# American Institute of Mathematical Sciences

January  2013, 33(1): 305-320. doi: 10.3934/dcds.2013.33.305

## Existence, regularity and boundary behaviour of bounded variation solutions of a one-dimensional capillarity equation

 1 Dipartimento di Matematica e Geoscienze, Università degli Studi di Trieste, Via A. Valerio 12/1, 34127 Trieste, Italy, Italy

Received  August 2011 Published  September 2012

We discuss existence and regularity of bounded variation solutions of the Dirichlet problem for the one-dimensional capillarity-type equation \begin{equation*} \Big( u'/{ \sqrt{1+{u'}^2}}\Big)' = f(t,u) \quad \hbox{ in } {]-r,r[}, \qquad u(-r)=a, \, u(r) = b. \end{equation*} We prove interior regularity of solutions and we obtain a precise description of their boundary behaviour. This is achieved by a direct and elementary approach that exploits the properties of the zero set of the right-hand side $f$ of the equation.
Citation: Franco Obersnel, Pierpaolo Omari. Existence, regularity and boundary behaviour of bounded variation solutions of a one-dimensional capillarity equation. Discrete & Continuous Dynamical Systems - A, 2013, 33 (1) : 305-320. doi: 10.3934/dcds.2013.33.305
##### References:
 [1] G. Anzellotti, The Euler equation for functionals with linear growth,, Trans. Amer. Math. Soc., 290 (1985), 483. doi: 10.1090/S0002-9947-1985-0792808-4. Google Scholar [2] D. Bonheure, F. Obersnel and P. Omari, Heteroclinic solutions of the prescribed curvature equation with a double-well potential,, preprint, (2011). Google Scholar [3] D. Bonheure, P. Habets, F. Obersnel and P. Omari, Classical and non-classical solutions of a prescribed curvature equation,, J. Differential Equations, 243 (2007), 208. doi: 10.1016/j.jde.2007.05.031. Google Scholar [4] D. Bonheure, P. Habets, F. Obersnel and P. Omari, Classical and non-classical positive solutions of a prescribed curvature equation with singularities,, Rend. Istit. Mat. Univ. Trieste, 39 (2007), 63. Google Scholar [5] G. Buttazzo, M. Giaquinta and S. Hildebrandt, "One-dimensional Variational Problems. An Introduction,'', Clarendon Press, (1998). Google Scholar [6] K. C. Chang, The spectrum of the 1-Laplace operator,, Commun. Contemp. Math., 11 (2009), 865. doi: 10.1142/S0219199709003570. Google Scholar [7] M. Emmer, Esistenza, unicità e regolarità nelle superfici di equilibrio nei capillari,, Ann. Univ. Ferrara Sez. VII (N.S.), 18 (1973), 79. Google Scholar [8] C. Gerhardt, Existence and regularity of capillary surfaces,, Boll. Un. Mat. Ital. (4), 10 (1974), 317. Google Scholar [9] C. Gerhardt, Existence, regularity, and boundary behavior of generalized surfaces of prescribed mean curvature,, Math. Z., 139 (1974), 173. doi: 10.1007/BF01418314. Google Scholar [10] M. Giaquinta, Regolarità delle superfici $BV$ con curvatura media assegnata,, Boll. Un. Mat. Ital. (4), 