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<h2>cvgmt weekly bulletin</h2>
<p><i>Weekly bulletin for <a href="http://cvgmt.sns.it">http://cvgmt.sns.it</a></i></p>
<h2>Summary</h2>
<p><b>Seminars by:</b> <a href='/seminar/989/'>Wickramasekera</a></p>
<p><b>New papers by:</b> <a href='/person/4867/' >Sciaraffia</a>, <a href='/person/2059/' >Kreutz</a>, <a href='/person/3986/' >Novack</a>, <a href='/person/2068/' >Carioni</a>, <a href='/person/27/' >Cavalletti</a>, <a >Pastewka</a>, <a >Wang</a>, <a >Da Silva</a>, <a href='/person/2719/' >Semola</a>, <a >Banerjee</a>, <a href='/person/6049/' >Tsiamis</a>, <a >Ganguly</a>, <a href='/person/2990/' >Dondl</a>, <a >Silvestre</a>, <a href='/person/177/' >Nardulli</a>, <a href='/person/1714/' >Caroccia</a>, <a >Schönberger</a>, <a href='/person/4539/' >Iglesias</a>, <a href='/person/6075/' >Firester</a>, <a href='/person/6331/' >Ziereis</a>, <a href='/person/3649/' >Resende</a>, <a href='/person/965/' >Mondino</a>, <a href='/person/6346/' >Sahu</a>, <a >Julin</a>, <a >Vestberg</a>, <a href='/person/1753/' >De Rosa</a>, <a >Jesus</a>, <a >Manini</a>, <a href='/person/5732/' >Del Grande</a>, <a href='/person/103/' >Cagnetti</a>, <a href='/person/5738/' >Agnoletto</a>, <a href='/person/4847/' >Giovagnoli</a>, <a href='/person/116/' >Barchiesi</a>, <a href='/person/4346/' >Ambrosio</a></p>
<p><b>Modified papers by:</b> <a href='/person/3843/'>Schulz</a>, <a href='/person/6535/'>Chen</a>, <a >Demason </a>, <a href='/person/4241/'>Gennaioli</a>, <a href='/person/27/'>Cavalletti</a>, <a href='/person/1820/'>Jevnikar</a>, <a href='/person/2591/'>Fässler</a>, <a href='/person/6056/'>Alasio</a>, <a href='/person/3629/'>Ciani</a>, <a href='/person/4142/'>De Gennaro</a>, <a href='/person/2808/'>Carbotti</a>, <a href='/person/1714/'>Caroccia</a>, <a href='/person/1982/'>Rindler</a>, <a href='/person/193/'>Cupini</a>, <a href='/person/5059/'>Zambanini</a>, <a href='/person/965/'>Mondino</a>, <a href='/person/4807/'>Carducci</a>, <a href='/person/201/'>Santambrogio</a>, <a href='/person/336/'>Velichkov</a>, <a href='/person/1753/'>De Rosa</a>, <a href='/person/239/'>Maggi</a>, <a href='/person/3825/'>Yang</a>, <a href='/person/6002/'>Lin</a>, <a href='/person/125/'>Van Goethem</a>, <a >Gu</a>, <a href='/person/4346/'>Ambrosio</a>, <a href='/person/5245/'>Gambicchia</a></p>
<h2>Events next week</h2>
<ul>
<li><p>
<b><a href='/event/1076/'>17th Panhellenic Geometry Conference</a></b><br />
Fri 18 September 2026 - Sun 20 September 2026<br />
University of Patras<br />
</p></li>
<li><p>
<b><a href='/event/1117/'>Curvature, Optimal Transport, and Gravity</a></b><br />
Mon 21 September 2026 - Fri 25 September 2026<br />
Faculty of Mathematics - University of Vienna<br />
</p></li>
</ul>
<h2>Seminars next week</h2>
<h3>Tue 22 September 2026</h3><ul>
<li><p>
Agenda: Get-together (30 min), presentation Neshan Wickramasekera (60 min), questions and discussions (30 min).<br />
Neshan Wickramasekera: <b><a href='/seminar/989/'>Planar frequency, asymptotic normal forms, and local topology of area-minimizing currents</a></b><br />
, 08:00<br />
</p>
<div style="font-size: smaller;"><p>A fundamental problem in geometric measure theory is to understand the local structure of $n$-dimensional area-minimizing rectifiable currents $T$ of codimension at least 2. Almgren's 1983 theory provides a powerful general framework establishing the sharp Hausdorff dimension upper bound $n-2$ for the singular set (subsequently made more accessible by De Lellis–Spadaro). The work of White, Chang, and Micallef–White gives a remarkably complete structure theory when $T$ is 2-dimensional, in which case the singularities are isolated. In higher dimensions, however, the local structure of $T$ and the nature of its singularities remain much more subtle, particularly at branch points, where one tangent cone is a plane.
