B. J. Wuebben

collaborators

8 papers

math.AG2026

Doubly isolated Batyrev mirror pairs and non-smoothable Calabi-Yau threefolds

Bernd Johannes Wuebben

We classify reflexive four-polytopes for which the generic anticanonical hypersurfaces associated with the face fans of the polytope and its polar both have at most isolated singul…

math.AG2026

Deformations of toric pairs and the smoothing of Batyrev Calabi-Yau threefolds

Bernd Johannes Wuebben

Let $Δ$ be a reflexive four-polytope with primitive edges. We construct deformations of the toric fourfold defined by its face fan that smooth the singularities of a generic antica…

math.AG2026

Non-smoothable Calabi-Yau threefolds from reflexive polytopes

Bernd Johannes Wuebben

We construct projective Calabi-Yau threefolds with isolated Gorenstein canonical singularities that admit no smoothing, as anticanonical hypersurfaces in Gorenstein Fano toric four…

math.GM2026

Toward an exotic $S^{2} \times S^{2}$ and an exotic $CP^{2} # CP^{2}$

Bernd Johannes Wuebben

We study a specified Luttinger filling in the construction of Lidman and Piccirillo whose simple connectivity would yield exotic $S^{2} \times S^{2}$ and $\mathbb{CP}^2\#\overline{\math…

math.GT2026

Instanton and pillowcase homology of the $(- 2, 3, q)$ pretzel knots

Bernd Johannes Wuebben

Hedden, Herald and Kirk conjectured that every knot admits a decomposition along a Conway sphere for which the Lagrangian Floer homology of the two associated immersed curves in th…

math.GT2026

Traceless $SU (2)$ characters and $Z /4$ instanton gradings for two-bridge and $(3, n)$ -torus knots

Bernd Johannes Wuebben

For every torus knot, the rank of the differential of the Daemi-Scaduto S-complex of singular instanton homology is determined by the signature and the Alexander polynomial; this f…

math.DG2026

Slope stability of tangent bundles of smooth toric Fano varieties

Bernd Johannes Wuebben

We construct smooth toric Fano $n$ -folds of Picard number $n + 2$ whose tangent bundles are slope-stable with respect to the anticanonical polarization, for every $n \geq 4$ . The constr…

q-fin.PM2026

Beyond De Prado and Cotton: Hierarchical and Iterative Methods for General Mean-Variance Portfolios

Bernd Johannes Wuebben

Hierarchical Risk Parity (De Pardo) and the Schur-complement generalization of Cotton are among the most widely adopted regularised portfolio construction methods, yet both are sig…

Doubly isolated Batyrev mirror pairs and non-smoothable Calabi-Yau threefolds

Deformations of toric pairs and the smoothing of Batyrev Calabi-Yau threefolds

Non-smoothable Calabi-Yau threefolds from reflexive polytopes

Toward an exotic S2×S2 and an exotic CP2#CP2

Instanton and pillowcase homology of the (−2,3,q) pretzel knots

Traceless SU(2) characters and Z/4 instanton gradings for two-bridge and (3,n)-torus knots

Slope stability of tangent bundles of smooth toric Fano varieties

Beyond De Prado and Cotton: Hierarchical and Iterative Methods for General Mean-Variance Portfolios

Toward an exotic $S^{2} \times S^{2}$ and an exotic $CP^{2} # CP^{2}$

Instanton and pillowcase homology of the $(- 2, 3, q)$ pretzel knots

Traceless $SU (2)$ characters and $Z /4$ instanton gradings for two-bridge and $(3, n)$ -torus knots