8 (1973), 567. Google Scholar [11] E. Giusti, "Minimal Surfaces and Functions of Bounded Variations,", Birkhäuser, (1984). Google Scholar [12] P. Habets and P. Omari, Multiple positive solutions of a one-dimensional prescribed mean curvature problem,, Commun. Contemp. Math., 9 (2007), 701. doi: 10.1142/S0219199707002617. Google Scholar [13] A. Hammerstein, Nichtlineare Integralgleichungen nebst Anwendungen,, Acta Math., 54 (1930), 117. doi: 10.1007/BF02547519. Google Scholar [14] V. K. Le, Some existence results on non-trivial solutions of the prescribed mean curvature equation,, Adv. Nonlinear Stud., 5 (2005), 133. Google Scholar [15] V. K. Le, Variational method based on finite dimensional approximation in a generalized prescribed mean curvature problem,, J. Differential Equations, 246 (2009), 3559. doi: 10.1016/j.jde.2008.11.015. Google Scholar [16] U. Massari, Esistenza e regolarità delle ipersuperficie di curvatura media assegnata in $\RR^n$,, Arch. Rational Mech. Anal., 55 (1974), 357. doi: 10.1007/BF00250439. Google Scholar [17] J. Mawhin, J. R. Ward Jr. and M. Willem, Variational methods and semilinear elliptic equations,, Arch. Rational Mech. Anal., 95 (1986), 269. doi: 10.1007/BF00251362. Google Scholar [18] A. Mellet and J. Vovelle, Existence and regularity of extremal solutions for a mean-curvature equation,, J. Differential Equations, 249 (2010), 37. doi: 10.1016/j.jde.2010.03.026. Google Scholar [19] M. Miranda, Dirichlet problem with L 1 data for the non-homogeneous minimal surface equation,, Indiana Univ. Math. J., 24 (): 227. doi: 10.1512/iumj.1974.24.24020. Google Scholar [20] F. Obersnel, Classical and non-classical sign changing solutions of a one-dimensional autonomous prescribed curvature equation,, Adv. Nonlinear Stud., 7 (2007), 1. Google Scholar [21] F. Obersnel and P. Omari, Existence and multiplicity results for the prescribed mean curvature equation via lower and upper solutions,, Differential Integral Equations, 22 (2009), 853. Google Scholar [22] F. Obersnel and P. Omari, Positive solutions of the Dirichlet problem for the prescribed mean curvature equation,, J. Differential Equations, 249 (2010), 1674. doi: 10.1016/j.jde.2010.07.001. Google Scholar [23] F. Obersnel, P. Omari and S. Rivetti, Existence, regularity and stability properties of periodic solutions of a capillarity equation in the presence of lower and upper solutions,, Nonlinear Anal. Real World Appl., 13 (2012), 2830. doi: 10.1016/j.nonrwa.2012.04.012. Google Scholar [24] L. Schwartz, Les théorèmes de Whitney sur les fonctions différentiables,, Séminaire Bourbaki, 1 (1995), 355. Google Scholar [25] J. Serrin, The problem of Dirichlet for quasilinear elliptic differential equations with many independent variables,, Philos. Trans. Roy. Soc. London Ser. A, 264 (1969), 413. doi: 10.1098/rsta.1969.0033. Google Scholar

