44,235 research outputs found

    Soft masses in superstring models with anomalous U(1) symmetries

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    We analyze the general structure of soft scalar masses emerging in superstring models involving anomalous U(1) symmetries, with the aim of characterizing more systematically the circumstances under which they can happen to be flavor universal. We consider both heterotic orbifold and intersecting brane models, possibly with several anomalous and non-anomalous spontaneously broken U(1) symmetries. The hidden sector is assumed to consist of the universal dilaton, Kahler class and complex structure moduli, which are supposed to break supersymmetry, and a minimal set of Higgs fields which compensate the Fayet-Iliopoulos terms. We leave the superpotential that is supposed to stabilize the hidden sector fields unspecified, but we carefully take into account the relations implied by gauge invariance and the constraints required for the existence of a metastable vacuum with vanishing cosmological constant. The results are parametrized in terms of a constrained Goldstino direction, suitably defined effective modular weights, and the U(1) charges and shifts. We show that the effect induced by vector multiplets strongly depends on the functional form of the Kahler potential for the Higgs fields. We find in particular that whenever these are charged matter fields, like in heterotic models, the effect is non-trivial, whereas when they are shifting moduli fields, like in certain intersecting brane models, the effect may vanish.Comment: 35 pages, LaTe

    Mindfulness-based interventions for anxiety and depression

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    Published in final edited form as: Psychiatr Clin North Am. 2017 December ; 40(4): 739–749. doi:10.1016/j.psc.2017.08.008.This article reviews the ways in which mindfulness practices have contributed to cognitive and behavioral treatments for depression and anxiety. Research on mindfulness-based interventions (MBIs) has increased rapidly in the past decade. The most common include mindfulness-based stress reduction and mindfulness-based cognitive therapy. MBIs are effective in reducing anxiety and depression symptom severity in a range of individuals. MBIs consistently outperform non-evidence-based treatments and active control conditions, such as health education, relaxation training, and supportive psychotherapy. MBIs also perform comparably with cognitive behavior therapy (CBT). The treatment principles of MBIs for anxiety and depression are compatible with standard CBT.R01 AT007257 - NCCIH NIH HH

    Boundary Conformal Anomalies on Hyperbolic Spaces and Euclidean Balls

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    We compute conformal anomalies for conformal field theories with free conformal scalars and massless spin 1/21/2 fields in hyperbolic space Hd\mathbb{H}^d and in the ball Bd\mathbb{B}^d, for 2≤d≤72\leq d\leq 7. These spaces are related by a conformal transformation. In even dimensional spaces, the conformal anomalies on H2n\mathbb{H}^{2n} and B2n\mathbb{B}^{2n} are shown to be identical. In odd dimensional spaces, the conformal anomaly on B2n+1\mathbb{B}^{2n+1} comes from a boundary contribution, which exactly coincides with that of H2n+1\mathbb{H}^{2n+1} provided one identifies the UV short-distance cutoff on B2n+1\mathbb{B}^{2n+1} with the inverse large distance IR cutoff on H2n+1\mathbb{H}^{2n+1}, just as prescribed by the conformal map. As an application, we determine, for the first time, the conformal anomaly coefficients multiplying the Euler characteristic of the boundary for scalars and half-spin fields with various boundary conditions in d=5d=5 and d=7d=7.Comment: 16 pages. V3: small correction

    Operator Mixing in Large NN Superconformal Field Theories on S4\mathbb{S}^4 and Correlators with Wilson loops

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    We find a general formula for the operator mixing on the S4\mathbb{S}^4 of chiral primary operators (CPO) for the N=4{\cal N}=4 theory at large NN in terms of Chebyshev polynomials. As an application, we compute the correlator of a CPO and a Wilson loop, reproducing an earlier result by Giombi and Pestun obtained from a two-matrix model proposal. Finally, we discuss a simple method to obtain correlators in general N=2{\cal N}=2 superconformal field theories in perturbation theory in terms of correlators of the N=4{\cal N}=4 theory.Comment: 15 pages, no figure
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