Study connects surface twists to curve invariants.
problem Understanding fractional Dehn twists on Riemann surfaces.
method Characterization of pseudo-periodic maps and bounds on fractional twists.
result Established relationship between twists and curve invariants.
New bounds on categorified link invariants using fractional Dehn twist coefficients.
problem Bounding ranks of categorified link invariants.
method Using fractional Dehn twist coefficients and link Floer homology.
result Lower bounds on ranks of categorified link invariants.
The paper uses Floer homology to study twist coefficients and their behavior after capping off.
problem Behavior of twist coefficients after capping off a boundary component.
method Heegaard Floer homology to constrain twist coefficients.
result Results about fractional Dehn twists and Floer homology of cyclic branched covers.
Study shows Dehn twist coefficients are consistent across different actions on surfaces.
problem Consistency of fractional Dehn twist coefficients under various actions.
method Analyzes left orderings of mapping class groups and uses cofinality properties.
result Fractional Dehn twist coefficients are independent of the underlying action for surfaces with genus > 1.
Study fractional twist behavior in branched covers, with applications to 3-manifolds.
problem Behavior of fractional Dehn twist coefficients in branched coverings.
method Analyzes fully ramified branched coverings and their effects on 3-manifolds.
result Non-right-veering braids represent virtually loose transverse links.
Sharp lower bounds for modular invariants and Dehn twist coefficients in genus 2 and 3.
problem Finding sharp lower bounds for modular invariants and Dehn twist coefficients.
method Analyzing the relation between fractional Dehn twists and modular invariants, classifying pseudo-periodic maps, and proving rigidity properties.
result Sharp lower bounds for modular invariants and Dehn twist coefficients in genus 2 and 3.
We establish a relationship between Heegaard Floer homology and the fractional Dehn twist coefficient of surface automorphisms. Specifically, we show that the rank of the Heegaard Floer homology of a 3-manifold bounds the absolute value of the fractional Dehn twist coefficient of the monodromy of any of its open book d…
Characterizes fractional Dehn twist coefficient and proves slice-Bennequin inequality.
problem Understanding the fractional Dehn twist coefficient and its relation to smooth slice genus.
method Characterization of FDTC and establishing the slice-Bennequin inequality.
result Affine linear lower bound for smooth slice genus in terms of FDTC.
Braids with more twists than strands achieve their braid index.
problem Understanding the braid index of closures of braids with fractional Dehn twist coefficients.
method Characterizing fractional Dehn twist coefficients in terms of the Upsilon function and proving the braid index via homogenization of knot concordance homomorphisms.
result Proves that n-braids with fractional Dehn twist coefficient larger than n−1 realize the braid index of their closure. Characterizes braid types and estimates twist coefficients.
problem Understanding braid types and their properties.
method Birman-Ko-Lee left canonical form of braids.
result Characterization of almost strongly quasipositive braids and estimates of fractional Dehn twist coefficient.
Study of hyperbolic 3-manifolds via fractional Dehn twists and cusp geometry.
problem Understanding the geometry of fibred hyperbolic 3-manifolds via combinatorial data.
method Relating Euclidean cusp geometry to fractional Dehn twist coefficients of monodromies.
result Uniform bounds on fractional Dehn twist coefficients for certain open book decompositions.
New coefficient detects irrational rotation behavior on infinite-type surfaces.
problem Detecting irrational rotation behavior on surfaces of infinite type.
method Introducing a new quasimorphism, the Dehn twist coefficient, and proving its properties.
result The Dehn twist coefficient can have image all of R for some infinite-type surfaces.
New examples show high twisting doesn't guarantee open book maximality.
problem Maximality of open book pages under high twisting.
method Double branched covers of closed braids.
result Arbitrarily high twisting does not guarantee maximal Euler characteristic.
We introduce an essential open book foliation, a refinement of the open book foliation, and develop technical estimates of the fractional Dehn twist coefficient (FDTC) of monodromies and the FDTC for closed braids, which we introduce as well. As applications, we quantitatively study the `gap' of overtwisted contact str…
Proof of contact structure from taut foliation for certain knots.
problem Contact structures from taut foliations for specific knots.
method Alternative proof using pseudo-Anosov monodromy and fractional Dehn twist coefficient.
result Fibered knots with certain properties support contact structures that are taut foliation perturbations.