In a series of papers with Brian Krummel, we develop a new framework for this problem in arbitrary dimension $n$. Its geometric philosophy differs from the classical theory: it unifies decay estimates at branch points with the dimension and structure of the singular set, as well as with the structure of $T$. A central conceptual novelty is the introduction of a new intrinsic frequency function, called the planar frequency. Unlike the frequency used in the classical theory, planar frequency is defined directly in terms of geometric quantities integrated over the current, without first constructing auxiliary center manifolds at branch points. The approximate monotonicity of planar frequency provides quantitative control of the rate at which $T$ approaches planes and leads to a natural decomposition of the singular set according to planar decay.
I will describe this framework and some of its main consequences. Among these are a more direct proof of Almgren's $n-2$ bound, $H^{n-2}$-almost everywhere uniqueness of tangent cones, and a detailed asymptotic description of $T$ at typical branch points. In particular, at $H^{n-2}$-almost every branch point $Z$ there is a unique tangent plane, an intrinsic rational invariant—the branching order $O_T(Z)>1$—and a unique, nonzero, $O_T(Z)$
-homogeneous cylindrical multi-valued tangent function. Together, these provide an asymptotic normal form for $T$ at $Z$ with quantitative decay for the remainder. Corollaries of this normal form include a locally finite decomposition of the singular set into disjoint, locally compact, locally $n-2$-rectifiable sets with locally finite $H^{n-2}$ measure, and a sharp branching order criterion under which a branch point $Z$ is classical; that is, near $Z$, the support of $T$ is homeomorphic to an $n$-disk and admits a $C^{1,\mu}$ parameterization, while the entire singular set is an $n-2$-dimensional $C^{1,\mu}$ submanifold consisting only of branch points with the same density and branching order as $Z$. This is a natural higher-dimensional analogue of the Chang–Micallef–White structural description in dimension 2.
A central theme of the talk will be how planar frequency avoids the need to construct center manifolds uniformly across all branch points as in the classical framework. Instead, it identifies precisely the regime in which a center manifold becomes necessary and reduces its use to a canonical case. This reduction is crucial for our asymptotic normal form and also leads to substantial technical simplifications over the classical approach.
I will also briefly comment on related contemporaneous work of De Lellis, Minter, and Skorobogatova.</p>
</div>
</li>
</ul>
<h2>New Papers</h2>
<p><b> Caroccia:</b> <a href='/paper/7974/'>From $BV^\mathcal A$ to $BV$: An endpoint Korn estimate</a></p>
<p><b> Ambrosio, Vestberg:</b> <a href='/paper/7975/'>Boundedness and contractive estimates for orthotropic, widely degenerate, doubly nonlinear diffusion equations</a></p>
<p><b> Cavalletti, Manini, Mondino:</b> <a href='/paper/7976/'>The Null Energy Condition through the Lens of Optimal Transport: Smooth and Non-Smooth Spacetimes</a></p>
<p><b> Barchiesi, Cagnetti, Julin:</b> <a href='/paper/7977/'>Double-arc rearrangement and the symmetric isoperimetric problem in Gauss space</a></p>
<p><b> Dondl, Pastewka, Sciaraffia, Wang:</b> <a href='/paper/7978/'>A capillary problem, its dimension reduction, and its phase-field approximation</a></p>
<p><b> Agnoletto, Da Silva, Nardulli, Resende:</b> <a href='/paper/7979/'>A proof of the Cartan-Hadamard conjecture for small volumes under a Ricci curvature lower bound</a></p>
<p><b> Semola:</b> <a href='/paper/7980/'>Ricci curvature, fundamental groups, and the Jordan property</a></p>
<p><b> Novack, Resende:</b> <a href='/paper/7981/'>Existence of flat blowups at boundary points of anisotropic minimizing hypercurrents</a></p>
<p><b> Carioni, Del Grande, Iglesias, Schönberger:</b> <a href='/paper/7982/'>From plans to maps: Nonlocal regularization of optimal transport</a></p>
