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We show that Rabinowitz Floer homology and cohomology carry the structure of a graded Frobenius algebra for both closed and open strings. We prove a Poincar\'e duality theorem between homology and cohomology that preserves this structure.…

Symplectic Geometry · Mathematics 2026-05-08 Kai Cieliebak , Nancy Hingston , Alexandru Oancea

We develop a method for studying the pointed loop space of general polyhedral products, showing that many properties are determined by the moment-angle complex. To apply the method, we show that localised away from a finite set of primes,…

Algebraic Topology · Mathematics 2026-01-15 Lewis Stanton , Fedor Vylegzhanin

We describe a construction of fibrewise inner products on the cotangent bundle of the smooth free loop space of a Riemannian manifold. Using this inner product, we construct an operator over the loop space of a string manifold which is…

Differential Geometry · Mathematics 2007-05-23 Andrew Stacey

We use the framework of Morse theory with differential graded coefficients to study certain operations on the total space of a fibration. More particularly, we focus in this paper on a chain-level description of the Chas-Sullivan product on…

Algebraic Topology · Mathematics 2025-11-26 Robin Riegel

We show that Lupercio-Uribe-Xicot\'{e}ncatl's orbifold loop product and coproduct can be described by a group cohomology class in some cases. By computing this cohomology class, we show that in some cases the orbifold loop product is…

Algebraic Topology · Mathematics 2021-01-21 Yasuhiko Asao

We give a finite dimensional approach to the Chas-Sullivan product on the free loop space of a manifold, orientable or not.

Geometric Topology · Mathematics 2011-06-02 Francois Laudenbach

In this article we consider algebraic structures on the homology of the space of paths in a manifold with endpoints in a submanifold. The Pontryagin-Chas-Sullivan product on the homology of this space had already been investigated by…

Algebraic Topology · Mathematics 2025-02-11 Maximilian Stegemeyer

We study the space of paths in a closed manifold $M$ with endpoints determined by an involution $f\colon M\to M$. If the involution is fixed point free and if $M$ is $2$-connected then this path space is the universal covering space of the…

Differential Geometry · Mathematics 2025-03-28 Maximilian Stegemeyer

In this paper we establish a connection between the loop space homology of the generalization of wedge defined by a simplicial complex K (so called polyhedral product) and the homology of certain diagonal arrangements associated with K. We…

Algebraic Topology · Mathematics 2009-01-20 Natalia Dobrinskaya

On the free loop space of compact symmetric spaces Ziller introduced explicit cycles generating the homology of the free loop space. We use these explicit cycles to compute the string topology coproduct on complex and quaternionic…

Algebraic Topology · Mathematics 2023-12-11 Maximilian Stegemeyer

We consider the space $\Lambda M:=H^1(S^1,M)$ of loops of Sobolev class $H^1$ of a compact smooth manifold $M$, the so-called free loop space of $M$. We take quotients $\Lambda M/G$ where $G$ is a finite subgroup of $O(2)$ acting by linear…

Algebraic Topology · Mathematics 2022-12-20 Philippe Kupper

Using a cap product, we construct an explicit Poincar\'e duality isomorphism between the blown-up intersection cohomology and the Borel-Moore intersection homology, for any commutative ring of coefficients and second-countable, oriented…

Algebraic Topology · Mathematics 2020-09-22 Martintxo Saralegi-Aranguren , Daniel Tanré

In this paper, we compute the cohomology ring of all homology split polyhedral product spaces and the cohomology algebra over a field of all polyhedral product spaces. As an application, we give two polyhedral product spaces such that all…

Algebraic Topology · Mathematics 2016-05-19 Qibing Zheng

The virtual cohomology of an orbifold is a ring structure on the cohomology of the inertia orbifold whose product is defined via the pull-push formalism and the Euler class of the excess intersection bundle. In this paper we calculate the…

Algebraic Topology · Mathematics 2007-11-19 David Riveros , Bernardo Uribe

We prove that the pair-of-pants product on the Floer homology of the cotangent bundle of a compact manifold M corresponds to the Chas-Sullivan loop product on the singular homology of the loop space of M. We also prove related results…

Symplectic Geometry · Mathematics 2015-06-18 Alberto Abbondandolo , Matthias Schwarz

The aim of this paper is to explain the relationship between the (co)homology of the free loop space and the Hochschild homology of its singular cochain algebra. We introduce all the relevant technical tools, namely simplicial and cyclic…

Algebraic Topology · Mathematics 2011-10-04 Jean-Louis Loday

We study the multiplicative structure of orbifold Hochschild cohomology in an attempt to generalize the results of Kontsevich and Calaque-Van den Bergh relating the Hochschild and polyvector field cohomology rings of a smooth variety. We…

Algebraic Geometry · Mathematics 2021-01-19 Andrei Caldararu , Shengyuan Huang

We introduce a common domain of definition for the loop product and the loop coproduct, reduced loop homology, on which they combine to a unital infinitesimal anti-symmetric bialgebra structure. In particular, a relation conjectured by…

Symplectic Geometry · Mathematics 2026-04-15 Kai Cieliebak , Alexandru Oancea

We show that the loop homology algebras of polyhedral products of the form $(\underline{X},\underline{*})^{\mathcal{K}}$ can be written as a colimit over the flagification of $\mathcal{K}$, and obtain a similar result for the Poincar\'e…

Algebraic Topology · Mathematics 2026-04-29 Lewis Stanton , Fedor Vylegzhanin

We calculate the homology of the free loop space of (n-1)-connected closed manifolds of dimension at most 3n-2 (n > 1), with the Chas-Sullivan loop product and loop bracket. Over a field of characteristic zero, we obtain an expression for…

Algebraic Topology · Mathematics 2015-02-12 Alexander Berglund , Kaj Börjeson