• April 06, 2022 01:30 PM
Speaker:
Title: On the wave turbulence theory for a stochastic KdV type equation
Venue: CMSA Room G10

Random Matrix & Probability Theory Seminar Speaker: Minh-Binh TRAN (SMU & MIT) Location: CMSA, Room G02** Title: On the wave turbulence theory for a stochastic KdV type equation Abstract: We report recent progress, in collaboration with Gigliola Staffilani (MIT), on the problem of deriving kinetic equations from dispersive equations. To be more precise, starting from the stochastic  Zakharov-Kuznetsov equation, a multidimensional KdV type equation on a hypercubic lattice, we provide a derivation of the 3-wave kinetic equation. We show that the two point correlation function can be asymptotically expressed as the solution of the 3-wave  kinetic equation at the kinetic limit under very general assumptions: the initial condition is out of equilibrium, the dimension is  $d\ge 2$, the smallness of…

  • April 06, 2022 01:00 PM
Speaker: Minh-Binh TRAN
Title: On the wave turbulence theory for a stochastic KdV type equation
Venue: Virtual

Abstract: We report recent progress, in collaboration with Gigliola Staffilani (MIT), on the problem of deriving kinetic equations from dispersive equations. To be more precise, starting from the stochastic  Zakharov-Kuznetsov equation, a multidimensional KdV type equation on a hypercubic lattice, we provide a derivation of the 3-wave kinetic equation. We show that the two point correlation function can be asymptotically expressed as the solution of the 3-wave  kinetic equation at the kinetic limit under very general assumptions: the initial condition is out of equilibrium, the dimension is  $d\ge 2$, the smallness of the nonlinearity $\lambda$ is allowed to be independent of the size of the lattice, the weak noise is chosen not to compete with the weak nonlinearity and…

  • November 18, 2021 05:52 PM
Speaker: Alberto Bracci
Title: Macroscopic properties of buyer-seller networks in online marketplaces
Venue: Virtual

Abstract:  Online marketplaces are the main engines of legal and illegal e-commerce, yet the aggregate properties of buyer-seller networks behind them are poorly understood. We analyse two datasets containing 245M transactions (16B USD)  between 2010 and 2021 involving online marketplaces: 28 dark web marketplaces (DWM), unregulated markets whose main currency is Bitcoin, and 144 product markets of one regulated e-commerce platform. We show how transactions in online marketplaces exhibit strikingly similar patterns of aggregate behavior despite significant differences in language, products, time, regulation, oversight, and technology. We find remarkable regularities in the distributions of (i) transaction amounts, (ii) number of transactions, (iii) inter-event times, (iv) time between first and last transactions. We then show how buyer behavior is…

  • January 25, 2021 08:00 AM
Speaker:
Title: Gromov-WittenDonaldson Thomas theory and BirationalSymplectic invariants for algebraic surfaces
Venue: Virtual

During the Spring 2021 Semester Artan Sheshmani (CMSA/ I.M. A.U.) will be teaching a CMSA special lecture series on Gromov-Witten/Donaldson Thomas theory and Birational/Symplectic invariants for algebraic surfaces. In order to attend this series, please fill out this form. The lectures will be held Mondays from 8:00 – 9:30 AM ET and Wednesdays from 8:00 – 9:00 AM ET beginning January 25 on Zoom. You can watch Prof. Sheshmani describe the series here. 

  • February 05, 2019 03:00 PM
Speaker:
Title: Special Lecture Series on Derived AlgebraicDifferential Geometry
Venue: Virtual

In the Spring 2019 Semester, the CMSA will be hosting a special lecture series on Derived algebraic/differential geometry run by Artan Sheshmani, with lectures given by Prof. Sheshmani and Dr. Dennis Borisov. The seminar will be held on Tuesdays and Thursdays from 3:00-4:30pm in CMSA, room G10. Click here for reference material Click here for a syllabus Schedule: Section 1: Basic setting of derived geometry The goal: To collect the minimum set of tools needed to do algebraic geometry in the derived context. 2/05/2019 Lecture 1: Model and с-categories Video 2/07/2019 Lecture 2: Grothendieck topologies and homotopy descent Video 2/12/2019 Lecture 3: Derived Artin stacks Video  2/14/2019 Lecture 4: Cotangent complexes Section 2: Loop spaces and differential forms…

  • October 26, 2018 01:30 PM
Speaker:
Title: Special Seminar
Venue: Virtual
  • October 16, 2018 05:42 PM
Speaker:
Title: Special Seminar
Venue: Virtual
  • October 15, 2018 06:10 PM
Speaker:
Title: Special Seminar
Venue: Virtual
  • October 05, 2018 06:06 PM
Speaker:
Title: Special Seminar
Venue: Virtual
  • April 30, 2018 01:30 PM
Speaker:
Title: Special Seminar
Venue: Virtual
  • March 30, 2018 09:30 AM
Speaker:
Title: Special Seminar
Venue: Virtual
  • March 28, 2018 03:00 PM
Speaker:
Title: -- Special Seminar
Venue: Virtual
  • February 16, 2018 09:30 AM
Speaker:
Title: -- Special Seminar
Venue: Virtual
  • January 30, 2018 02:43 PM
Speaker:
Title: -- Special Seminar
Venue: Virtual
  • May 23, 2017 01:32 PM
Speaker:
Title: CMSA Special Seminar
Venue: Virtual
  • April 27, 2017 01:21 PM
Speaker:
Title: -- CMSA Special Seminar
Venue: Virtual
  • April 06, 2017 12:51 PM
Speaker:
Title: -- CMSA Special Seminar
Venue: Virtual
  • March 08, 2017 12:25 PM
Speaker:
Title: -- CMSA Special Seminar
Venue: Virtual
  • February 09, 2017 11:35 AM
Speaker:
Title: -- CMSA Special Seminar
Venue: Virtual
  • January 12, 2017 11:25 AM
Speaker:
Title: -- CMSA Special Seminar
Venue: Virtual