<p><b> De Rosa, Firester, Tsiamis:</b> <a href='/paper/7983/'>Regularity of varifolds with bounded anisotropic first variation</a></p>
<p><b> Giovagnoli, Jesus, Silvestre:</b> <a href='/paper/7984/'>Hölder gradient estimates for fractional $p$-caloric functions</a></p>
<p><b> Sahu:</b> <a href='/paper/7985/'>Improved quantitative stability for the critical Hardy inequality</a></p>
<p><b> Banerjee, Ganguly, Sahu:</b> <a href='/paper/7986/'>Quantitative stability for fractional Hardy inequalities: Rearrangement-free techniques and Emden-Fowler analysis</a></p>
<p><b> Sahu:</b> <a href='/paper/7987/'>Trudinger–Moser type inequality in fractional Sobolev space with singularity on smooth submanifold</a></p>
<p><b> Kreutz, Ziereis:</b> <a href='/paper/7988/'>The charge dependent hard-sphere model: Polycrystals as low-energy configurations</a></p>
<h2>Modified Papers</h2>
<p><b> Carducci, Velichkov:</b> <a href='/paper/6960/'>Existence and regularity in the fully nonlinear one-phase free boundary problem</a></p>
<p><b> Caroccia, Van Goethem:</b> <a href='/paper/7061/'>Iterative blow-ups for maps with bounded $\mathcal{A}$-variation: a refinement, with application to $\mathrm{BD}$ and $\mathrm{BV}$.</a></p>
<p><b> Caroccia, Van Goethem:</b> <a href='/paper/7142/'>Rigidity and functional properties of $\mathrm{BD}_{dev}(\Omega)$</a></p>
<p><b> Caroccia, Demason , Maggi:</b> <a href='/paper/7294/'>On the emergence of almost-honeycomb structures in low-energy planar clusters</a></p>
<p><b> Gambicchia:</b> <a href='/paper/7298/'>The double spherical cap rearrangement of planar sets</a></p>
<p><b> De Gennaro, De Rosa:</b> <a href='/paper/7374/'>Non-polyconvex $Q$-integrands with lower semicontinuous energies</a></p>
<p><b> Lin, Santambrogio:</b> <a href='/paper/7541/'>Existence of a solution of the TV Wasserstein gradient flow</a></p>
<p><b> Ambrosio, Ciani, Cupini:</b> <a href='/paper/7676/'>Widely degenerate anisotropic diffusion: local boundedness and semicontinuity</a></p>
<p><b> Alasio, Schulz:</b> <a href='/paper/7753/'>Regularity and Uniqueness for a Model of Active Particles with Angle-Averaged Diffusions</a></p>
<p><b> Gu, Jevnikar, Yang:</b> <a href='/paper/7797/'>Isolated Singularities for Fractional Hartree Equations</a></p>
<p><b> Cavalletti, Mondino:</b> <a href='/paper/7798/'>A singularity theorem in terms of asymptotic expansion</a></p>
<p><b> Gennaioli, Rindler:</b> <a href='/paper/7940/'>Concentration phenomena and the Vanishing Mass Conjecture</a></p>
<p><b> Carbotti:</b> <a href='/paper/7951/'>The semigroup generated by linear fractional divergence form operators in $L^p(\mathbb{R}^N)$: the constant coefficient case</a></p>
<p><b> Chen, Fässler, Zambanini:</b> <a href='/paper/7955/'>On low-dimensional uniform rectifiability in Heisenberg groups - Part 2</a></p>
<h2>Open Positions</h2>
<p><a href="/position/1137/">Assistant / Associate / Full Professor at Imperial College London</a> (deadline: Sun 20 September 2026)</p>
<p><a href="/position/1150/">Two 1-year Postdoctoral Positions at the Department of Mathematics, University of Padua</a> (deadline: Tue 29 September 2026)</p>
<p><a href="/position/1140/">Full Professorship in Mathematics (W3) Bridging the Gaps Chair</a> (deadline: Wed 30 September 2026)</p>
<p><a href="/position/1141/">Associate Professorships in Mathematics (W2) - 5 years</a> (deadline: Wed 30 September 2026)</p>
<p><a href="/position/1142/">Expression of Interest: Prospective PhD Position in Discrete Structures in Fluid Dynamics</a> (deadline: Wed 30 September 2026)</p>
<p><a href="/position/1143/">Expression of Interest: PhD Position in Geometric Analysis and Nonlinear PDEs at Universitat de València</a> (deadline: Wed 30 September 2026)</p>
<p><a href="/position/1149/">PhD position at JKU Linz</a> (deadline: Fri 2 October 2026)</p>
<p><a href="/position/1138/">2x ERC PostDoc positions at Pisa (2 + 1 years) "Deep questions at the intersection of PDEs, GMT, Calculus of Variations, and Harmonic Analysis."</a> (deadline: Mon 5 October 2026)</p>
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