Positive factorization for pseudoperiodic homeomorphisms on surfaces.
problem Factorization of pseudoperiodic homeomorphisms on surfaces.
method Generalization of classical results on smooth germs of surfaces, topological characterization of monodromies, and use of positive factorization criteria.
result Pseudoperiodic homeomorphisms on surfaces with positive fractional Dehn twist coefficients and screw numbers admit a positive factorization.
Study on transverse invariant from Khovanov homology and its properties.
problem Understanding the relationship between knot isotopy and transverse isotopy.
method Analyzing fractional Dehn twist coefficients, quasipositivity, and stability of transverse invariants.
result Stability and triviality of the transverse invariant for specific families of braids and knots.
Using open book foliations we show that an overtwisted disc in a planar open book can be put in a topologically nice position. As a corollary, we prove that a planar open book whose fractional Dehn twist coefficients grater than one for all the boundary components supports a tight contact structure.
A result of Malyutin shows that a random walk on the mapping class group gives rise to an element whose fractional Dehn twist coefficient is large or small enough. We show that this leads to several properties of random 3-manifolds and links. For example, random closed braids and open books are hyperbolic.
Fractional Dehn twists give a measure of the difference between the relative isotopy class of a homeomorphism of a bordered surface and the Thurston representative of its free isotopy class. We show how to estimate and compute these invariants. We discuss the the relationship of our work to stabilization problems in cl…
We define symplectic fractional twists, which generalize Dehn twists, and use these in open books to investigate contact structures. The resulting contact structures are invariant under a circle action, and share several similarities with the invariant contact structures that were studied by Lutz and Giroux. We show th…
Let Sg be a closed orientable surface of genus g≥2 and C a simple closed nonseparating curve in F. Let tC denote a left handed Dehn twist about C. A \textit{fractional power} of tC of \textit{exponent} $\fraction{\ell}{n}$ is an $h \in \Mod(S_g)$ such that hn=tCℓ. Unlike a root of a $t…
Study on defect of Bennequin-Eliashberg inequality and its relation to minimal genus Bennequin surfaces.
problem Exploring the defect of the Bennequin-Eliashberg inequality and its relation to minimal genus Bennequin surfaces.
method Defined the defect δ(T) of the Bennequin-Eliashberg inequality for null-homologous transverse links in contact manifolds with open books. Studied relations between δ(T) and minimal genus Bennequin surfaces, particularly in disk open book cases.
result The Bennequin inequality is sharp if and only if it is the closure of a strongly quasipositive braid, as shown by the equality δ(T) = N for certain conditions.
A closed braid naturally gives rise to a transverse link in the standard contact 3-space. We study the effect of the dynamical properties of the braid monodromy, such as right-veering, on the contact-topological properties of the transverse link and its transverse invariants in knot Floer and Khovanov homologies. In pa…
We produce the first examples of closed, tight contact 3-manifolds which become overtwisted after performing admissible transverse surgeries. Along the way, we clarify the relationship between admissible transverse surgery and Legendrian surgery. We use this clarification to study a new invariant of transverse knots - …
Fixed pseudo-Anosov homeomorphisms detect cinquefoil knot.
problem Detecting the cinquefoil knot using knot Floer homology.
method Using pseudo-Anosov homeomorphisms and Floer homology.
result The cinquefoil knot is the only genus-two L-space knot.
Study finds the order of Dehn twists in various groups.
problem Determining the order of Dehn twists in different topological groups.
method Analyzing the specific groups mentioned in the abstract.
result The order of Dehn twists was calculated in the specified groups.
New invariant shows non-zero transverse links in open books.
problem Transverse invariants in open book structures.
method Knot Floer homology and transverse link invariants.
result Transverse link invariant is always nonzero.
Paper examines Dehn twists on non-orientable surfaces and their limitations.
problem Limitations of generating Dehn twists on non-orientable surfaces.
method Analyzes the level 2 mapping class group of non-orientable surfaces and their subgroups.
result Dehn twist subgroup of M2(Ng) cannot be generated by squares of Dehn twists about non-separating curves. Paper finds a minimal set of Dehn twists to generate twist subgroup of non-orientable surfaces.
problem Finding a minimal set of Dehn twists to generate the twist subgroup of non-orientable surfaces.
method Used Dehn twists and an argument from Hirose [5] to find a minimal generating set.
result Found a generating set with one less element than the lower bound.
Study of Dehn twists in free groups generates right-angled Artin groups.
problem Understanding dynamics of Dehn twists in free groups.
method Geometry of spheres, tori, and curves in a doubled handlebody; analysis of compatibility conditions.
result Sufficiently large powers of Dehn twists generate right-angled Artin groups.
