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168
A homotopy theoretic realization of string topology
, 2002
"... Abstract. Let M be a closed, oriented manifold of dimension d. Let LM be the space of smooth loops in M. In [2] Chas and Sullivan defined a product on the homology H∗(LM) of degree −d. They then investigated other structure that this product induces, including a Lie algebra structure on H∗(LM), and ..."
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Cited by 156 (19 self)
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Abstract. Let M be a closed, oriented manifold of dimension d. Let LM be the space of smooth loops in M. In [2] Chas and Sullivan defined a product on the homology H∗(LM) of degree −d. They then investigated other structure that this product induces, including a Lie algebra structure on H∗(LM), and an induced product on the S 1 equivariant homology, H S1 ∗ (LM). These algebraic structures, as well as others, came under the general heading of the “String topology ” of M. In this paper we will describe a realization of the Chas Sullivan loop product in terms of a ring spectrum structure on the Thom spectrum of a certain virtual bundle over the loop space. We show that this ring spectrum structure extends to an operad action of the the “cactus operad”, originally defined by Voronov, which is equivalent to operad of framed disks in R 2. We then describe a cosimplicial model of this spectrum and, by applying the singular cochain functor to this cosimplicial spectrum we show that this ring structure can be interpreted as the cup product in the Hochschild cohomology, HH ∗ (C ∗ (M); C ∗ (M)).
Modular Operads
 COMPOSITIO MATH
, 1994
"... We develop a "higher genus" analogue of operads, which we call modular operads, in which graphs replace trees in the definition. We study a functor F on the category of modular operads, the Feynman transform, which generalizes Kontsevich's graph complexes and also the bar constructi ..."
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Cited by 106 (5 self)
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We develop a "higher genus" analogue of operads, which we call modular operads, in which graphs replace trees in the definition. We study a functor F on the category of modular operads, the Feynman transform, which generalizes Kontsevich's graph complexes and also the bar construction for operads. We calculate the Euler characteristic of the Feynman transform, using the theory of symmetric functions: our formula is modelled on Wick's theorem. We give applications to the theory of moduli spaces of pointed algebraic curves.
Brane Topology
 In preparation
"... Consider two families of closed oriented curves in a manifold M d. At each point of intersection of a curve of one family with a curve of the other family, form a new closed curve by going around the first curve and then going around the second. Typically, an idimensional family and a jdimensional ..."
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Cited by 93 (3 self)
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Consider two families of closed oriented curves in a manifold M d. At each point of intersection of a curve of one family with a curve of the other family, form a new closed curve by going around the first curve and then going around the second. Typically, an idimensional family and a jdimensional family will produce an i + j − d + 2dimensional family. Our purpose is to describe a mathematical structure behind such interactions. 1
Gerstenhaber algebras and BV algebras in Poisson geometry
"... The purpose of this paper is to establish an explicit correspondence between various geometric structures on a vector bundle with some wellknown algebraic structures such as Gerstenhaber algebras and BValgebras. Some applications are discussed. In particular, we found an explicit connection betwee ..."
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Cited by 64 (5 self)
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The purpose of this paper is to establish an explicit correspondence between various geometric structures on a vector bundle with some wellknown algebraic structures such as Gerstenhaber algebras and BValgebras. Some applications are discussed. In particular, we found an explicit connection between the KoszulBrylinski operator of a Poisson manifold and its modular class. As a consequence, we prove that Poisson homology is isomorphic to Poisson cohomology for unimodular Poisson structures. 1
On Operad Structures of Moduli Spaces and String Theory
, 1994
"... We construct a real compactification of the moduli space of punctured rational algebraic curves and show how its geometry yields operads governing homotopy Lie algebras, gravity algebras and BatalinVilkovisky algebras. These algebras appeared recently in the context of string theory, and we give a ..."
