Reference-State One-Particle Density-Matrix Theory

A density-matrix formalism is developed based on the one-particle density-matrix of a single-determinantal reference-state. The v-representable problem does not appear in the proposed method, nor the need to introduce functionals defined by a constrained search. The correlation-energy functionals are not universal; they depend on the external potential. Nevertheless, model systems can still be used to derive universal energy-functionals. In addition, the correlation-energy functionals can be partitioned into individual terms that are -- to a varying degree -- universal; yielding, for example, an electron gas approximation. Variational and non-variational energy functionals are introduced that yield the target-state energy when the reference state -- or its corresponding one-particle density matrix -- is constructed from Brueckner orbitals. Using many-body perturbation theory, diagrammatic expansions are given for the non-variational energy-functionals, where the individual diagrams explicitly depend on the one-particle density-matrix. Non-variational energy-functionals yield generalized Hartree--Fock equations involving a non-local correlation-potential and the Hartree--Fock exchange; these equations are obtained by imposing the Brillouin--Brueckner condition. The same equations -- for the most part -- are obtained from variational energy-functionals using functional minimizations, yielding the (kernel of) correlation potential as the functional derivative of correlation-energy functionals. Approximations for the correlation-energy functions are introduced, including a one-particle-density-matrix variant of the local-density approximation (LDA) and a variant of the Lee--Yang--Parr (LYP) functional.Comment: 68 Page, 0 Figures, RevTeX 4, Submitted to Phys.Rev.A (on April 28 2003

Java\u27s Last Night

He might have been your neighbor, or your boyfriend, or just the fellow you see clattering along in a Model A Ford any place in the country where college boys take the gang home from football games. He might have been, but now he was no part of that former life

"Who Are We? Where Are We?": Contact and Literary Navigation in The Maine Woods

This essay argues that Thoreau witnesses a series of clashes across the three essays collected in "The Maine Woods" and that Thoreau positions himself with a variety of contact zones, enabling him both to navigate the landscapes of northern Maine and recount his experiences to his audiences

Student Voice?: An ethnography of activist women of color and the Daily Illini's negative representation of student activism.

Women of color have historically been active players in social movements in the United States (U.S.). Because of this, women of color are oftentimes the targets of negative media representation or absent from any form of representation entirely. My research examines how these women of color, student activists perceive their own activism in relation to the mass media representation, in this case the Daily Illini (DI). There is a hidden power in media, which gives media a privileged position in discourse. From preliminary research, I learned that the DI uses its privilege in a biased way: in reporting on student activism, they favor administration and faculty over the students. Studying how women of color internalize this marginalization afflicted on them by the DI???s media representation will reveal how influential and powerful this media outlet is or is not to Black women student activists, a group that is commonly oppressed on multiple levels. The results of this work will demonstrate the variability in power relations and influence between the DI and the subjects of its columns.unpublishe

Henry David Thoreau in Context

Well known for his contrarian and solitary posture, Henry David Thoreau was nonetheless deeply responsive to the world around him. Tracing a wide range of geographic, intellectual, cultural, political, and scientific contexts, this volume brings together leading scholars of Thoreau and nineteenth-century American literature and culture who provide original research, valuable synthesis of historical and scholarly sources, and innovative readings of Thoreau’s texts. The thirty-four chapters contained herein reveal a Thoreau deeply concerned with and shaped by diverse landscapes, intellectual and literary traditions, social issues, and modes of scientific practice. Essays also illuminate important posthumous contexts and consider the specific challenges of contextualizing Thoreau. A resource for students, teachers, general readers, and scholars, the volume provides a rich understanding of Thoreau and nineteenth-century literature, political activism, and environmentalist thinking