Torsional Newton Cartan gravity from non-relativistic strings

We study propagation of closed bosonic strings in torsional Newton-Cartan geometry based on a recently proposed Polyakov type action derived by dimensional reduction of the ordinary bosonic string along a null direction. We generalize the Polyakov action proposal to include matter, i.e. the 2-form and the 1-form that originates from the Kalb-Ramond field and the dilaton. We determine the conditions for Weyl invariance which we express as the beta-function equations on the worldsheet, in analogy with the usual case of strings propagating on a pseudo-Riemannian manifold. The critical dimension of the TNC space-time turns out to be 25. We find that Newton's law of gravitation follows from the requirement of quantum Weyl invariance in the absence of torsion. Presence of the 1-form requires torsion to be non vanishing. Torsion has interesting consequences, in particular it yields a mass term and an advection term in the generalized Newton's law. U(1) mass invariance of the theory is an important ingredient in deriving the beta functions.Comment: Summary of results added. Reorganization and generalization of results. Typos fixe

Non-Riemannian gravity actions from double field theory

Non-Riemannian gravitational theories suggest alternative avenues to understand properties of quantum gravity and provide a concrete setting to study condensed matter systems with non-relativistic symmetry. Derivation of an action principle for these theories generally proved challenging for various reasons. In this technical note, we employ the formulation of double field theory to construct actions for a variety of such theories. This formulation helps removing ambiguities in the corresponding equations of motion. In particular, we embed Torsional Newton-Cartan gravity, Carrollian gravity and String Newton-Cartan gravity in double field theory, derive their actions and compare with the previously obtained results in literature

Systemic Design for Food Self-Sufficiency in Urban Areas

This article adopts a systemic approach to address the problem of the operationalization of relationships between actors conducive to food self-sufficiency in urban areas. Through the use of Social Network Analysis (SNA), the literature on urban agriculture was analyzed, detecting eight key trends and topic areas. This information was used to design a generic recursive organizational structure with the identification of the key roles and functions for management and governance in the multi-level and multi-stakeholder relationships of a sustainable urban self-sufficient food production system, inspired by the principles of complexity management and organizational cybernetics. Methodologically, this is the first application that combines the exploratory capability of SNA and the recursive structure of the Viable System Model (VSM) to propose applicable organizational structures in any urban area, suggesting a new route for the study and application of systemic thinking in the development of urban agriculture schemes. However, due to the conceptual nature of this work, this study opens a discussion on how we can rethink interactions to seek continuous adaptation in food self-sufficiency, provide tools that foster inclusion, and adapt to every context to support the relevant actors and academics in urban agriculture.</jats:p

Fortalezas del carácter, características sociodemográficas y satisfacción con la vida en estudiantes mexicanos

The main purpose of this study was to identify the existing relationship between character strengths and life satisfaction, as well as some sociodemographic aspects related to gender differences. Both the Virtue and Strength Inventory (IVYF; Cosentino &amp; Castro, 2008) and the Satisfaction with Life Scale (SWLS; Diener, Emmons, Larsen &amp; Griffin, 1985) were administered to 343 undergraduate students whose primary major of study pertained to health professions. Results indicated that for women, love and gratitude are the strengths that explained 21.3 % of the variance regarding satisfaction with life, while love and social intelligence predicted 44.5 % of life satisfaction for men. Results are discussed under the light of cultural differences

Goal orientations, satisfaction, beliefs in sport success and motivational climate in swimmers.

En el presente estudio se plantearon varios objetivos; comprobar las relaciones existentes entre las orientaciones de meta, la satisfacción, las creencias sobre las causas del éxito en el deporte y el clima motivacional percibido en nadadores; examinar el efecto que tiene la orientación de meta en las diferentes dimensiones analizadas; y, por último, predecir la orientación de meta. La muestra estuvo compuesta por 163 nadadores. Los instrumentos utilizados fueron las versiones validadas al castellano del TEOSQ, SSI, BACSSQ y PMCSQ-2. Se realizaron tres tipos de análisis estadísticos: análisis de correlaciones bivariadas, análisis multivariante (MANOVA 2x2) y análisis de regresión lineal múltiple multivariado por pasos. Los resultados mostraron que la capacidad y el aburrimiento son variables predictoras de la orientación de meta hacia el ego, mientras que el esfuerzo y la diversión lo son de las orientaciones de meta hacia la tareaThe present study had several objectives; to check the relationships between goal orientations, satisfaction, beliefs about the causes of success in sport and motivational climate perceived in swimmers; to examine the effect of goal orientation in different dimensions analyzed, and finally to predict goal orientation. The sample consisted of 163 swimmers. The instruments used were validated to Castilian versions of TEOSQ, SSI, BACSSQ and PMCSQ-2. There were three types of statistical analyzes: bivariate correlation analysis, multivariate analysis (MANOVA 2x2) and multiple linear regression analysis stepwise multivariate. The results showed that capacity and boredom are predictors of goal orientation towards the ego, while effort and fun are the goal orientations to the tas

Dynamics of a ring of three unidirectionally coupled Duffing oscillators with time-dependent damping

We study dynamics of a ring of three unidirectionally coupled double-well Duffing oscillators for three different values of the damping coefficient: fixed dumping, proportional to time, and inversely proportional to time. The dynamics in all cases is analyzed through time series, Fourier and Hilbert transforms, Poincar\'e sections, as well as bifurcation diagrams and Lyapunov exponents with respect to the coupling strength. In the first case, we observe a well-known route from a stable steady state to hyperchaos through Hopf bifurcation and a series of torus bifurcations, as the coupling strength is increased. In the second case, the system is highly dissipative and converges into one of stable equilibria. Finally, in the third case, transient toroidal hyperchaos takes place

Prevalence of Sexual Harassment Toward and Burnout Among Allied Healthcare Professionals

Purpose: Burnout is a psychological cognitive-affective syndrome that is defined by emotional exhaustion, depersonalization, and reduced accomplishment. Burnout has been identified as a common issue in several allied healthcare professions, and is often contributed to by stress, workload, and social support. At the time of this study, there appears to be no published research on the relationship between levels of sexual harassment and levels of burnout. The purpose of this was to describe the prevalence of burnout and sexual harassment among allied healthcare professionals and students. A secondary purpose was to examine the potential relationship between sexual harassment and burnout among allied healthcare professionals and students. Methods: A total of 173 allied healthcare professionals and students (age= 43 ± 13, years of certified experience = 17 ± 12) opened and completed the instrument. Participants were sent an electronic survey via email that collected demographic information and assessed levels of burnout and sexual harassment. Data was downloaded and analyzed using a commercially available statistics package. Results: On average, allied healthcare professionals and students were at risk of burnout. There was a significant positive correlation between levels of burnout and sexual harassment. Additionally, females were significantly more likely to report workplace sexual harassment than males. Conclusions: The findings of this study suggest, on average, allied healthcare professionals and students are at risk of burnout. The findings also suggest that female allied healthcare professionals and students are more likely to experience burnout as a result of workplace sexual harassment. There is an evident need for employers to enhance policies and procedures to reduce and eliminate the occurrence of sexual harassment in the workplace. Doing so has the potential to reduce the risk of burnout among female allied healthcare professionals and students