Theory of Dense Hydrogen and Correlated Quantum and Classical Systems

9619854 Ashcroft这个理论资助支持一个基础广泛的研究计划，涉及凝聚态系统的各种性质。 有三个具体的课题要研究：致密和金属氢;一般多体理论;和，密度泛函理论。 理论研究将对致密氢和金属氢进行，包括致密流体氢的传输特性;新的对称性破缺状态;配对;以及质子配对的持久性。 根据一般多体理论，主题将包括有效的电子-电子相互作用在减少的维度;分层系统的不稳定性;两个组件的量子系统和广义缩放;重温锂作为模型系统的Eliashberg方程的超导性;和，氦在周期性领域。 密度泛函理论的主题将包括富勒烯和嵌入富勒烯的研究; Born-Green方程;平均离子混合规则;动态晶态的统计描述;以及粗粒化和不均匀电子气。 这个理论资助涉及凝聚态物理学的各种主题的研究-研究原子和分子在凝聚态，如液体和固体。 目前特别感兴趣的将是对氢的研究，氢是宇宙中最丰富的元素，通常处于气态，当它进入金属状态时，它的性质可以导电。 其他研究课题将包括超导性和富勒烯-一种新形式的碳的研究。 ***

9619854 Ashcroft This theoretical grant supports a broad-based research program dealing with various properties of condensed matter systems. There are three specific topics to be studied: dense and metallic hydrogen; general many-body theory; and, density functional theory. Theoretical studies will be done on dense and metallic hydrogen and will include transport properties of dense fluid hydrogen; novel broken symmetry states; pairing of pairs; and, persistence of proton-pairing. Under general many-body theory, topics will include effective electron- electron interactions in reduced dimensions; instabilities in layered systems; two-component quantum systems and generalized scaling; revisiting lithium as a model system for Eliashberg equations of superconductivity; and, helium in a periodic field. Topics in density functional theory will include studies of fullerenes and intercalated fullerenes; the Born-Green equation; the average-ion mixing rule; statistical description of the dynamic crystalline state; and, coarse graining and the inhomogeneous electron gas. %%% This theoretical grant involves research on a wide variety of topics from condensed matter physics - the study of atoms and molecules in condensed states such as liquids and solids. Of particular current interest will be the study of hydrogen, the most abundant element in the universe and usually in a gaseous state, and its properties as it enters a metallic state in which it can conduct electricity. Other topics of study will include superconductivity and the study of fullerenes - a new form of carbon. ***