Effective field theories for heavy quarkonium

This article reviews recent theoretical developments in heavy-quarkonium physics from the point of view of effective-field theories of QCD. We discuss nonrelativistic QCD and concentrate on potential nonrelativistic QCD. The main goal will be to derive Schrödinger equations based on QCD that govern heavy-quarkonium physics in the weak- and strong-coupling regimes. Finally, the review discusses a selected set of applications, which include spectroscopy, inclusive decays, and electromagnetic threshold production.

Gauge transformations in Einstein-Yang-Mills theories

We discuss the relation between spacetime diffeomorphisms and gauge transformations in theories of the YangMills type coupled with Einsteins general relativity. We show that local symmetries of the Hamiltonian and Lagrangian formalisms of these generally covariant gauge systems are equivalent when gauge transformations are required to induce transformations which are projectable under the Legendre map. Although pure YangMills gauge transformations are projectable by themselves, diffeomorphisms are not. Instead, the projectable symmetry group arises from infinitesimal diffeomorphism-inducing transformations which must depend on the lapse function and shift vector of the spacetime metric plus associated gauge transformations. Our results are generalizations of earlier results by ourselves and by Salisbury and Sundermeyer. 2000 American Institute of Physics.

Interpretation of primary care physicians' attitude regarding rotavirus immunisation using diffusion of innovation theories.

To evaluate primary care physicians' attitude towards implementation of rotavirus (RV) immunisation into the Swiss immunisation schedule, an eight-question internet-based questionnaire was sent to the 3799 subscribers of InfoVac, a nationwide web-based expert network on immunisation issues, which reaches >95% of paediatricians and smaller proportions of other primary care physicians. Five demographic variables were also inquired. Descriptive statistics and multivariate analyses for the main outcome "acceptance of routine RV immunisation" and other variables were performed. Diffusion of innovation theory was used for data assessment. Nine-hundred seventy-seven questionnaires were returned (26%). Fifty percent of participants were paediatricians. Routine RV immunisation was supported by 146 participants (15%; so called early adopters), dismissed by 620 (64%), leaving 211 (21%) undecided. However, when asked whether they would recommend RV vaccination to parents if it were officially recommended by the federal authorities and reimbursed, 467 (48.5%; so called early majority) agreed to recommend RV immunisation. Multivariate analysis revealed that physicians who would immunise their own child (OR: 5.1; 95% CI: 4.1-6.3), hospital-based physicians (OR: 1.6; 95% CI: 1.1-2.3) and physicians from the French (OR: 1.6; 95% CI: 1.2-2.3) and Italian speaking areas of Switzerland (OR: 2.5; 95% CI: 1.1-5.8) were more likely to support RV immunisation. Diffusion of innovation theory predicts a >80% implementation if approximately 50% of a given population support an innovation. Introduction of RV immunisation in Switzerland is likely to be successful, if (i) the federal authorities issue an official recommendation and (ii) costs are covered by basic health care insurance.

Mourning becomes Electra d'Eugene O'Neill: Èsquil i Plató per a crear un drama fosc?

The fundamental debt of E. O'Neill's Mourning Becomes Electra to Aeschylus, and to a lesser degree to Sophocles and Euripides, has been always recognised but, according to the author's hypothesis, O'Neill might have taken advantage of the Platonic image of the cave in order to magnify his both Greek and American drama. It is certainly a risky hypothesis that stricto sensu cannot be proved, but it is also reader's right to evaluate the plausibility and the possible dramatic benefit derived from such a reading. Besides indicating to what degree some of the essential themes of Platonic philosophy concerning darkness, light or the flight from the prison of the material world are not extraneous to O'Neill's work, the author proves he was aware of the Platonic image of the cave thanks to its capital importance in the work of some of his intellectual mentors such as F. Nietzsche or Oscar Wilde. Nevertheless, the most significant aim of the author's article is to emphasize both the dramatic benefits and the logical reflections derived, as said before, from reading little by little O'Neill's drama bearing in mind the above mentioned Platonic parameter.

Mourning becomes Electra de Eugene O'Neill: ¿Esquilo y la caverna de Platón para crear un drama oscuro?

The fundamental debt of E. O'Neill's Mourning Becomes Electra to Aeschylus, and to a lesser degree to Sophocles and Euripides, has been always recognised but, according to the author's hypothesis, O'Neill might have taken advantage of the Platonic image of the cave in order to magnify his both Greek and American drama. It is certainly a risky hypothesis that stricto sensu cannot be proved, but it is also reader's right to evaluate the plausibility and the possible dramatic benefit derived from such a reading. Besides indicating to what degree some of the essential themes of Platonic philosophy concerning darkness, light or the flight from the prison of the material world are not extraneous to O'Neill's work, the author proves he was aware of the Platonic image of the cave thanks to its capital importance in the work of some of his intellectual mentors such as F. Nietzsche or Oscar Wilde. Nevertheless, the most significant aim of the author's article is to emphasize both the dramatic benefits and the logical reflections derived, as said before, from reading little by little O'Neill's drama bearing in mind the above mentioned Platonic parameter.

Bubbles in Kaluza-Klein theories with spacelike or timelike internal dimensions

region to the other. We also present a C-type solution that describes neutral bubbles in uniform acceleration, and we use it to construct an instanton that mediates the breaking of a cosmic string by forming bubbles at its ends. The rate for this process is also calculated. Finally, we argue that a similar solution can be constructed for magnetic bubbles, and that it can be used to describe a semiclassical instability of the two-timing vacuum against production of massless monopole pairs.

Particle and string fluid interpretation for the scalar sector of Kaluza-Klein theories

The scalar sector of the effective low-energy six-dimensional Kaluza-Klein theory is seen to represent an anisotropic fluid composed of two perfect fluids if the extra space metric has a Euclidean signature, or a perfect fluid of geometric strings if it has an indefinite signature. The Einstein field equations with such fluids can be explicitly integrated when the four-dimensional space-time has two commuting Killing vectors.

The Foundational Significance of Leggett's Non-local Hidden-Variable Theories

Laudisa (Found. Phys. 38:1110-1132, 2008) claims that experimental research on the class of non-local hidden-variable theories introduced by Leggett is misguided, because these theories are irrelevant for the foundations of quantum mechanics. I show that Laudisa's arguments fail to establish the pessimistic conclusion he draws from them. In particular, it is not the case that Leggett-inspired research is based on a mistaken understanding of Bell's theorem, nor that previous no-hidden-variable theorems already exclude Leggett's models. Finally, I argue that the framework of Bohmian mechanics brings out the importance of Leggett tests, rather than proving their irrelevance, as Laudisa supposes.

Trauma and disorganized attachment in refugee children : integrating theories and exploring treatment options

Refugee families incur many different types of stressors in the course of the phases prior to flight, those of flight, and resettlement. Multiple and varied negative life events and traumas, such as those experienced by refugee families, may give rise to negative changes in attachment between children and their parents. However, such negative changes in attachment may be countered through the use of culturally appropriate counselling theories and their respective interventions. The integration of attachment theory with family systems, trauma systems, and cognitive behavioural theories and the use of cognitive behavioural caregiver support, filial therapy training, and play therapy interventions are discussed as a treamtent framework for promoting more positive and secure attachments between refugee children and their caregivers.