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• Equation of State: This team manages the SESAME equation of state (EOS) library,  interacts with internal and external SESAME users, maintains and updates the codes used to generate equations of state, and performs research on a wide variety of areas related to EOS.  Research areas include electronic structure theory, models of nuclear and electronic contributions to an EOS, material properties such as bulk and shear moduli, and shock physics needed to generate equations of state. The team also provides a focal point for other theoretical and experimental groups, both internal and external to the Laboratory, working on EOS research.  ( Burakovsky, Chisolm, Crockett, Johnson, Niklasson, Wallace, Wills )    (more)

 

• Liquid Dynamics: We have developed a theory of the dynamics of monatomic liquids in which the atoms in a liquid oscillate in many-body harmonic valleys, occasionally moving from one valley to another in a motion we call a "transit."  This theory accounts well for the equilibrium thermodynamic behavior of such liquids, and we have also used it to develop a theory of the velocity autocorrelation function, which determines the liquid's self-diffusion coefficient. We are currently studying the dynamic structure factor, which can be measured by neutron scattering experiments, and other correlation functions which determine the remaining transport coefficients of the liquid. ( Chisolm, Lorenzi-Venneri, Wallace )

 

• Mechanics of Materials: The Mechanics of Materials Group in T-1 are theoretical physicists engaged in doing research on the thermal and mechanical properties of metals, ceramics, polymers and composites. A primary mission of the group is to develop physics-based mesoscopic and continuum-level theories. The team is concerned with dynamic deformations ranging from quasi-static to shock loading.  Material properties being investigated include elastic, plastic, viscoelastic, ductile and brittle fracture, melting, phase transitions, and aging.  The materials team works closely  with inter-divisional participants  including experimental materials scientists and simulations groups.
  ( Burakovsky, Clements, Gammel, Mas )