that are flat, separated and essentially of finite type over a fixed noetherian scheme S. The theory takes values in the category of symmetric graded modules over the graded-commutative ring \oplus_i H^i(S,O_S). In degree i, the cohomology and homology H^0(S,O_S)-modules thereby associated to such an x: X -> S, with Hochschild complex H_x, are Ext^i(H_x, H_x) and Ext^{-i}(H_x, x^!O_S). This lays the…
On endomorphisms of topological Hochschild homology
本文计算了稳定∞-范畴上拓扑Hochschild同调（THH）函子及其变体（包括HH_k和稳定对称幺半范畴上的THH）的自同态。
We present a detailed computation of the cyclic and the Hochschild homology and cohomology of generic and 3-Calabi-Yau homogeneous down-up algebras. This family was defined by Benkart and Roby in their study of differential posets. Our calculations are completely explicit, by making use of the Koszul bimodule resolution and arguments similar to those used by the second and third authors for Yang-Mills algebras.
The goal of this paper is to establish fundamental properties of the Hochschild, topological Hochschild, and topological cyclic homologies of commutative, Noetherian rings, which are assumed only to be F-finite in the majority of our results. This mild hypothesis is satisfied in all cases of interest in finite and mixed characteristic algebraic geometry. We prove firstly that the topological Hochschild homology groups, and the homotopy groups of the fixed point spectra $TR^r$, are finitely generated modules. We use this to establish the continuity of these homology theories for any given ideal…
We define and study the Hochschild (co)homology of the second kind (known also as the Borel-Moore Hochschild homology and the compactly supported Hochschild cohomology) for curved DG-categories. An isomorphism between the Hochschild (co)homology of the second kind of a CDG-category B and the same of the DG-category C of right CDG-modules over B, projective and finitely generated as graded B-modules, is constructed. Sufficient conditions for an isomorphism of the two kinds of Hochschild (co)homology of a DG-category are formulated in terms of the two kinds of derived categories of DG-modules ov…
We give an account of the construction of the Bhatt--Morrow--Scholze motivic filtration on topological cyclic homology and related invariants, focusing on the case of equal characteristic $p$ and the connections to crystalline and de Rham--Witt theory.
Real Topological Hochschild Homology of Perfectoid Rings
本文将Bhatt-Morrow-Scholze关于THH的结果推广到THR，计算了完美胚环的THR，并给出HKR定理的实精细化，为在准辛同伦环上建立动机滤过提供工具。
We identify the equivariant structure of the filtered pieces of the motivic filtration defined by Bhatt, Morrow and Scholze on the topological Hochschild cohomology spectrum of polynomial algebras over $\mathbb{F}_p$.
Fourier--Mukai equivalences for formal groups and elliptic Hochschild homology
本文比较两种椭圆 Hochschild 同调定义，提出形式群的新 Fourier--Mukai 对偶性以统一扭曲 Hochschild 同调，并引入全局版本暗示了普遍的 TMF-Hochschild 同调形式。
We define the notion of a trace kernel on a manifold M. Roughly speaking, it is a sheaf on M x M for which the formalism of Hochschild homology applies. We associate a microlocal Euler class to such a kernel, a cohomology class with values in the relative dualizing complex of the cotangent bundle over M and we prove that this class is functorial with respect to the composition of kernels. This generalizes, unifies and simplifies various results of (relative) index theorems for constructible sheaves, D-modules and elliptic pairs.
We study the behavior of cohomological support loci of the canonical bundle under derived equivalence of smooth projective varieties. This is achieved by investigating the derived invariance of a generalized version of Hochschild homology. Furthermore, using techniques coming from birational geometry, we establish the derived invariance of the Albanese dimension for varieties having non-negative Kodaira dimension. We apply our machinery to study the derived invariance of the holomorphic Euler characteristic and of certain Hodge numbers for special classes of varieties. Further applications con…
Real topological Hochschild homology of schemes
该研究证明带对合概形的实拓扑Hochschild同调THR满足基变换与Z/2等变平展拓扑下降性质，并给出射影直线及高维射影空间的相关计算，为相关同调理论研究提供了新结果。
Hochschild and cyclic Homologies with bounded poles
本文通过为模对构造Hochschild与循环同调，证明了其在带模动机范畴中的可表示性，并建立了模版HKR定理及模循环同调的可表示性。
We give a short proof of Kaledin's theorem on the degeneration of the noncommutative Hodge-to-de Rham spectral sequence. Our approach is based on topological Hochschild homology and the theory of cyclotomic spectra. As a consequence, we also obtain relative versions of the degeneration theorem, both in characteristic zero and for regular bases in characteristic $p$.
