var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-15"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-13"><img src="//www2.math.ethz.ch/smsjs/images/arrow_right.png"/></a></div>    <div class="sms_title">      <span style="float: left;">SMS</span>      <span>SWISS MATHEMATICAL SOCIETY</span>      <span style="float: right;">SMG</span>    </div>    <div class="sms_info">      <span style="float: left; width: 250px;">Bulletin no. 4</span>      <span style="float: right; text-align:right; width: 250px;">12.1 - 16.1.2026</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Winter Break 2025/26</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, January 12      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Filip  Zivanovic  (Stony Brook University)</div><div class="event_title">Modified necklace Lie bialgebras & quartic BV structures in supercategories <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this talk, I will present the computation of algebraic multiplicities in Hilbert schemes of points on certain symplectic surfaces S. These spaces arise as Moduli spaces of Higgs bundles, and in the conjectural Kapustin-Witten mirror symmetry of these spaces, these multiplicities show up naturally, hence the motivation for this work.On the other hand, we also compute the Floer-theoretic filtration, previously connected to the multiplicities for these surfaces S themselves, realising that in their Hilbert schemes, these two invariants somewhat diverge from each other, discovering different geometric data of the space. Joint work with Alexandre Minets. </div><div class="event_time">10:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.unil.ch/dsa/en/home/menuinst/seminaires--evenements/research-seminars.html">Talks in Actuarial Mathematics </a></div><br /><div class="event_speaker"> Patrick  Wong  (Monash University)</div><div class="event_title">Valuation of variable annuities in a general stochastic environment <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This paper develops an advanced analytical framework for pricing Guaranteed Minimum Maturity Benefits (GMMB) within a stochastic environment featuring general dependencies. The model assumes stochastic dynamics for jump intensity, interest rates, and volatility, explicitly incorporating interdependencies among these risk factors. A significant contribution of this research is the derivation of analytical, closed-form solutions for pricing, as well as the computation of first, second, and mixed (cross) sensitivities to model parameters. These higher-order derivatives are obtained efficiently using the derivative of the matrix exponential. Despite the high flexibility of the model, our method ensures that both pricing and risk management remain computationally efficient.</div><div class="event_time">11:00 &bull; EPF Lausanne, Extranef 125</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, January 13      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/annonces/seminaire-danalyse-numerique">Séminaire d\'Analyse Numérique </a></div><br /><div class="event_speaker"> Michael Tretyakov (Nottingham)</div><div class="event_title">Well-posedness, approximation and applications of reflected McKean-Vlasov SDEs <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We establish well-posedness of reflected McKean-Vlasov SDEs and their particle approximations in smooth non-convex domains. We prove convergence of the interacting particle system to the corresponding mean-field limit with the optimal rate of convergence. We motivate this study by applications to sampling via reflected mean-field Langevin SDEs and optimization via reflected consensus-based optimization (CBO) models. We utilize reflection coupling to study long-time behaviour of reflected mean-field SDEs and investigate convergence of the reflected CBO models to the global minimum of a constrained optimization problem. Results of several numerical tests for CBO models are presented. The talk is based on a joint work with Piers Hinds and Akash Sharma.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Yan  Zhou  (Tsinghua University)</div><div class="event_title">Crystals arising from the geometry of spectral curves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We associate a family of classical spectral curves to certain quantum differential equations with irregular singularities. In a maximally degenerate scaling regime—the caterpillar limit—these curves admit a global description governed by Gelfand–Tsetlin patterns. Using periods of natural cycles on the curves, we explain how the type A crystal operators on GT patterns arise geometrically, and how this picture connects to BPS states and spectral networks. Joint work in progress with Andrew Neitzke and Xiaomeng Xu.</div><div class="event_time">15:30 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, January 14      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Manan  Bhatia  (MIT)</div><div class="event_title">Title T.B.A.