MARK KAC SEMINAR

April 2024 Season 2023-2024 Main speaker: N. Kistler

April 5 2024

Location: TBA, room TBA
11:15–13:00
Nicola Kistler (Frankfurt) homepage

TBA

TBA

14:15–16:00
Vittoria Silvestri (Rome) homepage

TBA

We study the metastable behavior of the stochastic Blume–Capel model evolving according to the Glauber dynamics with zero boundary conditions. We will show that, due to the three–state character of the Blume–Capel model, the metastability scenario proven for periodic boundary condition changes deeply when different boundary conditions are considered.

The Hamiltonian of the Blume–Capel model depends on the magnetic field $h$ and the chemical potential $\lambda$. We study the heuristic in the whole region $\lambda,h > 0$, where the chemical potential term equally favors minus and plus spins with respect to zeroes and the magnetic field favors plusesand disadvantages minuses with respect to the zeroes, and we compere our results with the Blume-Capel model with periodic boundary conditions. Then, we analyze in detail the region $\lambda>h>0$. In this region, we identify the unique metastable state $\underline{-1}$, we compute the energy barrier from $\underline{-1}$ to the stable state $\underline{+1}$, and we find an estimate for the asymptotic behavior of the transition time from the metastable to the stable state as $\beta\to\infty$, where $\beta$ is the inverse of the temperature.