4,448 research outputs found

    Bright branes for strongly coupled plasmas

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    We use holographic techniques to study photon production in a class of finite temperature, strongly coupled, large-Nc SU(Nc) quark-gluon plasmas with Nf << Nc quark flavours. Our results are valid to leading order in the electromagnetic coupling constant but non-perturbatively in the SU(Nc) interactions. The spectral function of electromagnetic currents and other related observables exhibit an interesting structure as a function of the photon frequency and the quark mass. We discuss possible implications for heavy ion collision experiments.Comment: 29 pages, 14 figure

    Juvenile Justice in Florida: What Kind of Future?

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    The National Council on Crime and Delinquency conducted a study to determine the potential benefits to Florida of adopting a data-driven approach to juvenile corrections that is based on the best national research. This study seeks to complement the ongoing work of the Florida Office of Program Policy and Government accountability (OPPAGA). In this study, NCCD has assessed the potential impact of alternative program and policy options, and provided recommendations that move toward a model continuum of graduated sanctions

    Reforming Juvenile Detention in Florida

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    The National Council on Crime and Delinquency was sponsored by the Jessie Ball duPont Fund to independently study and assess the quality of care in juvenile detention facilities in Florida and how effectively resources are being used. This study is a fair assessment of the conditions of confinement, needs of youth entering the system, and services received as reported by youth and staff

    Thermal photon production in a strongly coupled anisotropic plasma

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    Photons produced in heavy ion collisions escape virtually unperturbed from the surrounding medium, thus representing an excellent probe of the conditions at the emission point. Using the gauge/gravity duality, we calculate the rate of photon production in an anisotropic, strongly coupled N=4 plasma with Nf<<Nc quark flavors. We consider arbitrary orientations of the photon momentum with respect to the anisotropic direction, as well as arbitrary values of the anisotropy. We present results for the correlation functions of two electromagnetic currents and for the electric conductivity. These quantities can be larger or smaller than the isotropic ones, depending on the direction of propagation and polarization of the photons. The total production rate is however always larger than the isotropic one, independently of the frequency, direction of propagation, and value of the anisotropy.Comment: 27 pages, 13 figures; v2: minor changes, added reference

    Executive Summary: Reforming Juvenile Detention in Florida

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    The National Council on Crime and Delinquency was sponsored by the Jessie Ball duPont Fund to independently study and assess the quality of care in juvenile detention facilities in Florida and how effectively resources are being used. This summary provides major findings from the study and recommendations based on these findings

    The National Council on Crime and Delinquency's Evaluation of the Project Development of National Institute of Corrections/Child Welfare League of America's Planning and Intervention Sites Funded to Address the Needs of Children of Incarcerated Parents

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    The National Council on Crime and Delinquency (NCCD) was contracted by the Child Welfare League of America (CWLA) to conduct a process and outcome evaluation of program development for demonstration sites funded by the National Institute of Corrections (NIC). The grantees were to develop projects that would address the needs of children of incarcerated parents. There were ten demonstration sites, four of which received 18 month planning grants, and six of which received three year grants toimplement their intervention programs. The goal of the evaluation was to gain a better understanding of the processes involved in developing and implementing programs that address the needs of children of incarcerated parents

    Hadron production in electron-positron annihilation computed from the gauge gravity correspondence

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    We provide a non-perturbative expression for the hadron production in electron-positron annihilation at zero temperature in a strongly coupled, large-Nc SU(Nc) field theory with Nf << Nc quark flavors. The resulting expressions are valid to leading order in the electromagnetic coupling constant but non-perturbatively in the SU(Nc) interactions and the mass of the quark. We obtain this quantity by computing the imaginary part of the hadronic vacuum polarization function Pi_q using holographic techniques, providing an alternative to the known method that uses the spectrum of infinitely stable mesons determined by the normalizable modes of the appropriated fields in the bulk. Our result exhibits a structure of poles localized at specific real values of q^2, which coincide with the ones found using the normalizable modes, and extends it offering the unique analytic continuation of this distribution to a function defined for values of q^2 over the complex plane. This analytic continuation permits to include a finite decay width for the mesons. By comparison with experimental data we find qualitatively good agreement on the shape of the first pole, when using the rho meson parameters and choosing a proper normalization factor. We then estimate the contribution to the anomalous magnetic moment of the muon finding an agreement within 25%, for this choice of parameters.Comment: 7 pages, 1 figure. Extended version with minor changes in emphasis and references adde

    Bridging Community, Research, and Action: An Emerging Center on Latino Youth Development (FOCUS)

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    This NCCD FOCUS is an update on the community conversations held across California with Latino community stakeholders on the status of Latino youth and the creation of a Center on Latino Youth Development
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