Brieskorn manifolds as contact branched covers of spheres
Ferit Ozturk, Klaus Niederkrüger
证明了具有标准切触结构的Brieskorn流形是球面的切触分支覆盖。这个覆盖映射的Brieskorn流形的接触开书分解到一个Milnor开书的领域。
We show that Brieskorn manifolds with their standard contact structures are contact branched coverings of spheres. This covering maps a contact open book decomposition of the Brieskorn manifold onto a Milnor open book of the sphere.
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We show that standard cyclic actions on Brieskorn homology 3-spheres with non-empty fixed set do not extend smoothly to any contractible smooth 4-manifold it may bound. The quotient of any such extension would be an acyclic $4$-manifold with boundary a related Brieskorn homology sphere. We briefly discuss well known invariants of homology spheres that obstruct acyclic bounding 4-manifolds, and then use a method based on equivariant Yang-Mills moduli spaces to rule out extensions of the actions.
The Brieskorn manifolds $B(p,q,r)$ are the $r$-fold cyclic coverings of the 3-sphere $S^{3}$ branched over the torus knot $T(p,q)$. The generalised Sieradski groups $S(m,p,q)$ are groups with $m$-cyclic pre\-sen\-tation $G_{m}(w)$, where defining word $w$ has a special form, depending of $p$ and $q$. In particular, $S(m,3,2) = G_{m}(w)$ is the group with $m$ generators $x_{1}, \ldots, x_{m}$ and $m$ defining relations $w(x_{i}, x_{i+1}, x_{i+2})=1$, where $w(x_{i}, x_{i+1}, x_{i+2}) = x_{i} x_{i+2} x_{i+1}^{-1}$. Presentations of $S(2n,3,2)$ in a certain form $G_{n}(w)$ were investigated by Ho…
On the Heegaard Floer homology of branched double-covers
设$L\subset S^3$为链接。我们研究了$S^3$的分支双覆盖$Σ(L)$的Heegaard弗洛尔同调，沿着$L$分支。当$L$是交替连接时，其分支双覆盖的$\HFa$具有特别简单的形式，完全由连接的行列式确定。对于一般情况下，我们推导出一个谱序列的$E^2$项是一个合适的变体Khovanov的同源性的链接$L$，收敛到Heegaard弗洛尔同调的$Σ(L)$。
On Transverse Knots and Branched Covers
我们研究接触流形出现的循环分支覆盖的横向结在标准的接触3-球面。我们讨论这些接触流形的性质，并描述他们在开放的书籍和接触手术。在许多情况下，我们表明，这样的分支覆盖接触形态的光滑同位素横结具有相同的自环绕数。这些纽结对包括Birman-Menasco和Ng-Ozsvath-Thurston的大多数非横截简单纽结。
Hyperelliptic Lefschetz fibrations and branched covering spaces
设M是光滑的4-流形，且在2-球面上存在相对极小的超椭圆亏格h-Lefschetz纤维化.如果这个纤维化的所有消失圈都是非分离曲线，那么我们证明了M是2-球面上的2-球面丛的2-重覆盖，在嵌入曲面上分支。如果这个纤维化的消失周期的集合包括分离曲线，我们表明，M是一个Lefshetz纤维化N的相对最小化，与N的2倍分支覆盖的理性表面，分支的嵌入式表面。
Loi and Piergallini showed that a smooth compact, connected $4$-manifold $X$ with boundary admits a Stein structure if and only if $X$ is a simple branched cover of a $4$-disk $D^4$ branched along a positive braided surface $S$ in a bidisk $D_{1}^{2} \times D_{2}^{2} \approx D^4$. For each integer $N \geq 2$, we construct a braided surface $S_{N}$ in $D^4$ and simple branched covers $X_{N, 1}, X_{N, 2}, \dots , X_{N, N}$ of $D^{4}$ branched along $S_{N}$ such that the covers have the same degrees, and they are mutually diffeomorphic, but the Stein structures associated to the covers are mutual…
In this paper, we determine the Euler characteristics and signatures of the exact symplectic fillings of the contact double, 3-fold or 4-fold cyclic covers of the standard contact 3-sphere branched over certain transverse quasi-positive links. These links include all quasi-positive knots with crossing numbers smaller than 11 and all quasi-positive links with crossing numbers smaller than 12 and nonzero nullity.
