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48 results for Thom classes

Extends Y.Eliashberg's h-principle to generic maps with prescribed Thom-Boardman singularities.

problem Homotoping maps with specific singularities.
method Proves a condition for continuous maps to be homotopic to generic maps with prescribed Thom-Boardman singularities.
result Necessary and sufficient condition for homotopy in dimension 3.

The study tackles realisability of twisted homology classes and introduces new techniques in parametrised homotopy theory.

problem When a twisted homology class is realised by a submanifold.
method Introducing cobordism classes twisted by a coefficient system, defining a twisted Thom space, and constructing a parametrised Postnikov tower.
result A twisted homology class is realisable if and only if its Poincaré dual is the image of the twisted Thom class under a parametrised map.

Relative Thom polynomials for maps around boundaries established.

problem Understanding singularities in maps around boundaries.
method Introducing and analyzing Thom polynomials relative to prescribed maps around boundaries, establishing structure theorems and correction terms.
result Unified framework for invariants of immersions and singularities of their extensions.

The paper finds a geometric explanation for coinciding Thom polynomials of cusp and corank-2 singularities.

problem Explaining the coincidence of Thom polynomials for cusp and corank-2 singularities.
method Analyzing geometrically the coincidence of Thom polynomials for Morin and corank-2 singularities.
result Found a geometric explanation for the coincidence of Thom polynomials for Morin and corank-2 singularities.

After a review of several methods designed to produce equivariant cohomology classes, we apply one introduced by Berline, Getzler and Vergne, to get a family of representatives of the universal Thom class of a vector bundle. Surprisingly, this family does not contain the representative given by Mathaï and Quillen. Howe…

1997-01-20abs ↗pdf ↗

These notes are the first chapter of a monograph, dedicated to a detailed proof of the equivariant index theorem for transversally elliptic operators. In this preliminary chapter, we prove a certain number of natural relations in equivariant cohomology. These relations include the Thom isomorphism in equivariant cohomo…

2007-11-25abs ↗pdf ↗

New findings contradict the Thom conjecture for high degree hypersurfaces in CP3CP^3.

problem Finding the simplest smooth simply connected 4-manifold in CP3CP^3 homologous to a degree dd hypersurface VdV_d.
method Comparing b2b_2 values of manifolds in the same homology class as VdV_d.
result For all d5d \geq 5, there exists a manifold MdM_d with b2(Md)<b2(Vd)b_2(M_d) < b_2(V_d).

New geometric model for equivariant cohomotopy using bordism.

problem Identifying equivariant cohomotopy classes with fixed point bordism.
method Equivariant Pontrjagin-Thom construction for global quotient orbifolds.
result Recovery of Wasserman's construction and new perspective on equivariant bordism.

Let G be a compact Lie group. Let M be a smooth G-manifold and V --> M be an oriented G-equivariant vector bundle. One defines the spaces of equivariant forms with generalized coefficients on V and M. An equivariant Thom form θθ on V is a compactly supported closed equivariant form such that its integral along the fib…

2004-02-04abs ↗pdf ↗

Quantum field theory methods yield a physical interpretation of elliptic cohomology.

problem Constructing elliptic cohomology with complex coefficients.
method Using 2D quantum field theory to rigorously construct cocycles.
result Physical interpretation of the elliptic index theorem with complex coefficients.

Develops a new geometric cobordism theory using smooth Thom stacks.

problem Creating a versatile geometric cobordism theory for various geometric data.
method Introducing smooth Thom stacks and identifying a smooth representative of the Thom functor.
result The new theory generalizes parametrized cobordism and includes families of geometric data.

In this paper, we demonstrate a relation among Seiberg-Witten invariants which arises from embedded surfaces in four-manifolds whose self-intersection number is negative. These relations, together with Taubes' basic theorems on the Seiberg-Witten invariants of symplectic manifolds, are then used to prove the symplectic…

1998-11-13abs ↗pdf ↗

New techniques via bridge trisections prove the Thom conjecture in CP^2.

problem Understanding surfaces in CP^2 and proving the Thom conjecture.
method Developed new techniques using bridge trisections for smoothly embedded surfaces in 4-manifolds.
result A new proof of the Thom conjecture in CP^2, avoiding gauge theory.

Researchers describe a new Thom form for mapping cones.

problem Developing a new Thom form for mapping cones.
method Using the mapping cone covariant derivative and Berezin integral, they explicitly write down the Thom form.
result The Thom form is closed with respect to the mapping cone differentiation, integrates to 1 along the fiber, and satisfies the transgression formula.

Thom announced a homological h-principle, which was later proven by connecting combinatorial techniques with Thurston's jiggling method.

problem The h-principle in immersion theory, particularly the sphere inside-out problem.
method Combining combinatorial techniques with Thurston's jiggling method.
result The announced homological h-principle was proven true.

