Rogue Aid? The Determinants of China's Aid Allocation

Foreign aid from China is often characterized as ‘rogue aid’ that is not guided by recipient need but by China’s national interests alone. However, no econometric study so far confronts this claim with data. We make use of various datasets, covering the 1956-2006 period, to empirically test to which extent political and commercial interests shape China’s aid allocation decisions. We estimate the determinants of China’s allocation of project aid, food aid, medical teams and total aid money to developing countries, comparing its allocation decisions with traditional and other so-called emerging donors. We find that political considerations are an important determinant of China’s allocation of aid. However, in comparison to other donors, China does not pay substantially more attention to politics. In contrast to widespread perceptions, we find no evidence that China’s aid allocation is dominated by natural resource endowments. Moreover, China’s allocation of aid seems to be widely independent of democracy and governance in recipient countries. Overall, denominating aid from China as ‘rogue aid’ seems unjustified.aid allocation, China’s foreign aid, new donors, donor motives

Spectra of 4D, N=1 Type I String Vacua on Non-Toroidal CY Threefolds

We compute the massless spectra of some four dimensional, N=1 supersymmetric compactifications of the type I string. The backgrounds are non-toroidal Calabi-Yau manifolds described at special points in moduli space by Gepner models. Surprisingly, the abstract conformal field theory computation reveals Chan-Paton gauge groups as big as SO(12) x SO(20) or SO(8)^4 x SO(4)^3.Comment: minor corrections, some comments incorporated, some references adde

Integrable structures and the quantization of free null initial data for gravity

Variables for constraint free null canonical vacuum general relativity are presented which have simple Poisson brackets that facilitate quantization. Free initial data for vacuum general relativity on a pair of intersecting null hypersurfaces has been known since the 1960s. These consist of the "main" data which are set on the bulk of the two null hypersurfaces, and additional "surface" data set only on their intersection 2-surface. More recently the complete set of Poisson brackets of such data has been obtained. However the complexity of these brackets is an obstacle to their quantization. Part of this difficulty may be overcome using methods from the treatment of cylindrically symmetric gravity. Specializing from general to cylindrically symmetric solutions changes the Poisson algebra of the null initial data surprisingly little, but cylindrically symmetric vacuum general relativity is an integrable system, making powerful tools available. Here a transformation is constructed at the cylindrically symmetric level which maps the main initial data to new data forming a Poisson algebra for which an exact deformation quantization is known. (Although an auxiliary condition on the data has been quantized only in the asymptotically flat case, and a suitable representation of the algebra of quantum data by operators on a Hilbert space has not yet been found.) The definition of the new main data generalizes naturally to arbitrary, symmetryless gravitational fields, with the Poisson brackets retaining their simplicity. The corresponding generalization of the quantization is however ambiguous and requires further analysis.Comment: 40 pages, 4 figure