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We prove that the map on Balmer spectra induced by a fully faithful geometric functor is a quotient map whose fibers are connected. This is an analogue of the Zariski Connectedness Theorem in algebraic geometry and it can be applied to a…

Algebraic Topology · Mathematics 2025-08-05 Beren Sanders

We establish basic results of complex function theory within certain algebras of holomorphic functions on coverings of Stein manifolds (such as algebras of Bohr's holomorphic almost periodic functions on tube domains or algebras of all…

Complex Variables · Mathematics 2013-10-01 A. Brudnyi , D. Kinzebulatov

We generalize the construction of reflection functors from classical representation theory of quivers to arbitrary small categories with freely attached sinks or sources. These reflection morphisms are shown to induce equivalences between…

Algebraic Topology · Mathematics 2017-09-12 Moritz Groth , Jan Stovicek

A natural higher K-theoretic analogue of the triviality of vector bundles on affine toric varieties is the conjecture on nilpotence of the multiplicative action of the natural numbers on the K-theory of these varieties. This includes both…

K-Theory and Homology · Mathematics 2007-05-23 Joseph Gubeladze

In these lecture notes we review the various relations between intersection theory on the moduli space of Riemann surfaces, integrable hierarchies of KdV type, matrix models, and topological quantum field theories. We explain in particular…

High Energy Physics - Theory · Physics 2007-05-23 Robbert Dijkgraaf

We apply the mechanism of factorization homology to construct and compute category-valued two-dimensional topological field theories associated to braided tensor categories, generalizing the $(0,1,2)$-dimensional part of…

Quantum Algebra · Mathematics 2018-08-15 David Ben-Zvi , Adrien Brochier , David Jordan

We review and extend the theory of Thom spectra and the associated obstruction theory for orientations. We recall (from May, Quinn, and Ray) that a commutative ring spectrum A has a spectrum of units gl(A). To a map of spectra f: b ->…

Algebraic Topology · Mathematics 2009-11-09 Matthew Ando , Andrew J. Blumberg , David J. Gepner , Michael J. Hopkins , Charles Rezk

We describe the cohomology of the quotient Z_K/H of a moment-angle complex Z_K by a freely acting subtorus H in T^m by establishing a ring isomorphism of H*(Z_K/H,R) with an appropriate Tor-algebra of the face ring R[K], with coefficients…

Algebraic Topology · Mathematics 2015-11-30 Taras Panov

In Part I, we proved that a rational model for the fiberwise THH transfer of a map $f$ of fibrations over a base space is given by the Hochschild homology transfer of a cdga model of $f$. In this paper, we provide an explicit description of…

Algebraic Topology · Mathematics 2026-04-28 Florian Naef , Robin Stoll

We categorify the inclusion-exclusion principle for partially ordered topological spaces and schemes to a filtration on the derived category of sheaves. As a consequence, we obtain functorial spectral sequences that generalize the two…

Algebraic Geometry · Mathematics 2022-04-11 Ronno Das , Sean Howe

The Haar functional on the quantum $SU(2)$ group is the analogue of invariant integration on the group $SU(2)$. If restricted to a subalgebra generated by a self-adjoint element the Haar functional can be expressed as an integral with a…

Quantum Algebra · Mathematics 2016-09-06 Erik Koelink , J. Verding

We construct a commutative orthogonal $C_2$-ring spectrum, $\mathrm{MSpin}^c_{\mathbb{R}}$, along with a $C_2$-$E_{\infty}$-orientation $\mathrm{MSpin}^c_{\mathbb{R}} \to \mathrm{KU}_{\mathbb{R}}$ of Atiyah's Real K-theory. Further, we…

Algebraic Topology · Mathematics 2025-08-14 Zachary Halladay , Yigal Kamel

Katzarkov has proposed a generalization of Kontsevich's mirror symmetry conjecture, covering some varieties of general type. Seidel \cite{Se} has proved a version of this conjecture in the simplest case of the genus two curve. Basing on the…

Algebraic Geometry · Mathematics 2025-02-07 Alexander I. Efimov

In $G$-equivariant stable homotopy theory, it is known that the equivariant Eilenberg-Mac Lane spectra representing ordinary equivariant cohomology have nontrivial $RO(G)$-graded homotopy corresponding to the equivariant (co)homology of…

Algebraic Topology · Mathematics 2025-04-04 Jesse Keyes

We develop a operator algebraic model for twisted $K$-theory, which includes the most general twistings as a generalized cohomology theory (i.e. all those classified by the unit spectrum $bgl_1(KU)$). Our model is based on strongly…

K-Theory and Homology · Mathematics 2016-03-07 Ulrich Pennig

The purpose of this article is to show that flat compact K\"ahler manifolds exhibit the structure of a Frobenius manifold, a structure originating in 2D Topological Quantum Field Theory and closely related to Joyce structure. As a result,…

Differential Geometry · Mathematics 2025-01-03 Noémie. C. Combe

We construct a symmetric spectrum representing the G-equivariant K-theory of C*-algebras for a compact group or a proper groupoid G. Our spectrum is functorial for equivariant *-homomorphisms. We use this to establish the additivity of the…

K-Theory and Homology · Mathematics 2011-04-19 Ivo Dell'Ambrogio , Heath Emerson , Tamaz Kandelaki , Ralf Meyer

Based on Morse theory for the energy functional on path spaces we develop a deformation theory for mapping spaces of spheres into orthogonal groups. This is used to show that these mapping spaces are weakly homotopy equivalent, in a stable…

Algebraic Topology · Mathematics 2021-04-14 Jost-Hinrich Eschenburg , Bernhard Hanke

We extend Geisser and Hesselholt's result on ``bi-relative K-theory'' from discrete rings to connective ring spectra. That is, if $\mathcal A$ is a homotopy cartesian $n$-cube of ring spectra (satisfying connectivity hypotheses), then the…

K-Theory and Homology · Mathematics 2007-05-23 Bjørn Ian Dundas , Harald Øyen Kittang

By employing polynomial-reduced KP integrability, combined with the string equation, this work establishes explicit relationships between the generalized Kontsevich model, the topological recursion of the spectral curve, and the geometry of…

Mathematical Physics · Physics 2026-05-05 Shuai Guo , Ce Ji , Chenglang Yang , Qingsheng Zhang