Computing Knot Floer Homology in Cyclic Branched Covers
我们使用网格图给出了一个计算纽结K在其m重循环分支覆盖Sigma^m（K）中拉回的纽结弗洛尔同调的组合算法，并且当m=2时，我们给出了50多个三桥纽结的计算结果，最多可达11个交叉点.
Knot concordance and Heegaard Floer homology invariants in branched covers
通过研究S^3中纽结K在其双分支覆盖内的原像的Heegaard弗洛尔同调，我们给出了经典光滑协调群中K具有有穷级的简单障碍.作为应用，我们证明了所有交叉数不超过12且光滑协调阶未知的2-桥纽结都具有无穷光滑协调阶。
Rank inequalities for the Heegaard Floer homology of branched covers
本文研究沿零同调链环分支的二重覆盖，建立了Heegaard Floer同调维数的不等式，并探讨其与L-空间猜想的关系及拓扑应用。
We prove that any closed simply-connected smooth 4-manifold is 16-fold branched covered by a product of an orientable surface with the 2-torus, where the construction is natural with respect to spin structures. In particular this solves Problem 4.113(C) in Kirby's list. We also discuss analogous results for other families of 4-manifolds with infinite fundamental groups.
Lefschetz pencils, branched covers and symplectic invariants
这套讲座的目的是给一个概述唐纳森理论的线性系的辛流形和代数和几何不变量，他们给了。在收集了一些相关的背景知识后，我们讨论了关于射影平面的Lefschetz束和分支覆盖的拓扑、代数和辛观点。后来的讲座讨论通过结合这个理论与伪全纯曲线方法获得的不变量。
Transverse knots, branched double covers and Heegaard Floer contact invariants
给定标准切触3-球面中的一个横链，我们研究了作为球面的一个分支双覆盖而产生的切触流形。我们给出了一个接触手术描述这样的流形，它允许确定Heegaard Floer接触不变量的一些。通过Birman-Menasco的结的例子，我们表明，这些接触流形可能无法区分非同位素的横结。我们还研究了分支双覆盖的Heegaard Floer接触不变量与Khovanov同调之间的关系，特别是我们在相关论文中引入的横链不变量。
A concordance invariant from the Floer homology of double branched covers
Ozsvath和Szabo以Heegaard弗洛尔同调中分级的校正项的形式定义了Froyshov不变量的类似物。应用这一点的双重覆盖的3-球面上的一个结K，我们得到一个不变的三角形结协调。我们表明，三角洲是由交替的结和结多达9个交叉的签名，并推测一个类似的关系，所有的H-薄结。我们还使用delta证明了对于所有的纽结K，当tau（K）>0时，K的正的无扭二重不是光滑的切片。
Khovanov homology and tight contact structures
利用Khovanov同调与分支复盖的Heegaard弗洛尔同调之间的关系，我们证明了Khovanov同调如何用来建立某些横节的分支复盖的紧度.我们给出了几个无限家庭的结的分支覆盖是紧的Khovanov同调的原因的例子，并表明，这些分支覆盖的一些是不斯坦填充。
We provide criteria ensuring that a tunnel number one knot $K$ is not determined by its double branched cover, in the sense that the double branched cover is also the double branched cover of a knot $K'$ not equivalent to $K$.
In this work we characterize branch data of branched coverings of even degree over the projective plane which are realizable by indecomposable branched coverings.
A branched covering surface-knot is a surface-knot in the form of a branched covering over a surface-knot. For a branched covering surface-knot, we have a numerical invariant called the simplifying number. We show that branched covering surface-knots with degree three have the simplifying numbers less than three.
For any alternating knot, it is known that the double branched cover of the $3$-sphere branched over the knot is an $L$-space. We show that the three-fold cyclic branched cover is also an $L$-space for any genus one alternating knot.
