Abstract
AbstractThe paper deals with the comparison in dimension two between the strong Jacobian determinant $$\textrm{det}\hspace{0.56905pt}$$
det
and the weak (or distributional) Jacobian determinant $$\textrm{Det}\hspace{0.56905pt}$$
Det
. Restricting ourselves to dimension two, we extend the classical results of Ball and Müller as well as more recent ones to bounded variation vector-valued functions, providing a sufficient condition on a vector-valued U in $$BV(\Omega )^2$$
B
V
(
Ω
)
2
such that the equality $$\textrm{det}\hspace{0.56905pt}(\nabla U)=\textrm{Det}\hspace{0.56905pt}(\nabla U)$$
det
(
∇
U
)
=
Det
(
∇
U
)
holds either in the distributional sense on $$\Omega $$
Ω
, or almost-everywhere in $$\Omega $$
Ω
when U is in $$W^{1,1}(\Omega )^2$$
W
1
,
1
(
Ω
)
2
. The key-assumption of the result is the regularity of the Jacobian matrix-valued $$\nabla U$$
∇
U
along the direction of a given non vanishing vector field $$b\in C^1(\Omega )^2$$
b
∈
C
1
(
Ω
)
2
, i.e.$$\nabla U\, b$$
∇
U
b
is assumed either to belong to $$C^0(\Omega )^2$$
C
0
(
Ω
)
2
with one of its coordinates in $$C^1(\Omega )$$
C
1
(
Ω
)
, or to belong to $$C^1(\Omega )^2$$
C
1
(
Ω
)
2
. Two examples illustrate this new notion of two-dimensional distributional determinant. Finally, we prove the lower semicontinuity of a polyconvex energy defined for vector-valued functions U in $$BV(\Omega )^2$$
B
V
(
Ω
)
2
, assuming that the vector field b and one of the coordinates of $$\nabla U\, b$$
∇
U
b
lie in a compact set of regular vector-valued functions.
Funder
Ministerio de Ciencia e Innovación
Universidad de Sevilla
Publisher
Springer Science and Business Media LLC
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