We generalize the decomposition theorem of Hochschild, Kostant and Rosenberg for Hochschild (co-)homology to arbitrary morphisms between complex spaces or schemes over a field of characteristic zero. To be precise, we show that for each such morphism, the Hochschild complex, as introduced in math.AG/0606593, decomposes naturally in the derived category into the direct sum of the derived symmetric powers of the shifted cotangent complex, a result due to Quillen in the affine case. Even in the affine case, our proof is new and provides further information. It shows that the decomposition is give…
We develop the Hochschild analogue of the coniveau spectral sequence and the Gersten complex. Since Hochschild homology does not have devissage or A^1-invariance, this is a little different from the K-theory story. In fact, the rows of our spectral sequence look a lot like the Cousin complexes in Hartshorne's 1966 "Residues & Duality". Note that these are for coherent cohomology. We prove that they agree by an 'HKR isomorphism with supports'. Using the close ties of Hochschild homology to Lie algebra homology, this gives residue maps in Lie homology, which we show to agree with those à la Tate…
The Hochschild homology of a noncommutative symmetric quotient stack
本文研究了非交换对称商堆栈的Hochschild上同调，通过显式构造同伦等价证明其同构于对称代数，并赋予Heisenberg代数、Hopf代数及自由λ-环结构。
In this paper we prove that for an affine scheme essentially of finite type over a field $F$ and of dimension $d$, $K_{d+1}$-regularity implies regularity, assuming that the characteristic of $F$ is zero. This verifies a conjecture of Vorst.
Hochschild homology and the derived de Rham complex revisited
本文通过普遍性质重新审视Hochschild同调与导出de Rham复形的关系，证明了HKR滤层的关联graded与导出de Rham复形相等，并给出了新的构造方法。
Let $X$ be a smooth proper scheme over a field of characteristic 0. Following D. Shklyarov [10], we construct a (non-degenerate) pairing on the Hochschild homology of $\per{X}$, and hence, on the Hochschild homology of $X$. On the other hand the Hochschild homology of $X$ also has the Mukai pairing (see [1]). If $X$ is Calabi-Yau, this pairing arises from the action of the class of a genus 0 Riemann-surface with two incoming closed boundaries and no outgoing boundary in $\text{H}_{0}({\mathcal M}_0(2,0))$ on the algebra of closed states of a version of the B-Model on $X$. We show that these pa…
Given a nontrivial semi-orthogonal decomposition $\Perf(\X)=\langle \mathcal{A},\mathcal{B}\rangle$, and assume that the base locus of $ω_{\X}$ is a proper closed subset, it was proved by Kotaro Kawatani and Shinnosuke Okawa that all skyscraper sheaves $\k(\x)$ with $\x\notin \mathsf{Bs}\vert ω_{\X}\vert$ belong to exactly one and only one of the components. It is natural to ask which one it is, and whether we can determine this by certain linear invariants. In this note we use Hochschild homology of derived category of coherent sheaves with support to provide another proof that if the $-\n^þ$…
Hochschild (Co)homology of D-modules on rigid analytic spaces I
本文提出D-帽模在刚性解析空间上的Hochschild (co)同调理论，通过显式计算和同构证明，建立了Hodge-de Rham谱序列及与de Rham复形的关联。
The $K$-theory of a polynomial ring $R[t]$ contains the $K$-theory of $R$ as a summand. For $R$ commutative and containing $\Q$, we describe $K_*(R[t])/K_*(R)$ in terms of Hochschild homology and the cohomology of Kähler differentials for the $cdh$ topology. We use this to address Bass' question, on whether $K_n(R)=K_n(R[t])$ implies $K_n(R)=K_n(R[t_1,t_2])$. The answer is positive over fields of infinite transcendence degree; the companion paper arXiv:1004.3829 provides a counterexample over a number field.
Motivic real topological Hochschild spectrum
定义带对合的分离对数方案的实拓扑Hochschild同调，证明其(ℙⁿ,ℙⁿ⁻¹)-不变性，从而构造动机实拓扑Hochschild谱，并探讨其性质及动机实拓扑循环谱。
Finite group actions on dg categories and Hochschild homology
研究微分分次范畴上有限群作用的等变微分分次范畴的霍赫希尔德同调群分解，揭示基域特定时该分解与范畴作用、表示环作用的关联。
Prismatic logarithm and prismatic Hochschild homology via norm
本文借助 Sulyma 的棱柱范数精细化棱柱对数，初等构造线丛上 Hodge–Tate 晶体的第一陈类，并提出棱柱 Hochschild 同调作为非交换类比。
The Heisenberg algebra of a vector space and Hochschild homology
本文针对非交换光滑真簇，在对称商层的总霍奇同调上构造海森伯代数的三个等价作用，还为普通交换簇给出基于对应关系的第四个几何描述。
We first review various known algebraic structures on the Hochschild (co)homology of a differential graded algebras under weak Poincar{é} duality hypothesis, such as Calabi-Yau algebras, derived Poincar{é} duality algebras and closed Frobenius algebras. This includes a BV-algebra structure on $HH^*(A,A^\vee)$ or $HH^*(A,A)$, which in the latter case is an extension of the natural Gerstenhaber structure on $HH^*(A,A)$. As an example, after proving that the chain complex of the Moore loop space of a manifold $M$ is a CY-algebra and using Burghelea-Fiedorowicz-Goodwillie theorem we obtain a BV-st…
Noncommutative relative de Rham--Witt complex via the norm
该研究引入相对霍赫希尔德-维特同调，统一了德拉姆-维特复形的相对与非交换两种推广，证明其HKR定理并建立与相对德拉姆-维特复形的关联，还补全了Kaledin相关研究的缺失部分。
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