2,160 research outputs found
Chern-Simons Actions and Their Gaugings in 4D, N=1 Superspace
We gauge the abelian hierarchy of tensor fields in 4D by a Lie algebra. The
resulting non-abelian tensor hierarchy can be interpreted via an equivariant
chain complex. We lift this structure to N=1 superspace by constructing
superfield analogs for the tensor fields, along with covariant superfield
strengths. Next we construct Chern-Simons actions, for both the bosonic and N=1
cases, and note that the condition of gauge invariance can be presented
cohomologically. Finally, we provide an explicit realization of these
structures by dimensional reduction, for example by reducing the three-form of
eleven-dimensional supergravity into a superspace with manifest 4D, N=1
supersymmetry.Comment: 40pp, v2 added reference
Abelian Tensor Hierarchy in 4D, N=1 Superspace
With the goal of constructing the supersymmetric action for all fields,
massless and massive, obtained by Kaluza-Klein compactification from type II
theory or M-theory in a closed form, we embed the (Abelian) tensor hierarchy of
p-forms in four-dimensional, N=1 superspace and construct its Chern-Simons-like
invariants. When specialized to the case in which the tensors arise from a
higher-dimensional theory, the invariants may be interpreted as
higher-dimensional Chern-Simons forms reduced to four dimensions. As an
application of the formalism, we construct the eleven-dimensional Chern-Simons
form in terms of four-dimensional, N=1 superfields.Comment: 31 page
N=1 Supercurrents of Eleven-dimensional Supergravity
Eleven-dimensional supergravity can be formulated in superspaces locally of
the form where is 4D conformal superspace
and is an arbitrary 7-manifold admitting a -structure. The
eleven-dimensional 3-form and the stable 3-form on define the lowest
component of a gauge superfield on that is chiral as a
superfield on . This chiral field is part of a tensor hierarchy
giving rise to a superspace Chern-Simons action and its real field strength
defines a lifting of the Hitchin functional on to the superspace
. These terms are those of lowest order in a superspace
Noether expansion in seven conformal gravitino superfields . In
this paper, we compute the action to all orders in the remaining
fields. The eleven-dimensional origin of the resulting non-linear structures is
parameterized by the choice of a complex spinor on encoding the off-shell
4D subalgebra of the eleven-dimensional super-Poincare algebra
Components of Eleven-dimensional Supergravity with Four Off-shell Supersymmetries
We derive the component structure of 11D, supergravity linearized
around eleven-dimensional Minkowski space. This theory represents 4 local
supersymmetries closing onto 4 of the 11 spacetime translations without the use
of equations of motion. It may be interpreted as adding auxiliary bosons
and auxiliary fermions to the physical supergravity multiplet for a total
of components. These components and their transformations are
organized into representations of .Comment: v3: References added, modified footnote. Published versio
M-theory on Spin(7) Manifolds, Fluxes and 3D, N=1 Supergravity
We calculate the most general causal N=1 three-dimensional, gauge invariant
action coupled to matter in superspace and derive its component form using
Ectoplasmic integration theory. One example of such an action can be obtained
by compactifying M-theory on a Spin(7) holonomy manifold taking non-vanishing
fluxes into account. We show that the resulting three-dimensional theory is in
agreement with the more general construction. The scalar potential resulting
from Kaluza-Klein compactification stabilizes all the moduli fields describing
deformations of the metric except for the radial modulus. This potential can be
written in terms of the superpotential previously discussed in the literature.Comment: 37 pages no figures (LaTeX 2e
Hispanic Familism Reconsidered
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/93710/1/tsq1252.pd
Handling qualities of a wide-body transport airplane utilizing Pitch Active Control Systems (PACS) for relaxed static stability application
Piloted simulation studies have been conducted to evaluate the effectiveness of two pitch active control systems (PACS) on the flying qualities of a wide-body transport airplane when operating at negative static margins. These two pitch active control systems consisted of a simple 'near-term' PACS and a more complex 'advanced' PACS. Eight different flight conditions, representing the entire flight envelope, were evaluated with emphasis on the cruise flight conditions. These studies were made utilizing the Langley Visual/Motion Simulator (VMS) which has six degrees of freedom. The simulation tests indicated that (1) the flying qualities of the baseline aircraft (PACS off) for the cruise and other high-speed flight conditions were unacceptable at center-of-gravity positions aft of the neutral static stability point; (2) within the linear static stability flight envelope, the near-term PACS provided acceptable flying qualities for static stabilty margins to -3 percent; and (3) with the advanced PACS operative, the flying qualities were demonstrated to be good (satisfactory to very acceptable) for static stabilty margins to -20 percent
Initial Development of a Patient-Reported Instrument Assessing Harm, Efficacy, and Misuse of Long-Term Opioid Therapy
Guidelines on long-term opioid therapy recommend frequent reassessment of harm, efficacy, and misuse of these potentially harmful and sometimes ineffective medications. In primary care, there is a need for a brief, patient-reported instrument. This report details the initial steps in the development of such an instrument. An interdisciplinary team of clinician-scientists performed four discrete steps in this study: (1) conceptualization of the purpose and function of the instrument, (2) assembly of an item pool, (3) expert rating on which items were most important to include in the instrument, and (4) modification of expert-selected items based on a reading level check and cognitive interviews with patients. A diverse panel of 47 subject matter experts was presented with 69 items to rate on a 1–9 scale in terms of importance for inclusion in the instrument. The panel highly rated 37 items: 8 related to harm, 4 related to efficacy, and 25 related to misuse. These 37 items were then tested for patient comprehension and modified as needed. Next steps in development will include further item reduction, testing against a gold standard, and assessment of the instrument’s effect on clinical outcomes
Pre- and Post Impoundment Ichthyoparasite Succession in a New Arkansas Reservoir
Helminth and crustacean parasites from 2,387 Micropterus dolomieui, M. punctulatus, and M. salmoides were utilized to monitor annual pre- and postimpoundment succession patterns spanning eight con- tinuous years in Beaver Reservoir, Arkansas. Incidence of infection by ichthyoparasites with direct life cycles (monogenetic trematodes, leeches, and crustaceans) generally increased following impoundment, although leeches remained relatively constant. Exceptions to this general pattern occurred. Incidence of ichthyoparasites with indirect life cycles (digenetic trematodes, cestodes, acanthocephalans, and nematodes) decreased immediately following impoundment with subsequent increases to a point equal or above that of preimpoundment, although exceptions occurred. Time for species adaptation to the reservoir environment varied, with some species disappearing and others occurring for the first time. Diversity indices indicated that a moderate parasite community was maintained in the White River two years prior to its impoundment to form Beaver Reservoir. During the first impoundment year the parasite community declined to the lowest postimpoundment level with the abrupt change in habitat. Throughout the following four post- impoundment years the parasite community gradually increased to become much larger and more complex than it was during preimpoundment. Parasite community succession stabilization occurred in the fifth postimpoundment year and continued the following year indicating the establishment of a climax ichthyoparasite community
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