4,584 research outputs found

    Chiral Symmetry Breaking in a Soft-Wall Model of AdS/QCD

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    We incorporate chiral symmetry breaking in a soft-wall version of the AdS/QCD model by using a modified dilaton profile and a quartic term in the bulk scalar potential. This allows one to separate the dependence on spontaneous and explicit chiral symmetry breaking. The resulting mass spectra in the scalar, vector and axial-vector sectors compares favorably with the respective QCD resonances.Comment: Proceedings of "Crossing the Boundaries: Gauge Dynamics at Strong Coupling", Minneapolis, 2009. 12 pages, 7 figure

    Borderplex Economic Outlook: 2006 – 2008

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    A variety of measures such as real output, retail receipts, and personal incomes show how the borderplex economy continues to expand (Table 1). Although employment growth is expected to subside, local labor market strength will be sufficiently robust to hold the El Paso unemployment rate well below its 32-year average of greater than 10 percent. Similarly, even though residential construction activity is expected to moderate slightly, overall housing activity is projected to remain high by historical standards. Expansion at Fort Bliss is the source for much of the heightened business activity as the arrivals of new troops translate into greater demand for housing, retail, and other services. By 2008, more than 13 thousand businesses are expected to be registered in El Paso. Per capita personal income is projected to exceed $26,200 that year. Additional detail obtained from simulations of the UTEP Borderplex Econometric Forecasting Model is presented below for El Paso, Ciudad Juarez, Chihuahua City, and Las Cruces.U.S. - Mexico Border Region; Econometric Forecasts

    El Paso Housing Sector Econometric Forecast Accuracy

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    There is comparatively little empirical evidence regarding the accuracy of regional housing sector forecasts. Much of the recent analysis conducted for this topic is developed for housing starts and indicates a relatively poor track record. This study examines residential real estate forecasts previously published for El Paso, TX using a structural econometric model. Model coverage is much broader than just starts. Similar to earlier studies, the previously published econometric predictions frequently do not fare very well against the selected random walk benchmarks utilized for the various series under consideration.applied econometrics, metropolitan housing sector forecasts, Agribusiness, Community/Rural/Urban Development, Political Economy, C53, R15, R31,

    The Dynamics and Thermodynamics of Soft-Wall AdS/QCD

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    Gauge/Gravity dualities open the non-perturbative realms of strongly-coupled gauge theories to analytic treatment. Anti-de Sitter Space/Conformal Field The- ory, one way of connecting gravity dual models to gauge theories, is a correspon- dence between a ten-dimensional Type IIB superstring theory in AdS5 \times S 5 and a N = 4 super Yang Mills theory. To describe systems that are experimentally ac- cessible, however, the formal correspondence is modified into a phenomenological duality between a five-dimensional gravity model and a strongly coupled QCD-like gauge theory. This duality is referred to as AdS/QCD. This work explores aspects of the soft-wall AdS/QCD model. The phrase 'soft wall' refers to the means of breaking the conformal symmetry and introducing a mass scale to the gauge side of the duality. We add higher-order terms to the soft-wall Lagrangian and calculate the effect on physical observables. Meson mass spectra gain a more complex structure, exhibiting a better match with the experimental values than previous models. The Gell-Mann-Oakes-Renner rela- tion naturally emerges from the model. We calculate the form factor F{\pi} and the coupling g{\rho}{\pi}{\pi} as a non-trivial test on the limits of our soft-wall model. Introducing a black brane into the gravity dual metric allows us to derive thermodynamic quantities in the gauge theory. As expected at high temperatures, the entropy scales as the cube of the temperature, and the speed of sound reaches its conformal limit of one-third. Thermal condensates contribute leading-order terms, modifying the temperature, entropy, and free energy behavior. We find that the system undergoes a phase transition from hadronic matter to a strongly coupled quark-gluon plasma at a critical temperature.Comment: PhD Thesi

    Borderplex Long-Term Economic Trends to 2026

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    Long-term prospects for the El Paso - Ciudad Juárez borderplex economy call for steady growth. On the north side of the border, the population of El Paso is projected to reach 965 thousand by 2026, the last year of the forecast period. Real gross metropolitan product, the broadest measure of local economic activity, is expected to increase by more than 85 percent over the course of the next two decades to more than 31.5billion(1996dollars).Betterjobmarketconditionscombinewithincomegrowthtopushtotalretailsalesabove31.5 billion (1996 dollars). Better job market conditions combine with income growth to push total retail sales above 20.7 billion by the end of the simulation period. Given this projected state of affairs, the UTEP Borderplex Econometric Model forecasts housing starts to average more than 5 thousand units per year through 2026. Substantially higher single-family home prices result under these circumstances. Demographic expansion and business growth jointly lead to greater demand for water in El Paso. As shown in Table 1, total consumption will approximate 45.8 billion gallons per year by the end of the forecast period.Border Economies; Econometric Forecasting Analysis

    Infrastructure Tolls in Texas: Evidence from the Borderplex

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    Do changes in toll rates affect pedestrian, car, and truck traffic across the bridges between El Paso and Ciudad Juarez, Mexico? As more and more attention is paid to the use of tolls as funding mechanisms for new road and infrastructure construction in Texas, the answer to this question has policy implications not only for local and state lawmakers, but also for firms importing and exporting goods between Texas and Mexico. This article uses bridge traffic data from the Borderplex to examine the relative impact of tolls and concludes that local policymakers have more leeway than they thought in raising funds to make infrastructure improvements.Tolls; International Bridges; Border Economics
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