51,870 research outputs found

    “I Am Undocumented and a New Yorker”: Affirmative City Citizenship and New York City’s IDNYC Program

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    The power to confer legal citizenship status is possessed solely by the federal government. Yet the courts and legal theorists have demonstrated that citizenship encompasses factors beyond legal status, including rights, inclusion, and political participation. As a result, even legal citizens can face barriers to citizenship, broadly understood, due to factors including their race, class, gender, or disability. Given this multidimensionality, the city, as the place where residents carry out the tasks of their daily lives, is a critical space for promoting elements of citizenship. This Note argues that recent city municipal identification-card programs have created a new form of citizenship for their residents. This citizenship, which this Note terms “Affirmative City Citizenship,” is significant for both marginalized populations generally, as well as undocumented immigrant city residents who, because of their noncitizen legal status, face additional hurdles to city life. Utilizing “IDNYC”—New York City’s municipal identification-card program—as a case study, this Note examines the strengths and limitations of Affirmative City Citizenship as a means for supporting undocumented immigrant city residents. It concludes that while Affirmative City Citizenship is a powerful tool for confronting barriers to citizenship, its success with the immigrant population relies in part on the city’s adoption of other proimmigrant policies that more directly conflict with federal law. Accordingly, it recommends that cities seeking to protect their undocumented immigrant city residents adopt both types of policies

    A Grassmann representation of the Hubble parameter

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    The Riccati equation for the Hubble parameter H of barotropic FRW cosmologies in conformal time for \kappa \neq 0 spatial geometries and in comoving time for the \kappa =0 geometry, respectively, is generalized to odd Grassmannian time parameters. We obtain a system of simple differential equations for the four supercomponents (two of even type and two of odd type) of the Hubble superfield function {\cal H} that is explicitly solved. The second even Hubble component does not have an evolution governed by general relativity although there are effects of the latter upon itComment: 4 pages, no figure

    Scaling properties of a ferromagnetic thin film model at the depinning transition

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    In this paper, we perform a detailed study of the scaling properties of a ferromagnetic thin film model. Recently, interest has increased in the scaling properties of the magnetic domain wall (MDW) motion in disordered media when an external driving field is present. We consider a (1+1)-dimensional model, based on evolution rules, able to describe the MDW avalanches. The global interface width of this model shows Family-Vicsek scaling with roughness exponent ζ1.585\zeta\simeq 1.585 and growth exponent β0.975\beta\simeq 0.975. In contrast, this model shows scaling anomalies in the interface local properties characteristic of other systems with depinning transition of the MDW, e.g. quenched Edwards-Wilkinson (QEW) equation and random-field Ising model (RFIM) with driving. We show that, at the depinning transition, the saturated average velocity vsatfθv_\mathrm{sat}\sim f^\theta vanished very slowly (with θ0.037\theta\simeq 0.037) when the reduced force f=p/pc10+f=p/p_\mathrm{c}-1\to 0^{+}. The simulation results show that this model verifies all accepted scaling relations which relate the global exponents and the correlation length (or time) exponents, valid in systems with depinning transition. Using the interface tilting method, we show that the model, close to the depinning transition, exhibits a nonlinearity similar to the one included in the Kardar-Parisi-Zhang (KPZ) equation. The nonlinear coefficient λfϕ\lambda\sim f^{-\phi} with ϕ1.118\phi\simeq -1.118, which implies that λ0\lambda\to 0 as the depinning transition is approached, a similar qualitatively behaviour to the driven RFIM. We conclude this work by discussing the main features of the model and the prospects opened by it.Comment: 10 pages, 5 figures, 1 tabl

    Growing interfaces: A brief review on the tilt method

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    The tilt method applied to models of growing interfaces is a useful tool to characterize the nonlinearities of their associated equation. Growing interfaces with average slope mm, in models and equations belonging to Kardar-Parisi-Zhang (KPZ) universality class, have average saturation velocity Vsat=Υ+12Λm2\mathcal{V}_\mathrm{sat}=\Upsilon+\frac{1}{2}\Lambda\,m^2 when m1|m|\ll 1. This property is sufficient to ensure that there is a nonlinearity type square height-gradient. Usually, the constant Λ\Lambda is considered equal to the nonlinear coefficient λ\lambda of the KPZ equation. In this paper, we show that the mean square height-gradient h2=a+bm2\langle |\nabla h|^2\rangle=a+b \,m^2, where b=1b=1 for the continuous KPZ equation and b1b\neq 1 otherwise, e.g. ballistic deposition (BD) and restricted-solid-on-solid (RSOS) models. In order to find the nonlinear coefficient λ\lambda associated to each system, we establish the relationship Λ=bλ\Lambda=b\,\lambda and we test it through the discrete integration of the KPZ equation. We conclude that height-gradient fluctuations as function of m2m^2 are constant for continuous KPZ equation and increasing or decreasing in other systems, such as BD or RSOS models, respectively.Comment: 11 pages, 4 figure
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