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Optimal time decay estimation for large-solution about 3D compressible MHD equations
Authors
Fei Chen
Chuanbao Wang
Shuai Wang
Publication date
10 June 2022
Publisher
View
on
arXiv
Abstract
This paper mainly focus on optimal time decay estimation for large-solution about compressible magnetohydrodynamic equations in 3D whole space, provided that
(
Ο
0
β
1
,
u
0
,
M
0
)
β
L
1
β©
H
2
(\sigma_{0}-1,u_{0},M_{0})\in L^1\cap H^2
(
Ο
0
β
β
1
,
u
0
β
,
M
0
β
)
β
L
1
β©
H
2
. In [2](Chen et al.,2019), they proved time decay estimation of
β₯
(
Ο
β
1
,
u
,
M
)
β₯
H
1
\|(\sigma-1,u,M)\|_{H^1}
β₯
(
Ο
β
1
,
u
,
M
)
β₯
H
1
β
being
(
1
+
t
)
β
3
4
(1+t)^{-\frac{3}{4}}
(
1
+
t
)
β
4
3
β
. Based on it, we obtained that of
β₯
β
(
Ο
β
1
,
u
,
M
)
β₯
H
1
\|\nabla(\sigma-1,u,M)\|_{H^1}
β₯β
(
Ο
β
1
,
u
,
M
)
β₯
H
1
β
being
(
1
+
t
)
β
5
4
(1+t)^{-\frac{5}{4}}
(
1
+
t
)
β
4
5
β
in [24]. Therefore, we are committed to improving that of
β₯
β
2
(
Ο
β
1
,
u
,
M
)
β₯
L
2
\|\nabla^2 (\sigma-1,u,M)\|_{L^2}
β₯
β
2
(
Ο
β
1
,
u
,
M
)
β₯
L
2
β
in this paper. Thanks to the method adopted in [25] (Wang and Wen, 2021), we get the optimal time decay estimation to the highest-order derivative for space of solution, which means that time decay estimation of
β₯
β
2
(
Ο
β
1
,
u
,
M
)
β₯
L
2
\|\nabla^2 (\sigma-1,u,M)\|_{L^2}
β₯
β
2
(
Ο
β
1
,
u
,
M
)
β₯
L
2
β
is
(
1
+
t
)
β
7
4
(1+t)^{-\frac{7}{4}}
(
1
+
t
)
β
4
7
β
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oai:arXiv.org:2206.05117
Last time updated on 20/08/2022