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We give necessary and sufficient conditions for stratification and costratification to descend along a coproduct preserving, tensor-exact $R$-linear functor between $R$-linear tensor-triangulated categories which are rigidly-compactly…

Category Theory · Mathematics 2022-05-12 Liran Shaul , Jordan Williamson

We classify Lagrangian subcategories of the representation category of a twisted quantum double of a finite group. In view of results of 0704.0195v2 this gives a complete description of all braided tensor equivalent pairs of twisted quantum…

Quantum Algebra · Mathematics 2009-11-13 Deepak Naidu , Dmitri Nikshych

We revisit the classical constructions of tensor-triangular geometry in the setting of stably symmetric monoidal idempotent-complete $\infty$-categories, henceforth referred to as 2-rings. In this setting, we produce a Zariski topology, a…

Algebraic Geometry · Mathematics 2025-08-18 Ko Aoki , Tobias Barthel , Anish Chedalavada , Tomer Schlank , Greg Stevenson

We investigate to what extent we can descend the classification of localizing, smashing and thick ideals in a presentably symmetric monoidal stable $\infty$-category $\mathscr{C}$ along a descendable commutative algebra $A$. We establish…

Category Theory · Mathematics 2023-05-04 Tobias Barthel , Natalia Castellana , Drew Heard , Niko Naumann , Luca Pol , Beren Sanders

We consider the derived category of permutation modules for a finite group, in positive characteristic. We stratify this tensor triangulated category using Brauer quotients. We describe the spectrum of its compact objects, by reducing the…

Representation Theory · Mathematics 2025-07-22 Paul Balmer , Martin Gallauer

We give a definition of the action of a tensor triangulated category T on a triangulated category K. In the case that T is rigidly-compactly generated and K is compactly generated we show this gives rise to a notion of supports which…

Category Theory · Mathematics 2012-05-23 Greg Stevenson

Representations of small quantum groups $u_q({\mathfrak{g}})$ at a root of unity and their extensions provide interesting tensor categories, that appear in different areas of algebra and mathematical physics. There is an ansatz by Lusztig…

Quantum Algebra · Mathematics 2017-09-26 Simon Lentner , Tobias Ohrmann

This paper surveys some recent results, concerning the intrinsicness of natural subcategories of weakly approximable triangulated categories. We also review the results about uniqueness of enhancements of triangulated categories, with the…

Algebraic Geometry · Mathematics 2024-12-31 Alberto Canonaco , Amnon Neeman , Paolo Stellari

In this paper, we study geometric points in tensor triangular geometry. In doing so, we construct a counter-example to Balmer's Nerves of Steel conjecture using free constructions in higher Zariski geometry. We then go on to introduce and…

Algebraic Topology · Mathematics 2026-03-27 Tobias Barthel , Logan Hyslop , Maxime Ramzi

We prove that a finite braided tensor category A is invertible in the Morita 4-category BrTens of braided tensor categories if, and only if, it is non-degenerate. This includes the case of semisimple modular tensor categories, but also…

Quantum Algebra · Mathematics 2021-08-25 Adrien Brochier , David Jordan , Pavel Safronov , Noah Snyder

We systematically develop a theory of stratification in the context of tensor triangular geometry and apply it to classify the localizing tensor-ideals of certain categories of spectral $G$-Mackey functors for all finite groups $G$. Our…

Algebraic Topology · Mathematics 2023-10-02 Tobias Barthel , Drew Heard , Beren Sanders

We obtain, via the formalism of tensor actions, a complete classification of the localizing subcategories of the stable derived category of any affine scheme with hypersurface singularities and of any local complete intersection over a…

Algebraic Geometry · Mathematics 2014-03-19 Greg Stevenson

In his proof of the K(pi,1) conjecture for complex reflection arrangements, Bessis defined Garside categories suitable for studying braid groups of centralizers of Springer regular elements in well-generated complex reflection groups. We…

Group Theory · Mathematics 2026-02-13 Owen Garnier

We classify complactly generated t-structures on the derived category of modules over a commutative Noetherian ring R in terms of decreasing filtrations by supports on Spec(R). A decreasing filtration by supports \phi : Z -> Spec(R)…

Algebraic Geometry · Mathematics 2017-04-27 Leovigildo Alonso , Ana Jeremias , Manuel Saorin

We study the derived categories of small categories over commutative noetherian rings. Our main result is a parametrization of the localizing subcategories in terms of the spectrum of the ring and the localizing subcategories over residue…

Representation Theory · Mathematics 2016-06-22 Benjamin Antieau , Greg Stevenson

We extend the analysis of Balmer and Gallauer on the tt-geometry of the small derived category of permutation modules for a finite group over a field to the setting of a commutative Noetherian base. In this general context, we provide a…

Representation Theory · Mathematics 2025-07-09 Umesh V Dubey , Juan Omar Gómez

Let V be a simple vertex operator algebra satisfying the following conditions: (i) The homogeneous subspaces of V of weights less than 0 are 0, the homogeneous subspace of V of weight 0 is spanned by the vacuum and V' is isomorphic to V as…

Quantum Algebra · Mathematics 2007-12-22 Yi-Zhi Huang

Given a tensor-triangulated category $T$, we prove that every flat tensor-idempotent in the module category over $T^c$ (the compacts) comes from a unique smashing ideal in $T$. We deduce that the lattice of smashing ideals forms a frame.

Category Theory · Mathematics 2024-09-10 Paul Balmer , Henning Krause , Greg Stevenson

For a point $\mathfrak{p}$ in the spectrum of the cohomology ring of a finite group $G$ over a field $k$, we calculate the spectrum for the subcategory of dualisable objects inside the tensor triangulated category of $\mathfrak{p}$-local…

Representation Theory · Mathematics 2025-05-27 Dave Benson , Srikanth B. Iyengar , Henning Krause , Julia Pevtsova

We discuss dualisable objects in minimal subcategories of compactly generated tensor triangulated categories, paying special attention to the derived category of a commutative noetherian ring. A cohomological criterion for detecting these…

Commutative Algebra · Mathematics 2023-03-09 Dave Benson , Srikanth B. Iyengar , Henning Krause , Julia Pevtsova
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