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##### References:
 [1] G. Anzellotti, The Euler equation for functionals with linear growth,, Trans. Amer. Math. Soc., 290 (1985), 483. doi: 10.1090/S0002-9947-1985-0792808-4. Google Scholar [2] D. Bonheure, F. Obersnel and P. Omari, Heteroclinic solutions of the prescribed curvature equation with a double-well potential,, preprint, (2011). Google Scholar [3] D. Bonheure, P. Habets, F. Obersnel and P. Omari, Classical and non-classical solutions of a prescribed curvature equation,, J. Differential Equations, 243 (2007), 208. doi: 10.1016/j.jde.2007.05.031. Google Scholar [4] D. Bonheure, P. Habets, F. Obersnel and P. Omari, Classical and non-classical positive solutions of a prescribed curvature equation with singularities,, Rend. Istit. Mat. Univ. Trieste, 39 (2007), 63. Google Scholar [5] G. Buttazzo, M. Giaquinta and S. Hildebrandt, "One-dimensional Variational Problems. An Introduction,'', Clarendon Press, (1998). Google Scholar [6] K. C. Chang, The spectrum of the 1-Laplace operator,, Commun. Contemp. Math., 11 (2009), 865. doi: 10.1142/S0219199709003570. Google Scholar [7] M. Emmer, Esistenza, unicità e regolarità nelle superfici di equilibrio nei capillari,, Ann. Univ. Ferrara Sez. VII (N.S.), 18 (1973), 79. Google Scholar [8] C. Gerhardt, Existence and regularity of capillary surfaces,, Boll. Un. Mat. Ital. (4), 10 (1974), 317. Google Scholar [9] C. Gerhardt, Existence, regularity, and boundary behavior of generalized surfaces of prescribed mean curvature,, Math. Z., 139 (1974), 173. doi: 10.1007/BF01418314. Google Scholar [10] M. Giaquinta, Regolarità delle superfici $BV$ con curvatura media assegnata,, Boll. Un. Mat. Ital. (4), 8 (1973), 567. Google Scholar [11] E. Giusti, "Minimal Surfaces and Functions of Bounded Variations,", Birkhäuser, (1984). Google Scholar [12] P. Habets and P. Omari, Multiple positive solutions of a one-dimensional prescribed mean curvature problem,, Commun. Contemp. Math., 9 (2007), 701. doi: 10.1142/S0219199707002617. Google Scholar [13] A. Hammerstein, Nichtlineare Integralgleichungen nebst Anwendungen,, Acta Math., 54 (1930), 117. doi: 10.1007/BF02547519. Google Scholar [14] V. K. Le, Some existence results on non-trivial solutions of the prescribed mean curvature equation,, Adv. Nonlinear Stud., 5 (2005), 133. Google Scholar [15] V. K. Le, Variational method based on finite dimensional approximation in a generalized prescribed mean curvature problem,, J. Differential Equations, 246 (2009), 3559. doi: 10.1016/j.jde.2008.11.015. Google Scholar [16] U. Massari, Esistenza e regolarità delle ipersuperficie di curvatura media assegnata in $\RR^n$,, Arch. Rational Mech. Anal., 55 (1974), 357. doi: 10.1007/BF00250439. Google Scholar [17] J. Mawhin, J. R. Ward Jr. and M. Willem, Variational methods and semilinear elliptic equations,, Arch. Rational Mech. Anal., 95 (1986), 269. doi: 10.1007/BF00251362. Google Scholar [18] A. Mellet and J. Vovelle, Existence and regularity of extremal solutions for a mean-curvature equation,, J. Differential Equations, 249 (2010), 37. doi: 10.1016/j.jde.2010.03.026. Google Scholar [19] M. Miranda, Dirichlet problem with L 1 data for the non-homogeneous minimal surface equation,, Indiana Univ. Math. J., 24 (): 227. doi: 10.1512/iumj.1974.24.24020. Google Scholar [20] F. Obersnel, Classical and non-classical sign changing solutions of a one-dimensional autonomous prescribed curvature equation,, Adv. Nonlinear Stud., 7 (2007), 1. Google Scholar [21] F. Obersnel and P. Omari, Existence and multiplicity results for the prescribed mean curvature equation via lower and upper solutions,, Differential Integral Equations, 22 (2009), 853. Google Scholar [22] F. Obersnel and P. Omari, Positive solutions of the Dirichlet problem for the prescribed mean curvature equation,, J. Differential Equations, 249 (2010), 1674. doi: 10.1016/j.jde.2010.07.001. Google Scholar [23] F. Obersnel, P. Omari and S. Rivetti, Existence, regularity and stability properties of periodic solutions of a capillarity equation in the presence of lower and upper solutions,, Nonlinear Anal. Real World Appl., 13 (2012), 2830. doi: 10.1016/j.nonrwa.2012.04.012. Google Scholar [24] L. Schwartz, Les théorèmes de Whitney sur les fonctions différentiables,, Séminaire Bourbaki, 1 (1995), 355. Google Scholar [25] J. Serrin, The problem of Dirichlet for quasilinear elliptic differential equations with many independent variables,, Philos. Trans. Roy. Soc. London Ser. A, 264 (1969), 413. doi: 10.1098/rsta.1969.0033. Google Scholar
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