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Variational analysis of liquid crystals. (English) Zbl 07802844

Summary: This is an exposition of the role played by the calculus of variations in the field of liquid crystals, in particular the way it provides a sound foundation to the mathematical modelling and numerical study of their response to the confining material’s geometry and to external electromagnetic stimuli.

MSC:

49J53 Set-valued and variational analysis
35B36 Pattern formations in context of PDEs
49S05 Variational principles of physics
49J10 Existence theories for free problems in two or more independent variables
49J45 Methods involving semicontinuity and convergence; relaxation
49K10 Optimality conditions for free problems in two or more independent variables
49K20 Optimality conditions for problems involving partial differential equations
49K30 Optimality conditions for solutions belonging to restricted classes (Lipschitz controls, bang-bang controls, etc.)
49N60 Regularity of solutions in optimal control
82B21 Continuum models (systems of particles, etc.) arising in equilibrium statistical mechanics
82D30 Statistical mechanics of random media, disordered materials (including liquid crystals and spin glasses)