We determine parts of the contact homology of certain contact 3-manifolds in the framework of open book decompositions, due to Giroux. We study two cases: when the monodromy map of the compatible open book is periodic and when it is pseudo-Anosov. For an open book with periodic monodromy, we verify the Weinstein conjec…
The paper explores methods to decompose periodic maps into Dehn twists.
problem Factoring periodic maps into Dehn twists.
method Various methods for factoring periodic mapping classes into Dehn twists, up to conjugacy.
result Existence of conjugates of periodic maps whose product is pseudo-Anosov.
Generalized Dehn twists in surfaces and 3D relate to homology and skein algebras.
problem Understanding and classifying Dehn twists in various contexts.
method Algebraic and geometric constructions, including automorphisms of fundamental groups and diffeomorphisms.
result Generalized Dehn twists are realized as diffeomorphisms and have algebraic structures.
The study examines subgroups of torus mapping class group generated by Dehn twists powers.
problem Characterizing subgroups generated by powers of Dehn twists.
method Using the ping pong lemma and geometric intersection numbers.
result Subgroups can be free groups, direct products, or have specific ranks.
It is proved that the stable commutator length of a Dehn twist in the mapping class group is positive and the tenth power of a Dehn twist about a nonseparating simple closed curve is a product of two commutators. As an application a new proof of the fact that the growth rate of a Dehn twist is linear is given.
We determine lens surgeries (i.e.\ Dehn surgery yielding a lens space) along the n-twisted Whitehead link. To do so, we first give necessary conditions to yield a lens space from the Alexander polynomial of the link as: (1) n=1 (i.e. the Whitehead link), and (2) one of surgery coefficients is 1, 2 or 3. Our interes…
Calculates Dehn twist actions on conformal blocks for modular categories.
problem Order of Dehn twists on spaces of conformal blocks.
method Quantum representations of mapping class groups, ribbon twists, monoidal powers.
result Order of Dehn twists generalizes previous results for small quantum group.
Generates spin structure stabilizers using Dehn twists.
problem Determining generating sets for spin structure stabilizers.
method Using Dehn twists on specific curves.
result Explicit generating sets for stabilizers of spin structures.
Study of superelliptic curves and complex braid groups, computing homology.
problem Understanding the homology of superelliptic curves and their associated braid groups.
method Analysis of the universal family of superelliptic curves, computation of homology groups using complex braid groups.
result Complete calculation of integral homology groups of End over finite fields. Study classifies exceptional surgeries on specific links.
problem Classifying exceptional Dehn surgeries on specific links.
method Examined minimally twisted seven-chain links.
result Classified all exceptional Dehn surgeries on the links.
We construct nontrivial roots of Dehn twists about nonseparating curves.
Boundary Dehn twists become trivial after abelianization.
problem Understanding the behavior of boundary Dehn twists in smooth mapping classes.
method Constructing diffeomorphisms and showing commutators represent boundary Dehn twists.
result Boundary Dehn twists become trivial after abelianization.
Study on four-dimensional Dehn twists and Milnor fibrations, revealing new phenomena.
problem Understanding the monodromy of Milnor fibrations of surface singularities.
method Using Seiberg-Witten invariant and monopole Floer homology.
result Infinite order non-triviality results for boundary Dehn twists.
Study shows exotic Dehn twists on certain 3-sphere fillings.
problem Extending group actions from boundaries to interiors of 4-manifolds.
method Analyzing Dehn twists on Seifert homology spheres and their fillings.
result Dehn twists on certain fillings are infinite order exotic.
Identifying parallel sides of a collection of Euclidean polygons yields a flat surface with cone points of angles multiples of 2 pi, naturally a compact Riemann surface but also an algebraic curve, and a hyperbolic surface. In general two different metrics on a surface have no geodesic arcs in common, but in special ca…
The study examines Heegaard splittings defined by Dehn twists and finds hyperbolic metrics with specific geodesic lengths.
problem Characterizing Heegaard splittings defined by Dehn twists and their geometric properties.
method Examining Heegaard splittings of genus g≥3 defined by the n-th power of a Dehn twist along a pared acylindrical curve. result For n≥14, the Heegaard splitting has a hyperbolic metric with a closed geodesic of length between 0.7/(n2g2) and 34.3/n2. Study on roots of Dehn twists on nonorientable surfaces.
problem Investigate roots of Dehn twists on nonorientable surfaces.
method Explore existence, conjugacy classes, and maximal degree roots of Dehn twists.
result Prove existence of roots of degree n for sufficiently large g.