Some Exact Blowup Solutions to the Pressureless Euler Equations in R^N

The pressureless Euler equations can be used as simple models of cosmology or plasma physics. In this paper, we construct the exact solutions in non-radial symmetry to the pressureless Euler equations in $R^N:$% [c]{c}% \rho(t,\vec{x})=\frac{f(\frac{1}{a(t)^{s}}\underset{i=1}{\overset {N}{\sum}}x_{i}^{s})}{a(t)^{N}}$\text{,}$\vec{u}(t,\vec{x}% )=\frac{\overset{\cdot}{a}(t)}{a(t)}\vec{x}, a(t)=a_{1}+a_{2}t. \label{eq234}% where the arbitrary function $f\ge 0$ and $f\in C^1;$ $s\ge 1$, $a_1>0$ and $a_2$ are constants$\mathrm{.}$\newline In particular, for $a_2<0$, the solutions blow up on the finite time $T=-a_1\mathrm{/}{a}_2$. Moreover, the functions (\ref{eq234}) are also the solutions to the pressureless Navier-Stokes equations.