# American Institute of Mathematical Sciences

January  2013, 33(1): 67-87. doi: 10.3934/dcds.2013.33.67

## Slow motion for equal depth multiple-well gradient systems: The degenerate case

 1 UPMC-Paris6, UMR 7598 LJLL, Paris, F-75005, France, France

Received  May 2011 Revised  December 2011 Published  September 2012

We extend the study [1] of gradient systems with equal depth multiple-well potentials to the case when some of the wells are degenerate, in the sense that the Hessian is non positive at those wells. The exponentially small speed, in terms of distances between fronts, typical of non degenerate potentials is replaced by an algebraic upper bound, whose degree depends on the degeneracy of the wells.
Citation: Fabrice Bethuel, Didier Smets. Slow motion for equal depth multiple-well gradient systems: The degenerate case. Discrete & Continuous Dynamical Systems - A, 2013, 33 (1) : 67-87. doi: 10.3934/dcds.2013.33.67
##### References:
 [1] F. Bethuel, G. Orlandi and D. Smets, Slow motion for gradient systems with equal depth multiple-well potentials,, J. Differential Equations, 250 (2011), 53.   Google Scholar [2] L. Bronsard and R. V. Kohn, On the slowness of phase boundary motion in one space dimension,, Comm. Pure Appl. Math., 43 (1990), 983.  doi: 10.1002/cpa.3160430804.  Google Scholar [3] J. Carr and R. L. Pego, Metastable patterns in solutions of u t=ε2 $u_{x x}$ - f（u）, Comm. Pure Appl. Math., 42 (1989), 523.  doi: 10.1002/cpa.3160420502.  Google Scholar [4] X. Chen, Generation, propagation, and annihilation of metastable patterns,, J. Differential Equations, 206 (2004), 399.  doi: 10.1016/j.jde.2004.05.017.  Google Scholar [5] F. Otto and M. G. Reznikoff, Slow motion of gradient flows,, J. Differential Equations, 237 (2007), 372.  doi: 10.1016/j.jde.2007.03.007.  Google Scholar

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##### References:
 [1] F. Bethuel, G. Orlandi and D. Smets, Slow motion for gradient systems with equal depth multiple-well potentials,, J. Differential Equations, 250 (2011), 53.   Google Scholar [2] L. Bronsard and R. V. Kohn, On the slowness of phase boundary motion in one space dimension,, Comm. Pure Appl. Math., 43 (1990), 983.  doi: 10.1002/cpa.3160430804.  Google Scholar [3] J. Carr and R. L. Pego, Metastable patterns in solutions of u t=ε2 $u_{x x}$ - f（u）, Comm. Pure Appl. Math., 42 (1989), 523.  doi: 10.1002/cpa.3160420502.  Google Scholar [4] X. Chen, Generation, propagation, and annihilation of metastable patterns,, J. Differential Equations, 206 (2004), 399.  doi: 10.1016/j.jde.2004.05.017.  Google Scholar [5] F. Otto and M. G. Reznikoff, Slow motion of gradient flows,, J. Differential Equations, 237 (2007), 372.  doi: 10.1016/j.jde.2007.03.007.  Google Scholar
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