W. Niu

collaborators

7 papers

math.GT2026

Embedded surfaces with trivial extendable mapping class groups in simply connected $4$ -manifolds

Weizhe Niu

For every $g \geq 3$ , every closed, connected, oriented, simply connected smooth $4$ -manifold $X$ , and every knot $K \subset S^{3}$ , we construct infinitely many pairwise topologically…

math.GT2026

Extendable mapping classes of knotted surfaces obtained by rim surgery in $S^{4}$

Weizhe Niu

Let $Σ_{g}^{0} \subset S^{4}$ , $g \geq 3$ , be the standard unknotted closed oriented surface, and let $a \subset Σ_{g}^{0}$ be an oriented nonseparating curve. For every nontrivial knot $J\subset…

math.GT2026

Image nonconcordance of positive-genus $I ¨ _{1}$ -injective surfaces

Weizhe Niu

We construct, for every $g \geq 2$ , infinite families of homotopic smooth embeddings of a closed genus- $g$ surface whose images are pairwise not smoothly image-concordant, while eac…

hep-ex2026

Evidence of $I ¨ (3770) \to I ¨ ^{0} J / I ¨ $

BESIII Collaboration, M. Ablikim, M. N. Achasov +766

We report the first evidence for the hadronic transition $I ¨ (3770) \to I ¨ ^{0} J / I ¨ $ using a data sample of $20.3 fb^{- 1}$ collected at $s = 3.773$ ~GeV with the BESIII…

math.GT2026

Triple torsion, triple cup products, and embedding obstructions for rational homology 3-spheres

Weizhe Niu

Freedman and Krushkal introduced a triple torsion linking form for rational homology $3$ -spheres and used it to obstruct locally flat embeddings in $S^{4}$ . For every odd prime $p$ ,…

math.GT2026

Brunnian spanning 3-disks for the 2-unlink in the 4-sphere

Weizhe Niu

We show that the $2$ -component unlink in $S^{4}$ admits infinitely many isotopy classes of spanning $3$ -disks that are Brunnian.

Embedded surfaces with trivial extendable mapping class groups in simply connected 4-manifolds

Extendable mapping classes of knotted surfaces obtained by rim surgery in S4

Image nonconcordance of positive-genus I¨1​-injective surfaces

Evidence of I¨(3770)→I¨0J/I¨

Triple torsion, triple cup products, and embedding obstructions for rational homology 3-spheres

Brunnian spanning 3-disks for the 2-unlink in the 4-sphere

Embedded surfaces with trivial extendable mapping class groups in simply connected $4$ -manifolds

Extendable mapping classes of knotted surfaces obtained by rim surgery in $S^{4}$

Image nonconcordance of positive-genus $I ¨ _{1}$ -injective surfaces

Evidence of $I ¨ (3770) \to I ¨ ^{0} J / I ¨ $