</div><div class="event_time">10:00 &bull; <a class="external" href="https://epfl.zoom.us/j/64760245142?pwd=xzCAsPRbcfaDggDDStAzaeXk9HbaVg.1">EPF Lausanne, Zoom</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Dr. Ajith Urundolil Kumaran (MIT)</div><div class="event_title">Enumerative geometry of (C*)^2 and the double double ramification cycle <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We introduce the enumerative geometry of (C*)^2 and connect it with intersection numbers against the higher rank double ramification cycle. A certain all genus generating function of these enumerative/virtual invariants with top lambda class insertion can be explicitly calculated using a refined tropical correspondence theorem (joint work with Patrick Kennedy-Hunt and Qaasim Shafi). This generalizes the refined tropical correspondence theorem of Pierrick Bousseau. We will report on joint work in progress with Dylan Toh on a tropical correspondence theorem in genus 1 without a top lambda class insertion.</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room E E1.2</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker"> Aitor Iribar López (ETH Zürich)</div><div class="event_title">Intersection theory on degenerating abelian schemes <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss work in progress with Bae, Feusi and Molcho on the foundations of intersection theory on the universal family of deegeneratin abelian varieties over Mumford\'s partial compactifications. I will give an overview of intersection theory on an abelian scheme using Fourier transforms and Beauville\'s weigh decomposition, and then explain how these techinuqes can be extended to the singular fibers. As a consequence, we obtain a formula for the class of the zero section using previous work of Grushevsky-Zakharov, and a collection of relations in the tautological ring</div><div class="event_time">15:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.1</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Akshay  Sakanaveeti  (North Carolina)</div><div class="event_title">Title T.B.A.</div><div class="event_time">15:00 &bull; <a class="external" href=" https://epfl.zoom.us/j/64196363217?pwd=zvKsGLaeYhiD99JUue52eGV463ZX2e.1">EPF Lausanne, Zoom</a></div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, January 15      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Michael  Hofstetter  (Weizmann)</div><div class="event_title">Title T.B.A.</div><div class="event_time">08:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Nikolay  Ebel  (IHES)</div><div class="event_title">Some steps toward exact critical RG fixed point <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Is there an exact (truncation-free) tensor RG map that has a fixed point corresponding to the 2D critical Ising model and is well-defined in its neighborhood? In this talk, I will review two recently developed techniques that make this question approachable: rotation-modified RG maps and hat-tensors. First, I will explain how incorporating rotation into the RG map enables the use of the Newton method. This allows for a more efficient numerical search for tensor RG fixed points and paves the way for applying the Earle-Hamilton theorem to prove the existence of fixed points. Then, I will present hat-tensors and hat-RG maps, which allow us to track finite-dimensional “bounding boxes” for infinite-dimensional tensors. The talk is based on [2408.10312] and [2506.03247].  </div><div class="event_time">09:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Johanna  Weinberger  (Technion)</div><div class="event_title"> Super-Brownian motion with irregular drift</div><div class="event_time">10:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://calendar.google.com/calendar/embed?mode=AGENDA&height=600&wkst=2&bgcolor=%23FFFFFF&src=t36it03v52cus2detrvinlgk18%40group.calendar.google.com&color=%235F6B02&ctz=Europe%2FZurich">Groups, Arithmetic and Algebraic Geometry Seminar </a></div><br /><div class="event_speaker"> Christopher  Smyth  (University of Edinburgh)</div><div class="event_title">Spectral structures arising from integer polynomials <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In 1979 David Boyd conjectured that the set of Mahlermeasures of polynomials with integer coefficients forms a closed subset of thereal line.In the first part of the talk I’ll outline the origins and basicfacts about Mahler measure, as well as formulae for specific measures, and themotivation behind Boyd’s conjecture. I’ll then discuss a recent stronger conjecture than Boyd’s,which relates the set of these Mahler measures to other spectral sets of knownstructure, also coming from integer polynomials.(30 minutes general talk, followed by 45minutes of more specialized talk) </div><div class="event_time">14:15 &bull; EPF Lausanne, CM 1 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Lukas  Grafner  (Warwick)</div><div class="event_title"> Energy solutions and (super-)critical singular S(P)DEs <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this talk I will give an overview over recent progress in the understanding of certain singular stochastic dynamics in the so-called scaling-critical and -supercritical regime. Our approach centers around energy solutions as introduced by Jara, Gonçalves and Gubinelli. Leveraging the underlying Markov structure, we prove weak unique solvability of such solutions for certain SPDEs such as critical stochastic surface quasigeostrophic equations and the critical fractional 1-Dstochastic Burgers equation. The solutions are diffusively scaling-invariant and