Perceptions of Healthcare, Health Status, and Discrimination Among African-American Veterans

The Institute of Medicine identified access to healthcare and race-based discrimination as important barriers to quality healthcare that contributes to health disparities. This study (1) describes African-American veterans’ perceptions of healthcare services and perceived discrimination in healthcare and (2) investigates the relationship between perceived discrimination and patient perceptions of care, satisfaction with healthcare, and health status. A convenience sample of 141 African-American veterans in Boston completed surveys from May to June 2006. Respondents reported an average of 16 lifetime experiences of discrimination and over half recalled a situation when they experienced discrimination in healthcare. Modest ratings of perceived quality of care, and satisfaction with healthcare reflect areas for improvement. Perceived healthcare discrimination was negatively and significantly associated with satisfaction (p\u3c0.001), perceived quality of care (p\u3c0.01), and physical functioning (p\u3c0.05). Policies eliminating discrimination in healthcare are needed to improve patient satisfaction, quality of care, and health outcomes of African- American veterans

Positive Cosmological Constant and Quantum Theory

We argue that quantum theory should proceed not from a spacetime background but from a Lie algebra, which is treated as a symmetry algebra. Then the fact that the cosmological constant is positive means not that the spacetime background is curved but that the de Sitter (dS) algebra as the symmetry algebra is more relevant than the Poincare or anti de Sitter ones. The physical interpretation of irreducible representations (IRs) of the dS algebra is considerably different from that for the other two algebras. One IR of the dS algebra splits into independent IRs for a particle and its antiparticle only when Poincare approximation works with a high accuracy. Only in this case additive quantum numbers such as electric, baryon and lepton charges are conserved, while at early stages of the Universe they could not be conserved. Another property of IRs of the dS algebra is that only fermions can be elementary and there can be no neutral elementary particles. The cosmological repulsion is a simple kinematical consequence of dS symmetry on quantum level when quasiclassical approximation is valid. Therefore the cosmological constant problem does not exist and there is no need to involve dark energy or other fields for explaining this phenomenon (in agreement with a similar conclusion by Bianchi and Rovelli).Comment: 44 pages, Latex, no figures. A revised version published in Symmetry, Special Issue: Quantum Symmetr

Introduction to a Quantum Theory over a Galois Field

We consider a quantum theory based on a Galois field. In this approach infinities cannot exist, the cosmological constant problem does not arise, and one irreducible representation (IR) of the symmetry algebra splits into independent IRs describing a particle an its antiparticle only in the approximation when de Sitter energies are much less than the characteristic of the field. As a consequence, the very notions of particles and antiparticles are only approximate and such additive quantum numbers as the electric, baryon and lepton charges are conserved only in this approximation. There can be no neutral elementary particles and the spin-statistics theorem can be treated simply as a requirement that standard quantum theory should be based on complex numbers.Comment: 43 pages, Latex, 1 figur

Dual Theories: ‘Same But Different’ or ‘Different But Same’?

I argue that, under the glitz, dual theories are examples of theoretically equivalent descriptions of the same underlying physical content: I distinguish them from cases of genuine underdetermination on the grounds that there is no real incompatibility involved between the descriptions. The incompatibility is at the level of unphysical structure. I argue that dual pairs are in fact very strongly analogous to gauge- related solutions even for dual pairs that look the most radically distinct, such as AdS/CFT

Dual Theories: ‘Same But Different’ or ‘Different But Same’?

I argue that, under the glitz, dual theories are examples of theoretically equivalent descriptions of the same underlying physical content: I distinguish them from cases of genuine underdetermination on the grounds that there is no real incompatibility involved between the descriptions. The incompatibility is at the level of unphysical structure. I argue that dual pairs are in fact very strongly analogous to gauge- related solutions even for dual pairs that look the most radically distinct, such as AdS/CFT

Public Health

Public health involves the application of a wide variety of scientific and non-scientific disciplines to the very practical problems of improving population health and preventing disease. Public health has received surprisingly little attention from philosophers of science. In this chapter we consider some neglected but important philosophical aspects of the science of public health

Industry's Role in Pollution Abatement

Talk by Robert N. Rickles, Director of Pollution Abatement for Celanese Corporatio

Time in quantum gravity

Quantum gravity--the marriage of quantum physics with general relativity--is bound to contain deep and important lessons for the nature of physical time. Some of these lessons shall be canvassed here, particularly as they arise from quantum general relativity and string theory and related approaches. Of particular interest is the question of which of the intuitive aspects of time will turn out to be fundamental, and which 'emergent' in some sense.Comment: 18 pages, 1 figur