# American Institute of Mathematical Sciences

February  2013, 6(1): 215-233. doi: 10.3934/dcdss.2013.6.215

## Thermalization of rate-independent processes by entropic regularization

 1 Applied & Computational Mathematics and Graduate Aerospace Laboratories, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125-9400, United States 2 School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907-2088, United States 3 Mathematics Institute, University of Warwick, Coventry, CV4 7AL, United Kingdom 4 Graduate Aerospace Laboratories, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, United States

Received  May 2011 Revised  July 2011 Published  October 2012

We consider the effective behaviour of a rate-independent process when it is placed in contact with a heat bath. The method used to thermalize'' the process is an interior-point entropic regularization of the Moreau--Yosida incremental formulation of the unperturbed process. It is shown that the heat bath destroys the rate independence in a controlled and deterministic way, and that the effective dynamics are those of a non-linear gradient descent in the original energetic potential with respect to a different and non-trivial effective dissipation potential.
Citation: T. J. Sullivan, M. Koslowski, F. Theil, Michael Ortiz. Thermalization of rate-independent processes by entropic regularization. Discrete & Continuous Dynamical Systems - S, 2013, 6 (1) : 215-233. doi: 10.3934/dcdss.2013.6.215
##### References:
 [1] L. Ambrosio, N. Gigli and G. Savaré, "Gradient Flows in Metric Spaces and in the Space of Probability Measures,", Lectures in Mathematics ETH Zürich, (2008).   Google Scholar [2] S. Boyd and L. Vandenberghe, "Convex Optimization,", Cambridge University Press, (2004).   Google Scholar [3] R. Jordan and D. Kinderlehrer, An extended variational principle,, Partial Differential Equations and Applications, 177 (1996), 187.   Google Scholar [4] R. Jordan, D. Kinderlehrer and F. Otto, The variational formulation of the Fokker-Planck equation,, SIAM J. Math. Anal., 29 (1998), 1.   Google Scholar [5] M. Koslowski, "A Phase-Field Model of Dislocations in Ductile Single Crystals,", Ph. D. thesis, (2003).   Google Scholar [6] A. Mielke, Evolution of rate-independent systems,, Evolutionary Equations. Handb. Differ. Equ., II (2005), 461.   Google Scholar [7] \bysame, Modeling and analysis of rate-independent processes,, January 2007, (2007).   Google Scholar [8] A. Mielke, R. Rossi and G. Savaré, Modeling solutions with jumps for rate-independent systems on metric spaces,, Discrete Contin. Dyn. Syst., 25 (2009), 585.   Google Scholar [9] A. Mielke and F. Theil, On rate-independent hysteresis models,, NoDEA Nonlinear Differential Equations Appl., 11 (2004), 151.   Google Scholar [10] J. J. Moreau, Proximité et dualité dans un espace hilbertien,, Bull. Soc. Math. France, 93 (1965), 273.   Google Scholar [11] J. P. Penot and M. Théra, Semicontinuous mappings in general topology,, Arch. Math. (Basel), 38 (1982), 158.   Google Scholar [12] D. Preiss, Geometry of measures in $\mathbbR^n$distribution, rectifiability, and densities: ,, Ann. of Math., 125 (1987), 537.   Google Scholar [13] T. J. Sullivan, "Analysis of Gradient Descents in Random Energies and Heat Baths,", Ph. D. thesis, (2009).   Google Scholar [14] T. J. Sullivan, M. Koslowski, F. Theil and M. Ortiz, On the behavior of dissipative systems in contact with a heat bath: application to Andrade creep,, J. Mech. Phys. Solids, 57 (2009), 1058.   Google Scholar [15] K. Yosida, "Functional Analysis,", Die Grundlehren der Mathematischen Wissenschaften, (1965).   Google Scholar

show all references

##### References:
 [1] L. Ambrosio, N. Gigli and G. Savaré, "Gradient Flows in Metric Spaces and in the Space of Probability Measures,", Lectures in Mathematics ETH Zürich, (2008).   Google Scholar [2] S. Boyd and L. Vandenberghe, "Convex Optimization,", Cambridge University Press, (2004).   Google Scholar [3] R. Jordan and D. Kinderlehrer, An extended variational principle,, Partial Differential Equations and Applications, 177 (1996), 187.   Google Scholar [4] R. Jordan, D. Kinderlehrer and F. Otto, The variational formulation of the Fokker-Planck equation,, SIAM J. Math. Anal., 29 (1998), 1.   Google Scholar [5] M. Koslowski, "A Phase-Field Model of Dislocations in Ductile Single Crystals,", Ph. D. thesis, (2003).   Google Scholar [6] A. Mielke, Evolution of rate-independent systems,, Evolutionary Equations. Handb. Differ. Equ., II (2005), 461.   Google Scholar [7] \bysame, Modeling and analysis of rate-independent processes,, January 2007, (2007).   Google Scholar [8] A. Mielke, R. Rossi and G. Savaré, Modeling solutions with jumps for rate-independent systems on metric spaces,, Discrete Contin. Dyn. Syst., 25 (2009), 585.   Google Scholar [9] A. Mielke and F. Theil, On rate-independent hysteresis models,, NoDEA Nonlinear Differential Equations Appl., 11 (2004), 151.   Google Scholar [10] J. J. Moreau, Proximité et dualité dans un espace hilbertien,, Bull. Soc. Math. France, 93 (1965), 273.   Google Scholar [11] J. P. Penot and M. Théra, Semicontinuous mappings in general topology,, Arch. Math. (Basel), 38 (1982), 158.   Google Scholar [12] D. Preiss, Geometry of measures in $\mathbbR^n$distribution, rectifiability, and densities: ,, Ann. of Math., 125 (1987), 537.   Google Scholar [13] T. J. Sullivan, "Analysis of Gradient Descents in Random Energies and Heat Baths,", Ph. D. thesis, (2009).   Google Scholar [14] T. J. Sullivan, M. Koslowski, F. Theil and M. Ortiz, On the behavior of dissipative systems in contact with a heat bath: application to Andrade creep,, J. Mech. Phys. Solids, 57 (2009), 1058.   Google Scholar [15] K. Yosida, "Functional Analysis,", Die Grundlehren der Mathematischen Wissenschaften, (1965).   Google Scholar
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