Characterising knots by their branched coverings
本文通过循环分支覆盖方法研究结的表征问题，探讨其在结分类中的应用与贡献。
Branched covers of tangles in three-balls
我们给出了一个算法的手术描述的$p$ -折叠循环分支覆盖的$B^3$分支沿缠结。我们推广了Montesinos和Akbulut-Kirby的构造。
Folding Branched Covers of the $3$-Sphere Branched over Knots
本文研究了3-球面在纽结上分支的分支覆盖的折叠映射，证明了循环和二面体分支覆盖均可被折叠，并详细探讨了沿着(2,5)型环面纽结分支的二面体覆盖的折叠。
For any integer n > 2, the n-fold cyclic branched cover M of an alternating prime knot K in the 3-sphere determines K, meaning that if K is a knot in the 3-sphere that is not equivalent to K then its n-fold cyclic branched cover cannot be homeomorphic to M.
Braided embeddings are embeddings to a product disc bundle so the projection to the first factor is a branched cover. In this paper, we study which branched covers lift to braided embeddings, which is a generalization of the Borsuk-Ulam problem. We determine when a braided embedding in the complement of branch locus can be extended over the branch locus in smoothly (or locally flat piecewise linearly), and use it in conjunction with Hansen's criterion for lifting covers. We show that every branched cover over an orientable surface lifts to a codimension two braided embedding in the piecewise l…
We give a formula of 3-dimensional invariant for a cyclic contact branched covering of the standard contact S^{3}.
Examples of knots and links distinguished by the total rank of their Khovanov homology but sharing the same two-fold branched cover are given. As a result, Khovanov homology does not yield an invariant of two-fold branched covers.
We give an explicit formula for a 2-fold branched covering from $\mathbb{CP}^2$ to $S^4$, and relate it to other maps between quotients of $S^2\times{S^2}$.
Transverse knots determined by their cyclic branched covers
本文研究横截结的横截同胚类，通过构造其他非同胚但循环分支覆盖接触同胚的横截结例子，证明许多横截结的横截同胚类由其循环分支覆盖的接触同胚类型决定。
Many three dimensional manifolds are two-fold branched covers of the three dimensional sphere. However, there are some that are not. This paper includes exposition about two-fold branched covers and many examples. It shows that there are three dimensional homology spheres that do not two-fold branched cover any manifold, ones that only two-fold branched cover the three dimensional sphere, ones that just two-fold branched cover a non-trivial manifold, and ones that two-fold branched cover the sphere and non-trivial manifolds. When a manifold is surgery on a knot, the possible quotients via invo…
Given a branched covering of degree d between closed surfaces, it determines a collection of partitions of d, the branch data. In this work we show that any branch data are realized by an indecomposable primitive branched covering on a connected close surface N with Euler's characteristic less than or equal to 0. This shows that decomposable and indecomposable realizations may coexist. Moreover, we characterize the branch data of a decomposable primitive branched covering.
Signatures of links and finite type invariants of cyclic branched covers
最近，Mullins利用琼斯多项式及其签名计算了S^3中定向链环的2重循环分支覆盖的Casson-Walker不变量，假设2重分支覆盖是有理同调3-球面。利用基本原理，我们提供了一个类似的计算一般情况下。此外，我们还利用纽结的Kontsevich积分计算了S^3中扭纽结的p重分支覆盖的LMO不变量。
Strongly-cyclic branched coverings of knots via $(g,1)$-decompositions
利用纽结的（g，1）-分解研究了纽结的强循环分支覆盖。得到了这类覆盖存在唯一的充要条件。证明了它们的基本群具有几何g字循环表示。
A branched covering surface-knot is a surface-knot in the form of a branched covering over an oriented surface-knot $F$, where we include the case when the covering has no branch points. A branched covering surface-knot is presented by a graph called a chart on a surface diagram of $F$. We can simplify a branched covering surface-knot by an addition of 1-handles with chart loops to a form such that its chart is the union of free edges and 1-handles with chart loops. We investigate properties of such simplifications for the case when branched covering surface-knots have a non-zero number of bra…
A branched covering surface-knot over an oriented surface-knot $F$ is a surface-knot in the form of a branched covering over $F$. A branched covering surface-knot over $F$ is presented by a graph called a chart on a surface diagram of $F$. For a branched covering surface-knot, an addition of 1-handles equipped with chart loops is a simplifying operation which deforms the chart to the form of the union of free edges and 1-handles with chart loops. We investigate properties of such simplifications.
We present some non-trivial calculations of Baldwin-Ozsváth-Szabó cohomology of links, and applications to Heegaard-Floer homology of branched double covers.
