Published Paper
Inserted: 7 jan 2004
Last Updated: 3 may 2011
Journal: Duke Math. J.
Volume: 127
Number: 2
Pages: 313-339
Year: 2004
Abstract:
We consider the Cauchy problem
for the system $\partial_t u_i + \div_z (g(
u
) u_i) = 0$ $i\in \{1,
\ldots, k\}$, in $m$ space
dimensions and with $g\in C^3$. When $k\geq 2$ and $m=2$ we show a wide
choice of $g$'s for which the BV norm of admissible solutions can blow up,
even when the initial data have arbitrarily small
oscillation, arbitrarily small total variation, and are bounded away
from the origin. When $m\geq 3$ we show that this occurs whenever $g$ is
not constant, i.e. unless the system reduces to $k$ decoupled transport
equations with constant coefficients.
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