In this paper we consider the totally asymmetric simple exclusion process, with non-random initial condition having three regions of constant densities of particles. From left to right, the densities of the three regions are increasing. Consequently,
there are three characteristics which meet, i.e. two shocks merge. We study the particle fluctuations at this merging point and show that they are given by a product of three (properly scaled) GOE Tracy-Widom distribution functions. We work directly in TASEP without relying on the connection to last passage percolation.
We study edge asymptotics of poissonized Plancherel-type measures on skew Young diagrams (integer partitions). These measures can be seen as generalizations of those studied by Baik--Deift--Johansson and Baik--Rains in resolving Ulams problem on long
est increasing subsequences of random permutations and the last passage percolation (corner growth) discre
We consider the totally asymmetric simple exclusion process (TASEP) with non-random initial condition having density $rho$ on $mathbb{Z}_-$ and $lambda$ on $mathbb{Z}_+$, and a second class particle initially at the origin. For $rho<lambda$, there is
a shock and the second class particle moves with speed $1-lambda-rho$. For large time $t$, we show that the position of the second class particle fluctuates on a $t^{1/3}$ scale and determine its limiting law. We also obtain the limiting distribution of the number of steps made by the second class particle until time $t$.
