479 research outputs found
Moduli Stabilization and the Holographic RG for AdS and dS
We relate moduli stabilization () in the bulk of or to
basic properties of the Wilsonian effective action in the holographic dual
theory on : the single-trace terms in the action have vanishing beta
functions, and higher-trace couplings are determined purely from lower-trace
ones. In the de Sitter case, this encodes the maximal symmetry of the bulk
spacetime in a quantity which is accessible within an observer patch. Along the
way, we clarify the role of counterterms, constraints, and operator redundancy
in the Wilsonian holographic RG prescription, reproducing the expected behavior
of the trace of the stress-energy tensor in the dual for both and
. We further show that metastability of the gravity-side potential energy
corresponds to a nonperturbatively small imaginary contribution to the
Wilsonian action of pure de Sitter, a result consistent with the need for
additional degrees of freedom in the holographic description of its ultimate
decay.Comment: 28 pages; v2: minor modifications, published version in JHE
Supporting Young Children With Multiple Disabilities: What Do We Know and What Do We Still Need To Learn?
Young children with multiple disabilities have unique needs and challenges. Many of these young children struggle to communicate their wants and needs, to freely move their body to access and engage their world, and to learn abstract concepts and ideas. Professionals and families working together must identify the individual supports each child needs to ensure that the young child with multiple disabilities is an active participant in all aspects of their lives and makes meaningful progress toward valued life outcomes
Anthropometry of craniosynostosis
Background
Anthropometry is becoming a popular method for diagnostics of various diseases in pediatric clinical practice. The aim of this study was to assess the growth changes in craniofacial parameters in patients with craniosynostosis and positional plagiocephaly.
Methods
Inclusion criteria for the study were presence of craniostenosis or positional plagiocephaly in a patient with at least three anthropometric evaluations at our department. Studied patients were aged from 1.0 month to 2.5 years with median age at the first and last anthropometric evaluation as 1.83 and 25.27 months, respectively. Further anthropometric results in patients older than 2.5 years were excluded from the study. Statistical significance was tested by the Mann–Whitney test.
Results
The studied group consisted of 70.5% male patients. The type of craniosynostosis was represented by scaphocephaly in 44.1%, by trigonocephaly in 45.6% and by coronal craniosynostosis in 10.3% of the cases. Cranial index was proven as a suitable parameter for evaluating differences in the trend of growth in craniosynostosis (p<0.001) and also for evaluating post-operative results. Significance was found in width of the head (p=0.038) for scaphocephaly and in length of the head for trigonocephaly (p=0.001) in surgically treated patients. Trend of cranial growth in operated patients copied the curve of the norm but in higher or lower values which depends on the type of prematurely closed suture.
Conclusion
Longitudinal anthropometric follow-up is an objective and measurable method that can accurately non-invasively and non-expensively assess skull growth in pediatric patients with cranial deformity
A Qualitative Study of the Initiation and Continuation of Preschool Inclusion Programs
This is the publisher's version, also found here: http://cec.metapress.com/content/h13780v85427/?p=7691ebee5d054406b7e2d78120f572db&pi=25Initiation and continuation of preschool inclusion is a challenging task. Through interviews and focus groups of school district and special education personnel, researchers in this study examined how 5 programs in 1 Midwestern state provided such services. The investigation used a multiple-case study methodology to examine how these programs initiated and sustained inclusive services. Especially important to these programs were factors such as having a shared vision, utilizing key personnel, and developing a structure within which the program could work. [ABSTRACT FROM AUTHOR
Unitarity bounds and RG flows in time dependent quantum field theory
We generalize unitarity bounds on operator dimensions in conformal field
theory to field theories with spacetime dependent couplings. Below the energy
scale of spacetime variation of the couplings, their evolution can strongly
affect the physics, effectively shifting the infrared operator scaling and
unitarity bounds determined from correlation functions in the theory. We
analyze this explicitly for large- double-trace flows, and connect these to
UV complete field theories. One motivating class of examples comes from our
previous work on FRW holography, where this effect explains the range of
flavors allowed in the dual, time dependent, field theory.Comment: 38 page
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