Let NN and PP be smooth closed manifolds of dimensions nn and pp respectively. Given a Thom-Boardman symbol II, a smooth map f:NPf:N\to P is called an ΩIΩ^{I}-regular map if and only if the Thom-Boardman symbol of each singular point of ff is not greater than II in the lexicographic order. We will represent the gr…

2004-12-13abs ↗pdf ↗

In this work we analyze the behavior of Massey products of closed manifolds under the blow-up construction. The results obtained in the article are applied to the problem of constructing closed symplectic non-formal manifolds. The proofs use Thom spaces as an important technical tool. This application of Thom spaces is…

1999-07-06abs ↗pdf ↗

This article is devoted to the study of smooth desingularization, which are customary employed in the definition of De Rham Intersection Cohomology with differential forms. In this paper we work with the category of Thom-Mather simple spaces. We construct a functor which sends each Thom-Mather simple space into a smoot…

2008-06-02abs ↗pdf ↗

The study calculates the Smith-Thom deficiency of Hilbert squares and provides conditions for maximality.

problem Calculating the Smith-Thom deficiency of Hilbert squares and conditions for maximality.
method Using Mayer-Vietoris mapping and rank calculations.
result Established necessary and sufficient conditions for maximality of Hilbert squares in projective complete intersections.

New constructions show manifold volumes are dense in non-negative reals.

problem Understanding the spectrum of simplicial volumes in manifolds.
method Group homology constructions and manifold constructions using cross-products and Thom realisation.
result The set of simplicial volumes of orientable closed connected manifolds is dense in R0\mathbb{R}_{\geq 0} for dimensions > 3, and every non-negative rational number is a simplicial volume for dimension 4.

This paper studies torsion obstructions to complex sections on manifolds.

problem Torsion obstructions to finding complex sections on almost complex manifolds.
method Calculations using the Adams-Novikov spectral sequence for Thom spectra.
result Torsion obstructions for finding rr complex sections of order pp vanish for r<p2pr < p^2 - p.

We prove a generalization of Thom's transversality theorem. It gives conditions under which the jet map $f_*|_Y:Y\subseteq J^r(D,M)\ra J^r(D,N)$ is generically (for $f:M\ra N$) transverse to a submanifold ZJr(D,N)Z\subseteq J^r(D,N). We apply this to study transversality properties of a restriction of a fixed map $g:M\ra P$

2010-01-13abs ↗pdf ↗

Develops deformation theory for mapping spaces related to Morse theory and Bott-Thom isomorphism.

problem Studying weak homotopy equivalences and decompositions of vector bundles.
method Morse theory on path spaces, deformation theory, Clifford representations, Bott-Thom isomorphism.
result Stable decompositions of vector bundles over sphere bundles derived from Clifford representations.

Paper confirms Thom's conjecture for nonlinear evolutions on manifolds.

problem Thom's gradient conjecture for nonlinear evolution equations.
method Extending and settling the conjecture in infinite dimensional problems using Łojasiewicz, L. Simon, and Kurdyka-Mostowski-Parusinski's foundational works.
result Uniqueness of the limiting direction and characterization of convergence rates for both classical and infinite dimensional settings.

This paper has been withdrawn by the author due a crucial sign error in Theorem B. We present a geometric proof of Thom conjecture, which uses Khovanov homology. Our approach doesn't use any analytic methods and is quite different from proof given by Kronheimer and Mrowka in 1994.

2007-08-02abs ↗pdf ↗

The main result of this paper is a sufficient condition in order to have a compact Thom-Mather stratified pseudomanifold endowed with a c^\hat{c}-iterated edge metric on its regular part qq-parabolic. Moreover, besides stratified pseudomanifolds, the qq-parabolicity of other classes of singular spaces, such as compac…

2015-05-26abs ↗pdf ↗

Study shows a modified cobordism category's first derivative is equivalent to a Thom spectrum.

problem Analyzing the homotopy type of surface cobordism categories.
method Defined a new cobordism category over a base space, proving properties of induced functors and derivatives.
result The first derivative of the induced functor is equivalent to a Thom spectrum.

We show that the spectrum constructed by Everitt and Turner as a possible Khovanov homotopy type is a product of Eilenberg-MacLane spaces and is thus determined by Khovanov homology. By using the Dold-Thom functor it can therefore be obtained from the Khovanov homotopy type constructed by Lipshitz and Sarkar.

2012-02-08abs ↗pdf ↗

Study cohomotopy classes for 4-manifolds using complex spin structures.

problem Understanding cohomotopy classes for families of 4-manifolds with complex spin structures.
method Using Bauer--Furuta invariants in parametrised stable homotopy theory.
result Definition of characteristic cohomotopy classes on Thom spectra.