123,900 research outputs found
Quaternionic Kähler Detour Complexes and Supersymmetric Black Holes
No full textWe study a class of supersymmetric spinning particle models derived from the radial quantization of stationary, spherically symmetric black holes of four dimensional N = 2 supergravities. By virtue of the c-map, these spinning particles move in quaternionic Kähler manifolds. Their spinning degrees of freedom describe mini-superspace-reduced supergravity fermions. We quantize these models using BRST detour complex technology. The construction of a nilpotent BRST charge is achieved by using local (worldline) supersymmetry ghosts to generate special holonomy transformations. (An interesting byproduct of the construction is a novel Dirac operator on the superghost extended Hilbert space.) The resulting quantized models are gauge invariant field theories with fields equaling sections of special quaternionic vector bundles. They underly and generalize the quaternionic version of Dolbeault cohomology discovered by Baston. In fact, Baston's complex is related to the BPS sector of the models we write down. Our results rely on a calculus of operators on quaternionic Kähler manifolds that follows from BRST machinery, and although directly motivated by black hole physics, can be broadly applied to any model relying on quaternionic geometry. © 2011 The Author(s)
Peter C. Perdue, China Marches West. The Qing Conquest of Central Eurasia, 2005
No full textWaldron Arthur. Peter C. Perdue, China Marches West. The Qing Conquest of Central Eurasia, 2005. In: Études chinoises, n°24, 2005. pp. 491-501
Peter C. Perdue, China Marches West. The Qing Conquest of Central Eurasia, 2005
No full textWaldron Arthur. Peter C. Perdue, China Marches West. The Qing Conquest of Central Eurasia, 2005. In: Études chinoises, n°24, 2005. pp. 491-501
T. Waldron, Counting the Dead. The epidemiology of skeletal populations
No full textHadjouis Djillali. T. Waldron, Counting the Dead. The epidemiology of skeletal populations. In: L'Homme, 1996, tome 36 n°139. pp. 190-191
On the spacing of Fekete points for a sphere, ball or simplex
No full textAbstractSuppose that K ⊂ ℝd is either the unit ball, the unit sphere or the standard simplex. We show that there are constants c1, c2 > 0 such that for a set of Fekete points (maximizing the Vandermonde determinant) of degree n, Fn ⊂ K, for all a ∈ Fn. Here dist(a, b) is a natural distance on K that will be described in the text
Jeremy Waldron, Liberal Rights. Collected Papers 1981-1991
No full textBerten André. Jeremy Waldron, Liberal Rights. Collected Papers 1981-1991. In: Revue Philosophique de Louvain. Quatrième série, tome 97, n°3-4, 1999. pp. 699-702
Pseudometrics, distances and multivariate polynomial inequalities
No full textAbstractWe discuss three natural pseudodistances and pseudometrics on a bounded domain in RN based on polynomial inequalities
Jeremy Waldron, Liberal Rights. Collected Papers 1981-1991
No full textBerten André. Jeremy Waldron, Liberal Rights. Collected Papers 1981-1991. In: Revue Philosophique de Louvain. Quatrième série, tome 97, n°3-4, 1999. pp. 699-702
Mary Waldron, Jane Austen and the Fiction of Her Time
No full textLaprévotte Guy. Mary Waldron, Jane Austen and the Fiction of Her Time. In: XVII-XVIII. Bulletin de la société d'études anglo-américaines des XVIIe et XVIIIe siècles. N°51, 2000. pp. 382-388
Urea distribution and uptake in the Atlantic Ocean between 50° N and 50°S.
No full textWe investigate the distribution of urea and its uptake by phytoplankton during 3 meridional
transects of the Atlantic Ocean between 50°N and 50° S. Significant relationships were identified
between urea uptake and Prochlorococcus abundance (p < 0.01) in the northern subtropical
Atlantic, where Prochlorococcus appears likely to dominate urea uptake, and between urea concentration
and the <200 µm microplankton biomass fraction (p < 0.005) in the South Atlantic, which may
be associated with the production of urea. These results suggest that the distribution of urea in the
subtropical ocean may be controlled by regional imbalances between urea consumption and urea
production. In parallel with these simple relationships significant spring-autumn seasonal changes in
the distribution of urea were identified in southern subtropical and tropical latitudes. Urea was twice
as abundant during local spring than during local autumn in the subtropical South Atlantic but 2.5
times more abundant in equatorial waters during the boreal autumn period. Euphotic zone integrated
urea uptake rates also varied seasonally, being considerably higher in the North Atlantic temperate
and subtropical latitudes during the boreal spring whilst in the subtropical South Atlantic urea
uptake peaked in local autumn
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