401 research outputs found
100% RAG: Architectural Education | Historians and Critics, Volume 2, Number 6
100% RAG: Architectural Education | Historians and Critics, Syracuse School of Architecture, Student Newspaper, Volume 2, Number 6.
Student newsletter from student contributors of Syracuse School of Architecture in 1977
Lattice supersymmetry, superfields and renormalization
We study Euclidean lattice formulations of non-gauge supersymmetric models
with up to four supercharges in various dimensions. We formulate the conditions
under which the interacting lattice theory can exactly preserve one or more
nilpotent anticommuting supersymmetries. We introduce a superfield formalism,
which allows the enumeration of all possible lattice supersymmetry invariants.
We use it to discuss the formulation of Q-exact lattice actions and their
renormalization in a general manner. In some examples, one exact supersymmetry
guarantees finiteness of the continuum limit of the lattice theory. As a
consequence, we show that the desired quantum continuum limit is obtained
without fine tuning for these models. Finally, we discuss the implications and
possible further applications of our results to the study of gauge and
non-gauge models.Comment: 44 pages, 1 figur
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Ultrafast Time-Resolved Hard X-Ray Emission Spectroscopy on a Tabletop
Experimental tools capable of monitoring both atomic and electronic structure on ultrafast (femtosecond to picosecond) time scales are needed for investigating photophysical processes fundamental to light harvesting, photocatalysis, energy and data storage, and optical display technologies. Time-resolved hard x-ray (>3 keV) spectroscopies have proven valuable for these measurements due to their elemental specificity and sensitivity to geometric and electronic structures. Here, we present the first tabletop apparatus capable of performing time-resolved x-ray emission spectroscopy. The time resolution of the apparatus is better than 6 ps. By combining a compact laser-driven plasma source with a highly efficient array of microcalorimeter x-ray detectors, we are able to observe photoinduced spin changes in an archetypal polypyridyl iron complex ½Feð2; 20 -bipyridineÞ3 2þ and accurately measure the lifetime of the quintet spin state. Our results demonstrate that ultrafast hard x-ray emission spectroscopy is no longer confined to large facilities and now can be performed in conventional laboratories with 10 times better time resolution than at synchrotrons. Our results are enabled, in part, by a 100- to 1000-fold increase in x-ray collection efficiency compared to current techniques
Israel, Latin America and the United States: A Peripheral-Realist Perspective
This document is the paper-format version of the keynote address delivered by its author on August 2, 2009, to the opening session of the Latin American section (AMILAT) of the 15th World Congress of Jewish Studies, at the Hebrew University of Jerusalem. It attempts to understand the long-term shift towards the worse of Israeli-Latin American relations, which started with an almost unqualified support for the establishment of the State of Israel on the side of both Latin American right-wing governments and left-wing parties and popular organizations, but have been deteriorating ever since. It suggests that this involution can be largely explained in terms of at least four intervening variables: Israel's vulnerability, its special relationship with the United States after 1967, Latin American social structure, and the class identity of the leadership of the Latin American Jewry. It argues that overlooking the peripheral character of Israel in the interstate system has led to distortions in the understanding of Israeli-Latin American relations
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