non-Gaussian as processes. We will further point to several more recent robustifications of this method regarding the structure of the underlying equation.We also develop a theory of energy solutions in the finite-dimensional setting of SDEs with distributional drift and show weak well-posedness of such solutions for drifts which lie in certain supercritical Besov spaces with negative regularity and can have even more singular but local blow-ups.Moreover, we construct the 1-D self-repelling Brownian polymer (SRBP) which is formally the solution to an SDE with path-dependent distributional drift: the negative gradient of the local time of the solution. This is achieved by rigorously establishing a certain transformation of the SDE to an SPDE that can be uniquely solved in the sense of energy solutions. We then give a dynamic characterization of the SRBP and show that it is superdiffusive and “nowhere self-avoiding”.Based on joint works with Harry Giles, Nicolas Perkowski and Shyam Popat.</div><div class="event_time">16:00 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, January 16      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker">  James  Coe  (Edinburgh)</div><div class="event_title"> tba</div><div class="event_time">08:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker">  Francis  Lörler (Bonn)</div><div class="event_title">Non-reversible Lifts of Reversible Diffusions and Hypocoercivity <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We introduce a new concept of lifts of reversible diffusion processes and show that various well-known non-reversible Markov processes arising in applications are lifts in this sense of simple reversible diffusions. Furthermore, we show that non-asymptotic relaxation times can at most be reduced by a square root through lifting, generalising a related result in discrete time. Finally, we demonstrate how quantitative hypocoercivity can be obtained for second-order lifts based on a time-integrated Poincaré inequality, and how this can be applied to find optimal lifts.</div><div class="event_time">09:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Francesco  Triggiano  (SNS/Pisa)</div><div class="event_title">Title T.B.A.</div><div class="event_time">10:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Jonathan  Junné  (TU Delft)</div><div class="event_title">Quantitative concentration of empirical measures on complete manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We derive quantitative concentration bounds for empirical measures of independent samples in Wasserstein distance on complete Riemannian manifolds under curvature assumptions, and we highlight key differences with the Euclidean setting. As an application, we consider aggregation–diffusion particle approximations on manifolds.</div><div class="event_time">11:30 &bull; <a class="external" href=" ">EPF Lausanne, Bernoulli Center</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Dr. Francesca Carocci (Roma Tor Vergata)</div><div class="event_title">Correlated Gromov-Witten invariants & DR cycle formula I <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this first talk, we will talk about a geometricrefinement for log Gromov -Witten invariants of P^1-bundles on smoothprojective varieties, called correlated Gromov-Witten invariants,introduced in a joint work with T. Blomme. In order to compute them, weproved a correlated refinement of Pixton double-ramification cycleformula with target varieties. We will state the formula and try to give an idea of how it is obtained as an application of the Universal DR formula of Bae-Holmes-Pandharipande-Schmitt-Schwarz.</div><div class="event_time">16:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room D 3.2</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Dr. Thomas Blomme (Universite de Neuchatel)</div><div class="event_title">Correlated Gromov-Witten invariants & DR cycle formula II <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Abelian surfaces are complex tori whose enumerativeinvariants seem to satisfy remarkable regularity properties. Thecomputation of their reduced Gromov-Witten invariants in the case ofprimitive classes has already been well studied with many completecomputations by Bryan-Oberdieck-Pandharipande-Yin. A few years ago, G.Oberdieck conjectured a multiple cover formula expressing in a verysimple way the invariants for the non-primitive classes in terms of theprimitive one. This would close the computation of GW invariants forabelian surfaces. In this second talk, we aim to explain how correlated invariants naturally show up in the decomposition formula for abelian surfaces, and how they allow to prove the multiple cover formula conjecture for many instances. This is joint work with F. Carocci.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room D 3.2</div>        </div>      </div>    </div>  </div>  <div id="sms_footer">    address: Alessandra Naldi Windler, Departement Mathematik, HG G 51.4, ETH Zurich, Raemistrasse 101, CH-8092 Zurich<br />    email: <a href="mailto:bulletin@math.ch">bulletin@math.ch</a> | phone: +41 44 632 3684 | url: <a href="https://math.ch">https://math.ch</a>    <br /><br /><img src="//www2.math.ethz.ch/smsjs/sms_logo.gif" width="150" alt="SMS/SMG Logo" title="SMS/SMG Logo" />  </div></div>';