The Cauchy problem for the modified Novikov equation
© Hou and Zheng; licensee Springer. 2014
Received: 18 March 2014
Accepted: 26 June 2014
Published: 24 September 2014
In this paper, we are concerned with the Cauchy problem for the modified Novikov equation. By using the transport equation theory and Littlewood-Paley decomposition as well as nonhomogeneous Besov spaces, we prove that the Cauchy problem for the modified Novikov equation is locally well posed in the Besov space with and and show that the Cauchy problem for the modified Novikov equation is locally well posed in the Besov space with the aid of Osgood lemma.
MSC: 35G25, 35L05, 35R25.
was discovered by Vladimir Novikov  and it possesses the bi-Hamiltonian structure, infinite conservation laws. The well-posedness and blow-up of the Cauchy problem for the Novikov equation in Sobolev spaces and Besov spaces have been investigated by some authors –. The weak solution of the Cauchy problem for the Novikov equation has been investigated by some authors , , . Recently, Li and Yan  considered the Cauchy problem for the KdV equation with higher dispersion.
To the best of our knowledge, the well-posedness and blow-up of the Cauchy problem for (1.3) and (1.4) in Besov spaces are open up to now. More precisely, in this paper, motivated by , , using Littlewood-Paley decomposition and nonhomogeneous Besov spaces, we prove that the Cauchy problem for (1.4) is locally well posed in the Besov space with and we give a blow-up criterion.
The main results of this paper are as follows.
Letandand. Then there exists a timesuch that problem (1.3) and (1.4) has a unique solutionin. The mapis continuous from a neighborhood ofinintofor every. When, the solution to problem (1.3) and (1.4) is continuous in.
When, (1.3) and (1.4) is locally well posed in the sense of Hadamard.
The remainder of this paper is organized as follows. In Section 2, we give some preliminaries. In Section 3, we establish local well-posedness of the Cauchy problem for the generalized Camassa-Holm equation in Besov spaces. In Section 4, we prove Theorem 1.2.
There exists a couple of smooth radial functionsvalued insuch thatis supported in the ballandis supported in the ring. Moreover,
with the aid of Young’s inequality, where is a positive constant independent of .
In particular, . Let , and . Define .
Topological properties: is a Banach space which is continuously embedded in .
Density: is dense in .
- (3)Embedding: if and .
Algebraic properties: , is a Banach algebra. is a Banach algebra ⇔ ⇔ or ( and ). In particular, is continuously embedded in and is a Banach algebra.
1-D Moser-type estimates:
- (i)For ,
- (ii)( if ) and , we have
- (6)Complex interpolation:
- (7)Real interpolation: , , , there exists a constant such that
Let and be an -multiplier (i.e., is smooth and satisfies that , ∋ a constant , s.t. for all ). Then the operator is continuous from to . Notice that is continuous from to and is continuous from to .
The usual product is continuous from to .
- (11)There exists a constant such that the following interpolation inequality holds:
(A priori estimates in Besov spaces)
- (1)If or , then
- (2)If , and and , then
If , then for all , (1) holds true when .
If , then . If , then for all .
(Existence and uniqueness)
Let, , , andbe as in the statement of Lemma 2.3. Assume thatfor someandandiforandandif. Then problem (2.2) and (2.3) has a unique solutionand the inequalities of Lemma 2.3can hold true. Moreover, if, then.
3 Proof of Theorem 1.1
By using the following six steps, we will complete the proof of Theorem 1.1.
It is easily checked that , by using Lemma 2.4 and the inductive method, for all , we have that (3.1) and (3.2) has a global solution which belongs to .
for all .
Combining (3.6)-(3.7) with (3.4), we have (3.3).
which yields .
Third step: Convergence. We will derive that is a Cauchy sequence in .
From (3.31), we have that . Thus, . Consequently, is a Cauchy sequence in ; moreover, is convergent to some limit function .
Consequently, is a Cauchy sequence in and converges to some limit function .
Fourth step: Existence of solution in. Existence of solution can be proved similarly to .
Fifth step: Uniqueness of solution. We consider case and case , respectively. In fact, this can be proved similarly to .
Sixth step: Continuity with respect to the initial data. Continuity with respect to the initial data can be proved similarly to .
4 Proof of Theorem 1.2
Thus, is uniformly bounded in . From (3.1), by using (4) in Lemma 2.2, we can prove that is uniformly bounded with respect to in .
and with the aid of (2.1), we can prove that is a Cauchy sequence in .
We would like to thank the reviewers for careful reading and valuable comments on the original draft.
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