Cyclic presentations of groups and cyclic branched coverings of (1,1)-knots
本文研究了群的循环表示与（1，1）-纽结的分支循环覆盖之间的关系。特别地，我们证明了（1，1）-纽结的每一个n重强循环分支覆盖都允许亏格为n的Heegaard图编码的基本群的循环表示.
By a construction of Berstein and Edmonds every proper branched cover f between manifolds is a factor of a branched covering orbit map from a locally connected and locally compact Hausdorff space called the monodromy space of f to the target manifold. For proper branched covers between 2-manifolds the monodromy space is known to be a manifold. We show that this does not generalize to dimension 3 by constructing a self-map of the 3-sphere for which the monodromy space is not a locally contractible space.
On cyclic branched coverings of prime knots
本文证明了一个素纽结K对至多两个奇素数p不由它的p重循环分支覆盖所决定，并证明了对给定的奇素数p，素纽结K的p重循环分支覆盖是至多多一个不等价于K的纽结K'的p重循环分支覆盖.为了证明主要定理，还得到了关于纽结对称性的一个结果。后一个结果可以解释为平凡结的一个特征。
We study the question of when cyclic branched covers of knots admit taut foliations, have left-orderable fundamental group, and are not L-spaces.
Using a Heegaard diagram for the pullback of a knot $K \subset S^3$ in its cyclic branched cover $Σ_m(K)$ obtained from a grid diagram for $K$, we give a combinatorial proof for the invariance of the associated combinatorial knot Floer homology over $\mathbb{Z}$.
Lefschetz Fibrations and 3-Fold Branched Covering Spaces
本文作者撤回。更换参见math.GT/9811093。
Using a Heegaard diagram for the pullback of a knot $K \subset S^3$ in its cyclic double branched cover $Σ_2(K)$, we give a combinatorial proof for the invariance of knot Floer homology over $\mathbb{Z}$.
The branched virtual fibering theorem by Sakuma states that every closed orientable $3$-manifold with a Heegaard surface of genus $g$ has a branched double cover which is a genus $g$ surface bundle over the circle. It is proved by Brooks that such a surface bundle can be chosen to be hyperbolic. We prove that the minimal entropy over all hyperbolic, genus $g$ surface bundles as branched double covers of the $3$-sphere behaves like 1/$g$. We also give an alternative construction of surface bundles over the circle in Sakuma's theorem when closed $3$-manifolds are branched double covers of the $3…
In a recent paper Y. Hu has given a sufficient condition for the fundamental group of the r-th cyclic branched covering of S^3 along a prime knot to be left-orderable in terms of representations of the knot group. Applying her criterion to a large class of two-bridge knots, we determine a range of the integer r>1 for which the r-th cyclic branched covering of S^3 along the knot is left-orderable.
The many faces of cyclic branched coverings of 2-bridge knots and links
讨论了3-球面的循环复盖的3-流形，它们在2-桥纽结和2-桥环上分支。不同的描述，这些流形：多面体，Heegaard图，Dehn手术和着色图的建设。利用这些描述，我们给出了他们的基本群，这是循环介绍的情况下，2-桥结的介绍。对广泛的一类情形给出了同调群。证明了2-桥环的每个单圈分支覆盖是确定环的一个双圈分支覆盖和平凡纽结的一个圈分支覆盖的合成。
We prove that for any closed, connected, oriented 3-manifold M, there exists an infinite family of 2-fold branched covers of M that are hyperbolic 3-manifolds and surface bundles over the circle with arbitrarily large volume.
We study simple branched coverings of degree d of the 2- and 3- dimensional sphere branched over oriented links. We demonstrate how to use braid charts to develop embeddings of these into $S^k \times D^2$ for $k=2,3 when $d=2,3$. This is an initial part of our study and represents the manuscript submitted to the RIMS workshop at Intelligence of Low Dimensional Topology.
Negative definite spin filling and branched double covers
本文研究交错结的分支双覆盖的负定自旋填充，推导了此类填充存在的障碍，并基于此给出了特殊交错结的一个刻画。
Decomposability of minimal defect branched coverings over the projective plane
本文刻画了射影平面上最小亏格原始分支覆盖的可分解性，扩展了实现族，并推广了原始置换群的相关结果。
We prove the non-left-orderability of the fundamental group of the $n$-th fold cyclic branched cover of the pretzel knot $P(3,-3,-2k-1)$ for all integers $k$ and $n\ge 1$. These $3$-manifolds are $L$-spaces discovered by Issa and Turner.
