Monday, August 1 |
07:00 - 08:45 |
Breakfast ↓ Breakfast is served daily between 7 and 9am in the Vistas Dining Room, the top floor of the Sally Borden Building. (Vistas Dining Room) |
08:45 - 09:00 |
Introduction and Welcome by BIRS Staff ↓ A brief introduction to BIRS with important logistical information, technology instruction, and opportunity for participants to ask questions. (TCPL 201) |
09:00 - 09:25 |
Yuan Lou: Asymptotic analysis of prinical eigenvalues for time-periodic operators (Online) |
09:30 - 09:55 |
Léo Girardin: Spectral optimization of the periodic principal eigenvalue of a space-time periodic, cooperative parabolic operator ↓ In this talk I will report on a spectral optimization result obtained
in collaboration with Idriss Mazari (Univ. Paris-Dauphine). More
precisely, our goal is to optimize the principal eigenvalue of a
space-time periodic cooperative operator acting on vector-valued
functions. In this problem, the principal eigenvalue is understood as
a function of the off-diagonal elements of the coupling matrix. It
turns out that this is not a convex optimization problem and that the
construction of optimizers, both minimizers and maximizers, requires
a new method. We devise such a method by taking inspiration in a
matrix-theory paper of 2007 by Neumann and Sze. (Online) |
10:00 - 10:30 |
Coffee Break (TCPL Foyer) |
10:35 - 11:00 |
Juncheng Wei: On bounded Morse index solutions of the Allen-Cahn equation on surfaces: Geodesic nets and higher multiplicities (TCPL 201) |
11:05 - 11:30 |
Luca Rossi: Are solutions of reaction-diffusion equations asymptotically 1D ? ↓ The symmetry of solutions of elliptic equations is a classical and challenging problem in PDEs, strictly linked with stability. We consider in this talk reaction-diffusion equations and we ask whether the 1-dimensional symmetry eventually emerges in the long time, for solutions which are initially non-symmetric. We will present a satisfactory answer in the case of the Fisher-KPP equation, together with some counter-examples and open questions. This topic is the object of a joint work with F. Hamel. (TCPL 201) |
11:30 - 13:00 |
Lunch ↓ Lunch is served daily between 11:30am and 1:30pm in the Vistas Dining Room, the top floor of the Sally Borden Building. (Vistas Dining Room) |
14:00 - 14:20 |
Group Photo ↓ Meet in foyer of TCPL to participate in the BIRS group photo. The photograph will be taken outdoors, so dress appropriately for the weather. Please don't be late, or you might not be in the official group photo! (TCPL Foyer) |
14:30 - 14:55 |
Harunori Monobe: Singular limit problems of mathematical models related to invasive alien species (TCPL 201) |
15:00 - 15:30 |
Coffee Break (TCPL Foyer) |
15:35 - 16:00 |
Maolin Zhou: The link between linear selection and decay rate ↓ In this work, we consider the speed selection problem of the scalar reaction-diffusion equations and the Lotka-Volterra competition systems. Compared with the classical result on single equations by Muratov et. al., we propose a sufficient and necessary criterion to this long-standing problem of monostable dynamical systems for the first time. Moreover, our results can further reveal the essence of the linear determined problem from a new viewpoint on the decay rate of travelling wave solutions. (Online) |
16:05 - 16:30 |
Bendong Lou: Propagation of mean curvature flows in a cylinder with unbounded boundary slopes ↓ In this talk I will consider mean curvature flows in a cylinder with Robin
boundary conditions. The boundary slopes are unbounded when the flow goes to
infinity, and so there is no uniform-in-time gradient estimates. Nevertheless, by using the zero number argument we can present interior uniform-in-time gradient estimates. Then we show that, in 1D case, the flow converges as t→∞ to a Grim Reaper whose whole profile lies in the cylinder; in nD case, the flow propagates to infinity with exponential speed: u∼e(N−1)te|x|22. (Joint work with X. Wang and L. Yuan) . (Online) |
16:35 - 17:00 |
Francois Hamel: Spreading speeds and spreading sets for reaction-diffusion equations ↓ The talk is about the large time dynamics of bounded solutions of reaction-diffusion equations with unbounded initial support in RN. I will present a Freidlin-Gartner type variational formula for the spreading speeds in any direction. This provides a description of the asymptotic shape of the level sets of the solutions at large time. The formula involves notions of bounded and unbounded directions of the initial support. The results hold for a large class of reaction terms and for solutions emanating from initial conditions with general unbounded support. I will also discuss the sharpness of the results and I will list some counterxamples when the assumptions are not all fulfilled. The talk is based on some joint works with Luca Rossi. (Online) |
17:30 - 19:30 |
Dinner ↓ A buffet dinner is served daily between 5:30pm and 7:30pm in Vistas Dining Room, top floor of the Sally Borden Building. (Vistas Dining Room) |