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Cited by 63 (13 self)
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We construct a real compactification of the moduli space of punctured rational algebraic curves and show how its geometry yields operads governing homotopy Lie algebras, gravity algebras and BatalinVilkovisky algebras. These algebras appeared recently in the context of string theory, and we give a simple deduction of these algebraic structures from the formal axioms of conformal field theory and string theory.
Noncommutative differential calculus, homotopy . . .
, 2000
"... We define a notion of a strong homotopy BV algebra and apply it to deformation theory problems. Formality conjectures for Hochschild cochains are formulated. We prove several results supporting these conjectures. ..."
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Cited by 57 (1 self)
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We define a notion of a strong homotopy BV algebra and apply it to deformation theory problems. Formality conjectures for Hochschild cochains are formulated. We prove several results supporting these conjectures.
Cyclic operads and cyclic homology
 in &quot;Geometry, Topology and Physics,&quot;International
, 1995
"... The cyclic homology of associative algebras was introduced by Connes [4] and Tsygan [22] in order to extend the classical theory of the Chern character to the noncommutative setting. Recently, there has been increased interest in more general algebraic structures than associative algebras, characte ..."
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Cited by 47 (3 self)
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The cyclic homology of associative algebras was introduced by Connes [4] and Tsygan [22] in order to extend the classical theory of the Chern character to the noncommutative setting. Recently, there has been increased interest in more general algebraic structures than associative algebras, characterized by the presence of several algebraic operations. Such structures appear, for example, in homotopy theory [18], [3] and topological field theory [9]. In this paper, we extend the formalism of cyclic homology to this more general framework. This extension is only possible under certain conditions which are best explained using the concept of an operad. In this approach to universal algebra, an algebraic structure is described by giving, for each n ≥ 0, the space P(n) of all nary expressions which can be formed from the operations in the given algebraic structure, modulo the universally valid identities. Permuting the arguments of the expressions gives an action of the symmetric group Sn on P(n). The sequence P = {P(n)} of these Snmodules, together with the natural composition structure on them, is the operad describing our class of algebras. In order to define cyclic homology for algebras over an operad P, it is necessary that P is what we call a cyclic operad: this means that the action of Sn on P(n) extends to an action of Sn+1 in a way compatible with compositions (see Section 2). Cyclic
Twodimensional topological gravity and equivalent cohomology
 Commun. Math. Phys
, 1994
"... The analogy between topological string theory and equivariant cohomology for differentiable actions of the circle group on manifolds has been widely remarked on. One of our aims in this paper is to make this analogy precise. We show that topological string theory is the “derived functor ” of semire ..."
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Cited by 46 (2 self)
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The analogy between topological string theory and equivariant cohomology for differentiable actions of the circle group on manifolds has been widely remarked on. One of our aims in this paper is to make this analogy precise. We show that topological string theory is the “derived functor ” of semirelative cohomology, just as equivariant cohomology is the derived functor of basic cohomology. That homological algebra finds a place in the study of topological string theory should not surprise the reader, granted that topological string theory is the conformal field theorist’s algebraic topology. In [7], we have shown that the cohomology of a topological conformal field theory carries the structure of a BatalinVilkovisky algebra (actually, two commuting such structures, corresponding to the two chiral sectors of the theory). In the second part of this paper, we describe the analogous algebraic structure on the equivariant cohomology of a topological conformal field theory: we call this structure a gravity algebra. This algebraic structure is a certain generalization of a Lie algebra, and is distinguished by the fact that it has an infinite sequence of independent operations {a1,...,ak}, k ≥ 2, satisfying quadratic relations generalizing the Jacobi rule. (The operad underlying the category of gravity algebras has been studied independently by GinzburgKapranov [9].)
On the relation between open and closed topological strings.” hepth/0405232
, 2004
"... Abstract. We discuss the relation between open and closed string correlators using topological string theories as a toy model. We propose that one can reconstruct closed string correlators from the ..."
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Cited by 44 (1 self)
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Abstract. We discuss the relation between open and closed string correlators using topological string theories as a toy model. We propose that one can reconstruct closed string correlators from the