IPM Calendar 
Saturday 3 June 2023   Today  
Events for day: Wednesday 15 June 2022    
           14:00 - 15:00     Combinatorics and Computing Weekly Seminar
Expander Graphs: Intrinsic Structures


Expander graphs have been extensively studied in recent decades due to their important applications in different areas of mathematics and computer sciences. Due to high connectivity of expanders, explicit construction of these graphs has been of great theoretical and applied importance in the literature. In this talk, we focus on finding special simple structures such as trees and cycles in expander graphs and we show how these observations can be exploited in Ramsey Theory.

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           14:00 - 15:00     Wednesday Weekly Seminar - google meet
First direct measurement of the Higgs-tau Yukawa coupling


I will present the first direct measurement of the CP structure of the Higgs-tau Yukawa coupling (DOI: 10.1007/JHEP06(2022)012). The measurement was performed using proton-proton collision data recorded by the CMS experiment at CERN which corresponds to an integrated luminosity of 137 $fb^{-1}$ and $sqrt(s)=13$ TeV center of mass-energy. The analysis uses the angular correlation between the decay planes of tau leptons produced in Higgs boson decays. Several techniques were employed to optimize the CP sensitivity. The effective mixing angle between CP-even and CP-odd ? Yukawa couplings is found to be ?1 +- 19, compared to an expected value of ...

           14:00 - 15:00     Weekly Seminar
Two-component density functional theory for muonic molecules


It is well-known experimentally that the positively charged muon and the muonium atom may bind to molecules and solids, and through muon's magnetic interaction with unpaired electrons, valuable information on the local environment surrounding the muon is deduced. Theoretical understanding of the structures and properties of the resulting muonic species requires accurate and efficient quantum mechanical computational methodologies. In this talk, the two-component density functional theory (TC-DFT) will be introduced as a possible candidate for the proper treatment of muonic systems. This approach is capable of treating the electrons and positi ...

           16:00 - 17:30     Geometry and Topology Seminar - online
Some Generic Statistical Properties of Dynamical Systems


In this talk we aim to introduce a basic observation about relation between statistical properties of a map and its perturbations, which holds Baire generically in any family of dynamics. Roughly speaking, the relation is that any statistical behavior that is exhibited by small perturbations of a map, is exhibited by the map itself.
This observation can be applied in two different category of maps. The first category is formed by those families of maps that the existence of time averages for is guaranteed for almost every point, such as conservative systems or mostly contracting partially hyperbolic diffeomorphisms. Here we present ...

           17:00 - 19:15     Applications of Blockchain Technology in Engineering Systems

https://b2n.ir/p55285 ...

           17:30 - 18:30     Mathematical Logic Weekly Seminar
O-minimal Version of the Elekes-Szabo Theorem


Erdos and Szemeredi observed the following sum-product phenomenon: there is some c>0 such that for any finite set A of reals, max{|A+A|, |A*A|} > |A|^{1+c}. Later, Elekes and Ronyai generalized this by showing that for any polynomial f(x,y) we must have |f(A*A)|>|A|^{1+c}, unless f is either additive or multiplicative (i.e. of the form g(h(x) + i(y)) or g(h(x) * i(y)) for some univariate polynomials g,h,i respectively). A remarkable theorem of Elekes and Szabo provides a conceptual generalization, showing that for any polynomial F(x,y,z) such that its set of zeroes has dimension 2, if F has a maximal possible number of zeroes n^2 on finite n ...