The improved 10th order QED expression for a_{\mu} : new results and related estimates

New estimates of the 10th order QED corrections to the muon anomalous magnetic moment are presented. The estimates include the information on definite improved 10th order QED contributions to $a_{\mu}$, calculated by Kinoshita and Nio. The final estimates are in good agreement with the ones, given recently by Kinoshita.Comment: Presented at Working Group 4 of 7th Int. Workshop on Neutrino Factories and Superbeams NuFact05, Frascati 21-26 June 2005; 3 double column pages, LaTe

New branch of Kaluza-Klein compactification

We found a new branch of solutions in Freund-Rubin type flux compactifications. The geometry of these solutions is described as the external space which has a de Sitter symmetry and the internal space which is topologically spherical. However, it is not a simple form of dS_p x S^q but a warped product of de Sitter space and a deformed sphere. We explicitly constructed numerical solutions for a specific case with p=4 and q=4. We show that the new branch of solutions emanates from the marginally stable solution in the branch of dS_4 x S^4 solutions.Comment: 6 pages, 3 figures, REVTeX4;version accepted for publication in PR

The Analytical Contribution of Some Eighth-Order Graphs Containing Vacuum Polarization Insertions to the Muon (G-2) in QED

The contributions to the $g-2$ of the muon from some eighth-order (four-loop) graphs containing one-loop and two-loop vacuum polarization insertions have been evaluated analytically in QED perturbation theory, expanding the results in the ratio of the electron to muon mass ${(m_e / m_\mu)}$. The results agree with the numerical evaluations and the asymptotic analytical results already existing in the literature.Comment: plain TEX, 10 pages + 3 figures (figures are available upon request), DFUB 93-0

R&D and Technology Spillovers via FDI: Innovation and Absorptive Capacity

Two faces of R&D (innovation and learning) and technology spillovers from FDI (foreign direct investment) on a firm's productivity growth are examined in this paper. Using firm-level panel data on Czech manufacturing firms between 1995 and 1998, I find that: (i) the learning effect of R&D is far more important than the innovative effect in explaining the productivity growth of a firm, (ii) there is no evidence of technology spillovers to local firms from having a foreign joint venture partner, (iii) positive spillovers from FDI are found in electrical machinery and radio & TV sectors, which are also active investors in innovative R&D.http://deepblue.lib.umich.edu/bitstream/2027.42/39733/3/wp349.pd