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Topological Hochschild homology (THH) is an invariant of ring spectra developed by B\"okstedt. In recent years many equivariant analogues to THH have emerged. One example is twisted THH which is an invariant of $C_n$-equivariant ring…

Algebraic Topology · Mathematics 2026-02-03 Danika Van Niel

In this paper, we construct a Real equivariant version of the B\"okstedt spectral sequence which takes inputs in the theory of Real Hochschild homology developed by Angelini-Knoll, Gerhardt, and Hill and converges to the equivariant…

Algebraic Topology · Mathematics 2024-08-15 Chloe Lewis

We compute topological Hochschild homology of sufficiently structured forms of truncated Brown--Peterson spectra with coefficients. In particular, we compute $\mathrm{THH}_*(B\langle n\rangle ;H\mathbb{Z}_{(p)})$ for all $n$ and…

Algebraic Topology · Mathematics 2024-08-28 Gabriel Angelini-Knoll , Dominic Leon Culver , Eva Höning

The topological Hochschild homology of a ring (or ring spectrum) $R$ is an $S^1$-spectrum, and the fixed points of THH($R$) for subgroups $C_n\subset S^1$ have been widely studied due to their use in algebraic K-theory computations.…

Algebraic Topology · Mathematics 2025-04-17 Anna Marie Bohmann , Teena Gerhardt , Cameron Krulewski , Sarah Petersen , Lucy Yang

We generalize a spectral sequence of Brun for the computation of topological Hochschild homology. The generalized version computes the $E$-homology of $THH(A;B)$, where $E$ is a ring spectrum, $A$ is a commutative $S$-algebra and $B$ is a…

Algebraic Topology · Mathematics 2020-04-29 Eva Höning

Topological Hochschild homology is a topological analogue of classical Hochschild homology of algebras and bimodules. Beliakova, Putyra, and Wehrli introduced quantum Hochschild homology (qHH) and used it to define a quantization of annular…

Geometric Topology · Mathematics 2025-12-01 Rostislav Akhmechet , Teena Gerhardt , Michael Willis

In recent work, Hess and Shipley defined a theory of topological coHochschild homology (coTHH) for coalgebras. In this paper we develop computational tools to study this new theory. In particular, we prove a Hochschild-Kostant-Rosenberg…

Algebraic Topology · Mathematics 2023-03-15 Anna Marie Bohmann , Teena Gerhardt , Amalie Høgenhaven , Brooke Shipley , Stephanie Ziegenhagen

Hess and Shipley defined an invariant of coalgebra spectra called topological coHochschild homology, and Bohmann-Gerhardt-H{\o}genhaven-Shipley-Ziegenhagen developed a coB\"okstedt spectral sequence to compute the homology of coTHH for…

Algebraic Topology · Mathematics 2021-08-19 Sarah Klanderman

In this article, we study the topological Hochschild homology of $\mathbf{E}_3$-forms of truncated Brown-Peterson spectra, taken relative to certain Thom spectra $X(p^n)$ (introduced by Ravenel and used by Devinatz-Hopkins-Smith in the…

Algebraic Topology · Mathematics 2023-03-31 Sanath K Devalapurkar

We show the topological Hochschild homology spectrum of a twisted group algebra $\THH(A^{\tau}[G])$ is the Thom spectrum associated to a parametrized orthogonal spectrum $E(A,G)$. We then analyze the structure of the parametrized orthogonal…

Algebraic Topology · Mathematics 2007-05-23 Daniel J. Vera

We define twisted Hochschild homology for Green functors. This construction is the algebraic analogue of the relative topological Hochschild homology $THH_{C_n}(-)$, and it describes the $E_2$ term of the K\"unneth spectral sequence for…

Algebraic Topology · Mathematics 2020-01-01 Andrew J. Blumberg , Teena Gerhardt , Michael A. Hill , Tyler Lawson

In this paper, we study genuine equivariant factorization homology and its interaction with equivariant Thom spectra, which we construct using the language of parametrized higher category theory. We describe the genuine equivariant…

Algebraic Topology · Mathematics 2024-02-06 Jeremy Hahn , Asaf Horev , Inbar Klang , Dylan Wilson , Foling Zou

We describe a construction of the cyclotomic structure on topological Hochschild homology ($THH$) of a ring spectrum using the Hill-Hopkins-Ravenel multiplicative norm. Our analysis takes place entirely in the category of equivariant…

K-Theory and Homology · Mathematics 2016-10-04 V. Angeltveit , A. Blumberg , T. Gerhardt , M. Hill , T. Lawson , M. Mandell

We compute topological Hochschild homology of $\mathbb{E}_3$-MU-algebra forms of the second truncated Brown-Peterson spectrum with Adams summand coefficients at $p=2$ and conditionally at arbitrary primes. We also provide a new…

Algebraic Topology · Mathematics 2026-03-13 Gabriel Angelini-Knoll , Maxime Chaminadour

We identify the topological Hochschild homology (THH) of the Thom spectrum associated to an E_\infty classifying map X -> BG, for G an appropriate group or monoid (e.g. U, O, and F). We deduce the comparison from the observation of McClure,…

Algebraic Topology · Mathematics 2008-11-06 Andrew J. Blumberg

We discuss spectral sequences coming from Whitehead filtrations in the computation of topological Hochschild homology of ring spectra. Using cyclic invariance, this makes for simple computations of $THH$ of connective rings $R$ with…

Algebraic Topology · Mathematics 2025-07-23 Logan Hyslop

The topological Hochschild homology $THH(A)$ of an orthogonal ring spectrum $A$ can be defined by evaluating the cyclic bar construction on $A$ or by applying B\"okstedt's original definition of $THH$ to $A$. In this paper, we construct a…

Algebraic Topology · Mathematics 2019-06-20 Emanuele Dotto , Cary Malkiewich , Irakli Patchkoria , Steffen Sagave , Calvin Woo

We develop a new spectral sequence in order to calculate Hochschild homology of smash biproducts (also called twisted tensor products) of unital associative algebras $A\# B$ provided one of $A$ or $B$ has Hochschild dimension less than 2.…

K-Theory and Homology · Mathematics 2018-09-28 Atabey Kaygun , Serkan Sütlü

We compute endomorphisms of topological Hochschild homology ($\mathrm{THH}$) as a functor on stable $\infty$-categories, as well as variants thereof: we also compute endomorphisms of the $k$-linear Hochschild homology functor…

Algebraic Topology · Mathematics 2025-03-07 Maxime Ramzi

We extend Ravenel-Wilson Hopf ring techniques to $C_2$-equivariant homotopy theory. Our main application and motivation is a computation of the $RO(C_2)$-graded homology of $C_2$-equivariant Eilenberg-MacLane spaces. The result we obtain…

Algebraic Topology · Mathematics 2024-12-25 Sarah Petersen
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