45,403 research outputs found
Soft masses in superstring models with anomalous U(1) symmetries
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
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
We compute conformal anomalies for conformal field theories with free
conformal scalars and massless spin fields in hyperbolic space
and in the ball , for . These
spaces are related by a conformal transformation. In even dimensional spaces,
the conformal anomalies on and are shown to
be identical. In odd dimensional spaces, the conformal anomaly on
comes from a boundary contribution, which exactly coincides
with that of provided one identifies the UV short-distance
cutoff on with the inverse large distance IR cutoff on
, 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 and .Comment: 16 pages. V3: small correction
Operator Mixing in Large Superconformal Field Theories on and Correlators with Wilson loops
We find a general formula for the operator mixing on the of
chiral primary operators (CPO) for the theory at large 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 superconformal field theories in
perturbation theory in terms of correlators of the theory.Comment: 15 pages, no figure
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