| Saturday 10 May 2025 | |
| Events for day: Wednesday 19 February 2025 |
Winter school on Physics of Complex Fluids PHYSICS Winter school on Physics of Complex Fluids (PCF) School of Physics, IPM February 19-20, 2025 (Esfand 1-2, 1403) The Winter School on Complex Fluids aims to enhance the knowledge of postdoctoral researchers and graduate students, particularly at the doctoral level, in the physics of fluids and complex systems. This program provides an in-depth exploration of the physics of complex fluids and hydrodynamic phenomena in soft and dispersed materials, delivering a solid foundation in these fields. The school covers a diverse range of materials with physical and mechanical properties between those of liquids and ... 11:00 - 12:00 Wednesday Weekly Seminar - Virtual Format Sandwich Quantum Constraints, Strings and Null Branes School PARTICLES AND ACCELERATORS Abstract: We revisit the canonical quantization of free bosonic closed string theory and observe that the physicality of states requires vanishing of the worldsheet Virasoro algebra generators sandwiched between any two physical states. This requirement yields four classes of physical states, depending on discrete worldsheet symmetries: parity and time reversal. The usual string states which are highest weight states of the Virasoro algebra, preserve both, while the other new three classes break one or both. We initiate the quantization of a null p-brane in light-cone gauge using the idea of sandwich quantum constraints and sho ... 14:00 - 15:00 Combinatorics and Computing Weekly Seminar Approximating Prize-collecting Variants of the Traveling Salesman Problem School MATHEMATICS Many combinatorial optimization problems have been studied in the prize collecting setting, where the coverage requirement for an entity can be relaxed by paying a predefined penalty. This resembles the classical Lagrangian relaxation, and is natural in many practical applications. In this talk we discuss approximation algorithms for the prize-collecting version of the Traveling Salesman Problem (TSP) and some of its generalizations. Zoom room information: https://us06web.zoom.us/j/84906984159?pwd=BCWaIbXBuku3A5I84zNg9mHFxVZjXD.1 Meeting ID: 849 0698 4159 Passcode: 362880 Venue: Niavaran, Le ... 14:00 - 15:00 Weekly Seminar Differentiation Therapy: A Novel Approach in Cancer Therapy School BIOLOGICAL SCIENCES Cancer cells exhibit a high degree of plasticity, a characteristic that enables them to adapt and thrive in diverse environments. This plasticity is closely linked to stemness, with cancer cells possessing stem-like properties often displaying enhanced invasion, proliferation, and resistance to conventional therapies. Differentiation therapy offers a promising strategy to target this unique feature by inducing cancer cells to mature into less malignant, more functional states. By reducing their stemness, tumorigenic potential, and likelihood of resistance, differentiation therapy creates a more favorable context for integration with conventio ... 15:30 - 17:00 Geometry and Topology Weekly Seminar The Pants Graph and the Teichmuller Space School MATHEMATICS The pants graph of a compact orientable surface S, introduced by Hatcher and Thurston, is a simplicial graph whose vertices are maximal essential multicurves on S and whose edges correspond to certain local moves on multicurves. The importance of the pants graph comes from a theorem of Brock showing that the pants graph is a good combinatorial model for the Teichmuller space with the Wiel-Petersson metric, which is the space of hyperbolic metrics on S up to isotopy. In joint work with Marc Lackenby, we give upper bounds for distance in the pants graph and derive applications for distance in the Teichmuller space and also for volumes of hyper ... 17:30 - 19:00 Algebraic Geometry Biweekly Webinar Tyurin degenerations, Relative Lagrangian foliations and categorification of DT invariants School MATHEMATICS We discuss construction of a derived Lagrangian intersection theory of moduli spaces of perfect complexes, with support on divisors on compact Calabi Yau threefolds. Our goal is to compute deformation invariants associated to a fixed linear system of divisors in CY3. We apply a Tyurin degeneration of the CY3 into a normal-crossing singular variety composed of Fano threefolds meeting along their anti-canonical divisor. We show that the moduli space over the Fano 4 fold given by total space of degeneration family satisfies a relative Lagrangian foliation structure which leads to realizing the moduli space as derived critical locus of a global ( ... |