Dirichlet boundary conditions in a noncommutative theory

We study the problem of imposing Dirichlet-like boundary conditions along a static spatial curve, in a planar Noncommutative Quantum Field Theory model. After constructing interaction terms that impose the boundary conditions, we discuss their implementation at the level of an interacting theory, with a focus on their physical consequences, and the symmetries they preserve. We also derive the effect they have on certain observables, like the Casimir energies.Comment: 19 pages, 1 figure, pdflate

Boundary Conditions and Unitarity: the Maxwell-Chern-Simons System in AdS_3/CFT_2

We consider the holography of the Abelian Maxwell-Chern-Simons (MCS) system in Lorentzian three-dimensional asymptotically-AdS spacetimes, and discuss a broad class of boundary conditions consistent with conservation of the symplectic structure. As is well-known, the MCS theory contains a massive sector dual to a vector operator in the boundary theory, and a topological sector consisting of flat connections dual to U(1) chiral currents; the boundary conditions we examine include double-trace deformations in these two sectors, as well as a class of boundary conditions that mix the vector operators with the chiral currents. We carefully study the symplectic product of bulk modes and show that almost all such boundary conditions induce instabilities and/or ghost excitations, consistent with violations of unitarity bounds in the dual theory.Comment: 50+1 pages, 6 figures, PDFLaTeX; v2: added references, corrected typo

DETERMINANT OF TWISTED CHIRAL DIRAC OPERATOR ON THE LATTICE

IC/95/66 Using the overlap formulation, we calculate the fermionic determinant on the lattice for chiral fermions with twisted boundary conditions in two dimensions. When the lat-tice spacing tends to zero we recover the results of the usual string-theory continuum calculations. MIRAMARE- TRIEST

Co-parenting Mediates the Influence of Marital Satisfaction on Child Adjustment: The Conditional Indirect Effect by Parental Empathy

This study investigated the mediational role of co-parenting in the association between marital satisfaction and child adjustment, by exploring the conditional indirect effect by parental empathy. Using a sample of 101 Italian father-mother dyads with school-aged children, we administered to parents a series of measures in order to assess marital satisfaction, co-parenting, parents\u2019 empathic skills and children\u2019s adjustment. We computed conditional indirect analyses in order to analyze the mediational role of co-parenting in the associations between marital satisfaction and child adjustment. Consequently, we computed a moderated mediated model in order to explore if mothers\u2019 and fathers\u2019 empathic skills moderated the mediating role of co-parenting. Our findings showed that lower levels of co-parenting mediated the associations between mothers and fathers marital dissatisfaction and children\u2019s behavioral problems. Results also showed that this effect was moderated by parent\u2019s empathic skills, such that mediation is stronger for those with lower empathic competencies (moderated mediation)

Parental Depressive Symptoms and Adolescent Adjustment: A Prospective Test of an Explanatory Model for the Role of Marital Conflict

Despite calls for process-oriented models for child maladjustment due to heightened marital conflict in the context of parental depressive symptoms, few longitudinal tests of the mechanisms underlying these relations have been conducted. Addressing this gap, the present study examined multiple factors longitudinally that link parental depressive symptoms to adolescent adjustment problems, building on a conceptual model informed by emotional security theory (EST). Participants were 320 families (158 boys, 162 girls), including mothers and fathers, who took part when their children were in kindergarten (T1), second (T2), seventh (T3), eighth (T4) and ninth (T5) grades. Parental depressive symptoms (T1) were related to changes in adolescents’ externalizing and internalizing symptoms (T5), as mediated by parents’ negative emotional expressiveness (T2), marital conflict (T3), and emotional insecurity (T4). Evidence was thus advanced for emotional insecurity as an explanatory process in the context of parental depressive symptoms