Low rankness in forward and inverse kinetic theory

Low rankness in forward and inverse kinetic theory

###### Applied Math And Analysis Seminar

#### Qin Li (University of Wisconsin-Madison)

**Wednesday, January 16, 2019 -**

12:00pm to 1:00pm

Location:

119 Physics

Multi-scale kinetic equations can be compressed: in certain regimes, the Boltzmann equation is asymptotically equivalent to the Euler equations, and the radiative transfer equation is asymptotically equivalent to the diffusion equation. A lot of detailed information is lost when the system passes to the limit. In linear algebra, it is equivalent to being of low rank. I will discuss such transition and how it affects the computation: mainly, in the forward regime, inserting low-rankness could greatly advances the computation, while in the inverse regime, the system being of low rank typically makes the problems significantly harder.

Last updated: 2019/07/21 - 2:15pm