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We compute the $RO(C_2)$-graded Bredon cohomology of certain families of real and complex $C_2$-equivariant Grassmannians.

Algebraic Topology · Mathematics 2021-09-14 Eric Hogle

In these lectures I shall explain how a new-found nonabelian duality can be used to solve some outstanding questions in particle physics. The first lecture introduces the concept of electromagnetic duality and goes on to present its…

High Energy Physics - Theory · Physics 2007-05-23 ST Tsou

We construct and study a morphism of spectra implementing the Anderson duality of topological modular forms ($\mathrm{TMF}$). Its differential version will then be introduced, allowing us to pair elements of $\pi_d\mathrm{TMF}$ with spin…

Algebraic Topology · Mathematics 2025-07-01 Yuji Tachikawa , Mayuko Yamashita

We develop a general theory of higher semiadditive Fourier transforms that includes both the classical discrete Fourier transform for finite abelian groups at height $n=0$, as well as a certain duality for the $E_n$-(co)homology of…

Algebraic Topology · Mathematics 2022-11-29 Tobias Barthel , Shachar Carmeli , Tomer M. Schlank , Lior Yanovski

Since the 1974 paper by Peskine and Szpiro, liaison theory via complete intersections, and more generally via Gorenstein varieties, has become a standard tool kit in commutative algebra and algebraic geometry, allowing to compare algebraic…

Commutative Algebra · Mathematics 2024-12-18 Matteo Varbaro , Hongmiao Yu

The primary goal of this paper is to study Spanier-Whitehead duality in the $K(n)$-local category. One of the key players in the $K(n)$-local category is the Lubin-Tate spectrum $E_n$, whose homotopy groups classify deformations of a formal…

Algebraic Topology · Mathematics 2022-05-18 Agnès Beaudry , Paul G. Goerss , Michael J. Hopkins , Vesna Stojanoska

Let G be the p-adic group GL(n). Using C*-algebra techniques, we obtain a very explicit description of the tempered dual of G in terms of Bernstein parameters and extended quotients. We also prove that Plancherel measure (on the tempered…

Operator Algebras · Mathematics 2007-05-23 R. J. Plymen

We give minimal presentations for the $RO(C_2)$-graded Bredon cohomology of the equivariant classifying spaces $B_{C_2}U(n), B_{C_2}SO(n)$ and $B_{C_2}Sp(n)$ with coefficients in the rational Burnside Green functor $A_{\mathbf Q}$. This…

Algebraic Topology · Mathematics 2021-04-27 Nick Georgakopoulos

The $ER(2)$-cohomology of $B\mathbb{Z}/(2^q)$ and $\mathbb{C}P^n$ are computed along with the Atiyah-Hirzebruch spectral sequence for $ER(2)^*(\mathbb{C}P^\infty)$. This, along with other papers in this series, gives us the…

Algebraic Topology · Mathematics 2017-02-17 Nitu Kitchloo , Vitaly Lorman , W. Stephen Wilson

Dualities of resolving subcategories of finitely generated modules over Artin algebras are characterized as dualities with respect to Wakamatsu tilting bimodules. By restriction of these dualities to resolving subcategories of finitely…

Rings and Algebras · Mathematics 2024-11-20 Hongxing Chen , Jiangsheng Hu

We use the anti-equivalence between Cohen-Macaulay complexes and coherent sheaves on formal schemes to shed light on some older results and prove new results. We bring out the relations between a coherent sheaf M satisfying an S_2 condition…

Algebraic Geometry · Mathematics 2007-07-11 Suresh Nayak , Pramathanath Sastry

We describe relationships between integrable systems with N degrees of freedom arising from the AGT conjecture. Namely, we prove the equivalence (spectral duality) between the N-cite Heisenberg spin chain and a reduced gl(N) Gaudin model…

High Energy Physics - Theory · Physics 2015-06-04 A. Mironov , A. Morozov , Y. Zenkevich , A. Zotov

The nonequilibrium spectral properties of the Anderson impurity model with a chemical potential bias are investigated within a numerically exact real time quantum Monte Carlo formalism. The two-time correlation function is computed in a…

Strongly Correlated Electrons · Physics 2014-04-11 Guy Cohen , Emanuel Gull , David R. Reichman , Andrew J. Millis

The aim of this work is to study the dual and the algebraic dual of an evaluation code using standard monomials and indicator functions. We show that the dual of an evaluation code is the evaluation code of the algebraic dual. We develop an…

Commutative Algebra · Mathematics 2024-02-07 Hiram H. López , Ivan Soprunov , Rafael H. Villarreal

Let $G$ be a group and $S$ a unital epsilon-strongly $G$-graded algebra. We construct spectral sequences converging to the Hochschild (co)homology of $S$. Each spectral sequence is expressed in terms of the partial group (co)homology of $G$…

K-Theory and Homology · Mathematics 2025-07-23 Emmanuel Jerez

Let $R$ be a Cohen--Macaulay normal domain with a canonical module $\omega_R$. It is proved that if $R$ admits a noncommutative crepant resolution (NCCR), then necessarily it is $\mathbb{Q}$-Gorenstein. Writing $S$ for a Zariski local…

Representation Theory · Mathematics 2016-11-15 Hailong Dao , Osamu Iyama , Ryo Takahashi , Michael Wemyss

We are interested in computing the Bredon cohomology with coefficients in the constant Mackey functor $\underline{ \mathbb{F}_2}$ for equivariant $\text{Rep}(C_2)$ spaces, in particular for Grassmannian manifolds of the form…

Algebraic Topology · Mathematics 2025-03-14 Eric Hogle

We study the Poisson (co)homology of the algebra of truncated polynomials in two variables viewed as the semi-classical limit of a quantum complete intersection studied by Bergh and Erdmann. We show in particular that the Poisson cohomology…

K-Theory and Homology · Mathematics 2008-06-02 Stephane Launois , Lionel Richard

We explore the $C_2$-equivariant spectra $Tmf_1(3)$ and $TMF_1(3)$. In particular, we compute their $C_2$-equivariant Picard groups and the $C_2$-equivariant Anderson dual of $Tmf_1(3)$. This implies corresponding results for the fixed…

Algebraic Topology · Mathematics 2018-03-16 Michael A. Hill , Lennart Meier

We give some equivalent characterizations of $\mathcal{GP}$, the class of Gorenstein $(\mathcal{L}, \mathcal{A})$-projective modules, and construct some model structures associated to duality pairs and Frobenius pairs. Moreover, some rings…

Rings and Algebras · Mathematics 2021-08-03 Wenjing Chen , Ling Li , Yanping Rao