591 research outputs found
Creative thinking ability in nursing students
Thesis (M.S.)--Boston Universit
Complexity and the bulk volume, a new York time story
We study the boundary description of the volume of maximal Cauchy slices
using the recently derived equivalence between bulk and boundary symplectic
forms. The volume of constant mean curvature slices is known to be canonically
conjugate to "York time". We use this to construct the boundary deformation
that is conjugate to the volume in a handful of examples, such as empty AdS, a
backreacting scalar condensate, or the thermofield double at infinite time. We
propose a possible natural boundary interpretation for this deformation and use
it to motivate a concrete version of the complexity=volume conjecture, where
the boundary complexity is defined as the energy of geodesics in the K\"ahler
geometry of half sided sources. We check this conjecture for Ba\~nados
geometries and a mini-superspace version of the thermofield double state.
Finally, we show that the precise dual of the quantum information metric for
marginal scalars is given by a particularly simple symplectic flux, instead of
the volume as previously conjectured.Comment: 43 pages + appendices, 5 figures; v2: typos fixed, small comments
added
Gravitational path integral from the deformation
We study a deformation of large conformal field theories, a higher
dimensional generalization of the deformation. The deformed partition
function satisfies a flow equation of the diffusion type. We solve this
equation by finding its diffusion kernel, which is given by the Euclidean
gravitational path integral in dimensions between two boundaries with
Dirichlet boundary conditions for the metric. This is natural given the
connection between the flow equation and the Wheeler-DeWitt equation, on which
we offer a new perspective by giving a gauge-invariant relation between the
deformed partition function and the radial WDW wave function. An interesting
output of the flow equation is the gravitational path integral measure which is
consistent with a constrained phase space quantization. Finally, we comment on
the relation between the radial wave function and the Hartle-Hawking wave
functions dual to states in the CFT, and propose a way of obtaining the volume
of the maximal slice from the deformation.Comment: 30 pages, 1 figure; v2 references adde
Endothelin-Stimulated Capacitative Calcium Entry in Enteric Glial Cells: Synergistic Effects of Protein Kinase C Activity and Nitric Oxide
Depletion of intracellular calcium stores by agonist stimulation is coupled to calcium influx across the plasma membrane, a process termed capacitative calcium entry. Capacitative calcium entry was examined in cultured guinea pig enteric glial cells exposed to endothelin 3. Endothelin 3 (10 n M ) caused mobilization of intracellular calcium stores followed by influx of extracellular calcium. This capacitative calcium influx was inhibited by Ni 2+ (89 ± 2%) and by La 3+ (78 ± 2%) but was not affected by L-, N-, or P-type calcium channel blockers. Chelerythrine, a specific antagonist of protein kinase C, dose-dependently inhibited capacitative calcium entry. The nitric oxide synthase inhibitor N G -nitro-l-arginine decreased calcium influx in a dose-dependent manner. The combination of chelerythrine and N G -nitro-l-arginine produced synergistic inhibitory effects. Capacitative calcium entry occurs in enteric glial cells via lanthanum-inhibitable channels through a process regulated by protein kinase C and nitric oxide.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65161/1/j.1471-4159.1998.71010205.x.pd
Relationship between negative emotions and perceived support among parents of hospitalized, critically ill children.
Objectives: The purpose of this study was to describe relationships between negative emotions and perceived emotional support in parents of children admitted to the pediatric intensive care unit (PICU).
Methods: This cross-sectional descriptive study conducted face-to-face interviews between January 2019 and January 2020. Study variables included depression (PHQ-9 Scale), anxiety (Emotional Distress-Anxiety-Short Form 8a), anger (Emotional Distress-Anger-Short Form 5a), fear (Fear-Affect Computerized Adaptive Test), somatic fear (Fear-Somatic Arousal-Fixed Form), loneliness (Revised 20-item UCLA Loneliness Scale), and perceived emotional support (Emotional Support-Fixed Form).
Results: Eighty parents reported symptoms of depression 8.00(4.00, 13.75), anxiety (23.43 ± 7.80), anger (13.40 ± 5.46), fear (72.81 ± 27.26), somatic fear 9.00(6.00, 12.75), loneliness (39.35 ± 12.00), and low perceived emotional support (32.14 ± 8.06). Parents who were young, single, low-income, and with limited-post secondary education reported greater loneliness and lower perceived emotional support. Fear correlated with depression (
Conclusions: The cluster of negative emotions identified will serve as potential targets for future interventions designed to enhance support for parents of critically ill children
Endemic mycosis
This article is made available for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemi
Holography and Localization of Information in Quantum Gravity
Within the AdS/CFT correspondence, we identify a class of CFT operators which
represent diff-invariant and approximately local observables in the
gravitational dual. Provided that the bulk state breaks all asymptotic
symmetries, we show that these operators commute to all orders in with
asymptotic charges, thus resolving an apparent tension between locality in
perturbative quantum gravity and the gravitational Gauss law. The
interpretation of these observables is that they are not gravitationally
dressed with respect to the boundary, but instead to features of the state. We
also provide evidence that there are bulk observables whose commutator vanishes
to all orders in with the entire algebra of single-trace operators
defined in a space-like separated time-band. This implies that in a large
holographic CFT, the algebra generated by single-trace operators in a
short-enough time-band has a non-trivial commutant when acting on states which
break the symmetries. It also implies that information deep in the interior of
the bulk is invisible to single-trace correlators in the time-band and hence
that it is possible to localize information in perturbative quantum gravity.Comment: 67 pages + appendices, 6 figure
State-dressed local operators in the AdS/CFT correspondence
We examine aspects of locality in perturbative quantum gravity and how
information can be localized in subregions. In the framework of AdS/CFT, we
consider the algebra of single-trace operators defined in a short time band. We
conjecture that, if the state has large energy variance, then this algebra will
have a commutant in the 1/N expansion. We provide evidence for this by
identifying operators that commute with the conformal field theory Hamiltonian
to all orders in 1/N, thus resolving an apparent tension with the gravitational
Gauss law. The bulk interpretation is that these operators are gravitationally
dressed with respect to features of the state rather than the boundary. We
comment on observables in certain black hole microstates and the gravitational
dressing in the island proposal.Comment: 6 pages; v2 minor changes made, version as published in PR
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