Double expansion in asymptotically free theories

I propose an approximation scheme for asymptotically free field theories combining both weak coupling and strong coupling series. The weak coupling expansion is used to integrate the high frequency modes and the resulting low energy effective theory is solved using the strong coupling expansion. In some models there exists an intermediate scale at which both expansions make sense. The method is tested on few low dimensional models for which an exact solution is known.Comment: 15 pages, written in LaTeX, figures generated using FEYNMANN are commented and can be obtained upon request

Impact of the 2015 U.S. Dollar Rise on Export Prices and on the Agricultural Industry

U.S. export prices experienced a major decline in 2015, as evidenced by the Bureau of Labor Statistics (BLS) export price index. Prices for U.S. exports, published in dollar terms, decreased 6.6 percent in 2015, the largest calendar-year decline since the index was first published in 1983. However, the large decline in the U.S. dollar export price index did not tell the entire story. When measured in foreign currency terms, export prices were actually higher because of the strong dollar. The value of the dollar strengthened against the euro, Japanese yen, Chinese yuan, and Canadian dollar. Continued slow global economic and trade growth dampened demand for U.S. exports and influenced U.S. export price trends. The meeting of the strong dollar and lackluster demand for U.S. exports was particularly challenging for the U.S. agricultural industry. This Beyond the Numbers article analyzes what impact the strengthening dollar had on certain agricultural commodities

Amplitude Zeroes in Collinear Processes or What Is Left from a Factorizable 2d Model in Higher Dimensions

We show that for collinear processes, i.e. processes where the incoming and outgoing momenta are aligned along the same line, the S-matrix of the tree level 2+1 dimensional Thirring model factorizes: any S - matrix element is a product of $2\rightarrow 2$ elements. In particular this means nullification of all collinear $2 \rightarrow n$ amplitudes for $n > 2$.Comment: latex , 8 pp., 2 fig. not include

Global Security, Climate Change, and the Arctic

This issue of Swords and Ploughshares examines the complex set of global security challenges that are emerging as a result of warmer temperatures and melting ice in the Arctic region. For policymakers and analysts alike, the contemporary Arctic presents a particularly acute convergence of compelling problems and opportunities related to global security, foreign affairs, climate change, environmentalism, international law, energy economics, and the rights of indigenous populations. The goals of this publication are two-fold: to provide thoughtful analysis of recent developments in the Arctic both from scientific and geopolitical perspectives; and to offer careful and informed assessments of how evolving conditions in the Arctic might impact the broader global security framework and relations between the international actors involved, not to mention the region’s inhabitants and ecosystem. The articles in this issue were contributed by each of four panelists invited by the Program in Arms Control, Disarmament, and International Security (ACDIS), the European Union Center, and the Russian, East European, and Eurasian Center at the University of Illinois to participate in a November 2009 symposium entitled “Global Security, Climate Change, and the Arctic: Implications of an Open Northwest Passage.” The symposium and this publication were supported through grants to the host centers from the European Commission, the US Department of Education (Title VI international education program), and the John D. and Catherine T. MacArthur Foundation.published or submitted for publicationnot peer reviewe