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Smoothness of the flow map for low-regularity solutions of the Camassa-Holm equations
July  2013, 33(7): 2809-2827. doi: 10.3934/dcds.2013.33.2809

## Lipschitz metric for the Camassa--Holm equation on the line

 1 Department of Mathematical Sciences, Norwegian University of Science and Technology, NO-7491 Trondheim 2 Centre of Mathematics for Applications, University of Oslo, NO-0316 Oslo

Received  March 2012 Revised  May 2012 Published  January 2013

We study stability of solutions of the Cauchy problem on the line for the Camassa--Holm equation $u_t-u_{xxt}+3uu_x-2u_xu_{xx}-uu_{xxx}=0$ with initial data $u_0$. In particular, we derive a new Lipschitz metric $d_D$ with the property that for two solutions $u$ and $v$ of the equation we have $d_D(u(t),v(t))\le e^{Ct} d_D(u_0,v_0)$. The relationship between this metric and the usual norms in $H^1$ and $L^\infty$ is clarified. The method extends to the generalized hyperelastic-rod equation $u_t-u_{xxt}+f(u)_x-f(u)_{xxx}+(g(u)+\frac12 f''(u)(u_x)^2)_x=0$ (for $f$ without inflection points).
Citation: Katrin Grunert, Helge Holden, Xavier Raynaud. Lipschitz metric for the Camassa--Holm equation on the line. Discrete & Continuous Dynamical Systems - A, 2013, 33 (7) : 2809-2827. doi: 10.3934/dcds.2013.33.2809
##### References:
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##### References:
 [1] A. Bressan and A. Constantin, Global conservative solutions of the Camassa-Holm equation,, Arch. Ration. Mech. Anal., 183 (2007), 215. doi: 10.1007/s00205-006-0010-z. Google Scholar [2] A. Bressan, H. Holden and X. Raynaud, Lipschitz metric for the Hunter-Saxton equation,, J. Math. Pures Appl., 94 (2010), 68. doi: 10.1016/j.matpur.2010.02.005. Google Scholar [3] R. Camassa and D. D. Holm, An integrable shallow water equation with peaked solutions,, Phys. Rev. Lett., 71 (1993), 1661. doi: 10.1103/PhysRevLett.71.1661. Google Scholar [4] R. Camassa, D. D. Holm and J. Hyman, A new integrable shallow water equation,, Adv. Appl. Mech., 31 (1994), 1. Google Scholar [5] A. Constantin and J. Escher, Global existence and blow-up for a shallow water equation,, Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4), 26 (1998), 303. Google Scholar [6] A. Constantin and J. Escher, Wave breaking for nonlinear nonlocal shallow water equations,, Acta Math., 181 (1998), 229. doi: 10.1007/BF02392586. Google Scholar [7] A. Constantin and J. Escher, On the blow-up rate and the blow-up set of breaking waves for a shallow water equation,, Math. Z., 233 (2000), 75. doi: 10.1007/PL00004793. Google Scholar [8] A. Constantin and D. Lannes, The hydrodynamical relevance of the Camassa-Holm and Degasperis-Procesi equations,, Arch. Rat. Mech. Anal., 192 (2009), 165. doi: 10.1007/s00205-008-0128-2. Google Scholar [9] H.-H. Dai, Exact traveling-wave solutions of an integrable equation arising in hyperelastic rods,, Wave Motion, 28 (1998), 367. doi: 10.1016/S0165-2125(98)00014-6. Google Scholar [10] H.-H. Dai, Model equations for nonlinear dispersive waves in a compressible Mooney-Rivlin rod,, Acta Mech., 127 (1998), 193. doi: 10.1007/BF01170373. Google Scholar [11] H.-H. Dai and Y. Huo, Solitary shock waves and other travelling waves in a general compressible hyperelastic rod,, Proc. R. Soc. Lond. Ser. A Math. Phys. Eng. Sci., 456 (2000), 331. doi: 10.1098/rspa.2000.0520. Google Scholar [12] K. Grunert, H. Holden and X. Raynaud, Lipschitz metric for the periodic Camassa-Holm equation,, J. Differential Equations, 250 (2011), 1460. doi: 10.1016/j.jde.2010.07.006. Google Scholar [13] H. Holden and X. Raynaud, Global conservative solutions of the Camassa-Holm equation-a Lagrangian point of view,, Comm. Partial Differential Equations, 32 (2007), 1511. doi: 10.1080/03605300601088674. Google Scholar [14] H. Holden and X. Raynaud, Global conservative multipeakon solutions of the Camassa-Holm equation,, J. Hyperbolic Differ. Equ., 4 (2007), 39. doi: 10.1142/S0219891607001045. Google Scholar [15] H. Holden and X. Raynaud, Global conservative solutions of the generalized hyperelastic-rod wave equation,, J. Differential Equations, 233 (2007), 448. doi: 10.1016/j.jde.2006.09.007. Google Scholar
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