23,489 research outputs found
Higgs-Radion Mixing with Enhanced Di-Photon Signal
In the context of warped scenarios in which Standard Model (SM) fields are
allowed to propagate in the bulk, we revisit the possible mixing between the IR
localized Higgs field and the Radion graviscalar. The phenomenology of the
resulting mostly-Higgs field does not suffer important deviations with respect
to the case in which all the SM is localized in the IR brane (original
Higgs-Radion mixing scenario). On the contrary, the phenomenology of the
mostly-Radion field can present important differences with respect to the
original scenario. At the LHC, the most striking effect is now the possibility
of sizeable Radion decays into photons in a mass range well beyond the ZZ and
WW thresholds, not due to dramatically enhanced couplings to photons but to
suppressed couplings to massive fields.Comment: 19 pages, 6 figure
Spectral methods for bivariate Markov processes with diffusion and discrete components and a variant of the Wright-Fisher model
The aim of this paper is to study differential and spectral properties of the
infinitesimal operator of two dimensional Markov processes with diffusion and
discrete components. The infinitesimal operator is now a second-order
differential operator with matrix-valued coefficients, from which we can derive
backward and forward equations, a spectral representation of the probability
density, study recurrence of the process and the corresponding invariant
distribution. All these results are applied to an example coming from group
representation theory which can be viewed as a variant of the Wright-Fisher
model involving only mutation effects.Comment: 6 figure
Fostering Critical Thinking about Climate Change: Applying Community Psychology to an Environmental Education Project with Youth
This article argues for the participation of community psychology in issues of global climate change. The knowledge accumulated and experience gained in the discipline of community psychology have great relevance to many topics related to the environment. Practitioners of community psychology could therefore make significant contributions to climate change mitigation. To illustrate this assertion, we describe an education project conducted with youth engaged in a community-based environmental organization. This initiative was motivated by the idea that engaged and critically aware youth often become change agents for social movements. Towards this purpose, rather than using mass marketing strategies to motivate small behavior changes, this project focused intensively on a few youth with the vision that these youth would also influence those around them to rethink their environmental habits. This project was influenced by five community psychology concepts: stakeholder participation, ecological and systems thinking, social justice, praxis, and empirical grounding. In this article we discuss the influence of these concepts on the project’s outcomes, as measured through an evaluative study conducted to assess the impacts of the project on the participating youth in terms of their thinking and action. The contributions of community psychology were found to have greatly impacted the quality of the project and the outcomes experienced by the youth
Shock wave interaction with an abrupt area change
The wave patterns that occur when a shock wave interacts with an abrupt area changed are analyzed in terms of the incident shock wave Mach number and area-jump ratio. The solutions predicted by a semi-similar models are in good agreement with those obtained numerically from the quasi-one-dimensional time-dependent Euler equations. The entropy production for the wave system is defined and the principle of minimum entropy production is used to resolve a nonuniqueness problem of the self-similar model
Some examples of matrix-valued orthogonal functions having a differential and an integral operator as eigenfunctions
The aim of this paper is to show some examples of matrix-valued orthogonal
functions on the real line which are simultaneously eigenfunctions of a
second-order differential operator of Schr\"{o}dinger type and an integral
operator of Fourier type. As a consequence we derive integral representations
of these functions as well as other useful structural formulas. Some of these
functions are plotted to show the relationship with the Hermite or wave
functions
A possible chiral spin-liquid phase in non-centrosymmetric BaCoO
Based on a symmetry approach, we propose a possible explanation of the weak
ferromagnetic component recently observed in YBaCoFeO (Valldor et al.
Phys Rev B, 224426 (2011)) and other isostructural compounds in the
high-temperature spin-liquid phase. Due to the polar nature of their crystal
structure, a coupling between time-odd scalar spin chirality which we suggest
as the primary order parameter and macroscopic magnetization is possible as
follows from the general form of the appropriate free-energy invariant. The
deduced pseudoproper coupling between both physical quantities provides a
unique possibility to study the critical behaviour of the chiral order
parameter
Percepción de la salud de los niños expresada en el lenguaje creativo de los dibujos
Objective. Children’s health perception through creative
drawing language the identification of external factors perceived
as negative or positive to health by children. Methodology. A
descriptive study that describes the analysis of the expressive
language of drawings and written comments. The sample
consisted of 130 children in 3rd and 4th classes from four
randomly selected schools, in the region of Central Portugal
Continental (Coimbra district). The study was conducted during
the first semester of 2011. The data collection was performed
by means of Rodrigues’ drawing/writing sheet. This sheet is
divided in 4 areas (2 of them to draw what children consider
good for health and the other 2 to write the content or message
of the drawings). The themes expressed are classified based
on the priority areas for the promotion of healthy lifestyles.
Results. children value healthy food, physical activity, mental
health, prevention of inappropriate substance consumption and
health and environment. The drawings and comments show
links between diet and physical exercise, and between mental
health and interpersonal relationships. Conclusion. Drawings
and comments facilitate health professionals understanding
of children’s perception of health positive and negative factors.
The results of the study allow planning intervention strategies in
school health from infant perception
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