We show that if the branched double cover of an alternating link arises as $p/q \in \mathbb{Q} \setminus \mathbb{Z}$ surgery on a knot in $S^3$, then this is exhibited by a rational tangle replacement in an alternating diagram.
In this paper, we introduce a sequence of invariants of a knot K in S^3: the knot Floer homology groups of the preimage of K in the m-fold cyclic branched cover over K. We exhibit the knot Floer homology in the m-fold branched cover as the categorification of a multiple of the Turaev torsion in the case where the m-fold branched cover is a rational homology sphere. In addition, when K is a 2-bridge knot, we prove that the knot Floer homology of the lifted knot in a particular Spin^c structure in the branched double cover matches the knot Floer homology of the original knot K in S^3. We conclud…
Strongly-cyclic branched coverings of (1,1)-knots and cyclic presentations of groups
研究了二次穿孔环面的映射类群、（1，1）-纽结的循环分枝覆盖与群的循环表示之间的关系。通过映射类群的元素，给出了（1，1）-纽结的n重强循环分支覆盖存在唯一的充要条件.我们证明了（1，1）-纽结的每个n重强循环分支覆盖都允许基本群的循环表示，这是由亏格n的Heegaard分裂引起的.此外，我们给出了一个算法，以产生循环表示，并说明它的情况下，循环分支覆盖的环面结类型（k，hk+1）和（k，hk-1）。
We characterize the cyclic branched covers of the 2-sphere where every homeomorphism of the sphere lifts to a homeomorphism of the covering surface. This answers a question that appeared in an early version of the erratum of Birman and Hilden [2].
We give necessary and sufficient conditions for a 4-manifold to be a branched covering of $CP^2$, $S^2\times S^2$, $S^2 \mathbin{\tilde\times} S^2$ and $S^3 \times S^1$, which are expressed in terms of the Betti numbers and the intersection form of the 4-manifold.
We consider branched coverings which are simple in the sense that any point of the target has at most one singular preimage. The cobordism classes of $k$-fold simple branched coverings between $n$-manifolds form an abelian group $Cob^1(n,k)$. Moreover, $Cob^1(*,k) = \bigoplus_{n=0}^{\infty} Cob^1(n,k)$ is a module over $Ω^{SO}_*$. We construct a universal $k$-fold simple branched covering, and use it to compute this module rationally. As a corollary, we determine the rank of the groups $Cob^1(n,k)$. In the case $n = 2$ we compute the group $Cob^1(2,k)$, give a complete set of invariants and co…
Lifting homeomorphisms and finite abelian branched covers of the 2-sphere
本文完全刻画了二维球面上满足每个保持分支集的同胚均可提升的有限阿贝尔正则分支覆盖。
Finite groups acting on 3-manifolds and cyclic branched coverings of knots
我们感兴趣的是有限群作用于3-流形上的定向约束（任意作用，即不一定是自由作用）。特别地，我们考虑了包含非空连通不动点集的对合的有限群。这个条件是满足的等距群的任何双曲循环支覆盖的一个强可逆的纽结，以及等距群的任何双曲2倍支覆盖的纽结在3-球面。本文给出了这类不可解群的一个刻划。然后，我们考虑了一些可能的应用研究的循环分支覆盖的纽结和超椭圆的超同态的3-流形。特别是，我们分析了两个不同的纽结具有相同的循环分支覆盖的基本情况。
Compact Stein surfaces with boundary as branched covers of $\B^4$
证明了当分支集为正辫状曲面时，具有边界的Stein曲面与$\B^4$的简单分支覆盖的保向同构重合.因此，我们有一个光滑的定向3-流形是Stein可填充的当且仅当它有一个正的开卷分解。
In this work we study the decomposability property of branched coverings of degree $d$ odd, over the projective plane, where the covering surface has Euler characteristic $\leq 0$. The latter condition is equivalent to say that the defect of the covering is greater than $d$. We show that, given a datum $\mathscr{D}=\{D_{1},\dots,D_{s}\}$ with an even defect greater than $d$, it is realizable by an indecomposable branched covering over the projective plane. The case when $d$ is even is known.
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