| Sunday 1 June 2025 | |
| Events for day: Wednesday 28 May 2025 |
| 11:00 - 12:00 Wednesday Weekly Seminar - Hybrid Format Yukawa Ameliorated Klein-Gordon approach for resolving GR singularities School PARTICLES AND ACCELERATORS Abstract: Singularities in Newton's gravitation, in general relativity (GR), in Coulomb's law, and elsewhere in classical physics, stem from two ill-conceived assumptions: a) there are point-like entities with finite masses, charges, etc., packed in zero volumes, and b) the non-quantum assumption that these point-likes can be assigned precise coordinates and momenta. In the case of GR, we argue that the classical energy-momentum tensor in Einstein's field equation is that of a collection of point particles and is prone to singularity. In compliance with Heisenberg's uncertainty principle, we suggest replacing each constituent o ... 13:30 - 15:00 Journal Club Parameterizing neural power spectra into periodic and aperiodic components School COGNITIVE SCIENCES ... 14:00 - 15:00 Combinatorics and Computing Weekly Seminar Improved Asymptotic Expansion Lower Bounds for Random d-Regular Graphs (d ≥ 4) School MATHEMATICS In this talk we introduce the asymptotic almost sure expansion lower bounds of random d-regular graphs in the uniform model and provide improvements for d ≥ 4 through solving a parametrized relaxation of the expansion lower bound problem. As a concrete consequence of our main result, we prove that for large degrees d ≥ 6 � 10^4 the optimal a.a.s. expansion lower bound of d-regular graphs is greater than d/2 - 0.7942^{-} √d which is an improvement over the long-standing a.a.s. lower bound d/2 - 0.8326^{-} √d provided by B. Bollob�as (1988). Also, for small degrees, we apply our ... 14:00 - 15:00 QPM Weekly Seminar (Hybrid Format) Quantum Engineering with hBN Color Centers: Spin Control, Strain, and Decoherence Time School QUANTUM PHYSICS AND MATTER Solid-state spin defects in 3D materials have shown remarkable capabilities in quantum sensing and information processing. While these materials are effective, the search for scalable alternatives is ongoing. Two-dimensional materials like hexagonal boron nitride (hBN) are emerging as promising candidates. The negatively charged boron vacancy (VB) in hBN exhibits exceptional room-temperature properties, positioning it as a compelling platform for scalable quantum technologies. This lecture explores recent advances in harnessing VB centers for quantum technologies, focusing on three interconnected pillars: spin control, strain-mediated couplin ... 14:00 - 15:00 Weekly Seminar Cosmology In One Slide School BIOLOGICAL SCIENCES In this talk, I will try to sketch the big picture of our universe's history (of course as far as we know till now). This leads us to the darkness, dark matter and dark energy, the standard model of cosmology. Then I will review very briefly the recent tensions and anomalies in this model. If we had time, I would like to end with my own question: Why is our universe so simple? This Seminar is free, hybrid, and open to the public. ... 17:30 - 19:00 Algebraic Geometry Biweekly Webinar Hadamard Products of Symbolic Powers and Hadamard Fat Grids School MATHEMATICS In this talk we study some properties of the Hadamard products of symbolic powers, in particular, if for points $P, Qin {mathbb{P}}^2$, we get $I(P)^m*I(Q)^n= I(P*Q)^{m+n−1}$. We obtain different results according to the number of zero coordinates in $P$ and $Q$. Successively, we define the so called Hadamard fat grids, which are the result of the Hadamard product of two sets of collinear points with given multiplicites. The most important invariants of Hadamard fat grids, as minimal resolution, Waldschmidt constant and resurgence, are then computed using also tools and known results in ${mathbb{P}}^1 imes{mathbb{P}}^1$. (This is a joi ... |