7,258 research outputs found
GeV Analysis of Mixed Morphology Supernova Remnants Interacting with Molecular Clouds
The first remnants detected by the Fermi Gamma-ray Space Telescope were of
the type of mixed-morphology supernova remnants interacting with molecular
clouds. In this paper we are presenting preliminary results of the gamma-ray
analysis of 4 selected mixed morphology remnants, G359.1-0.5, G337.8-0.1,
G001.0-0.1, and G346.6-0.2, as well as G349.7+0.2, in the 0.2 - 300 GeV energy
range from the data collected by Fermi Gamma-ray Space Telescope for 3 years.
G359.1-0.5, G337.8-0.1, and G349.7+0.2 were all detected with significances
above 5 sigma. The excess distribution of G359.1-0.5 shows extended gamma-ray
emission, which coincides with the TeV gamma-ray source HESS J1745-303.
G337.8-0.1 also shows an extended nature.Comment: High Energy Gamma-Ray Astronomy: 5th International Meeting on High
Energy Gamma-Ray Astronom
Rigid 6D supersymmetry and localization
We construct rigid supersymmetric theories for interacting vector and tensor
multiplets on six-dimensional Riemannian spin manifolds. Analyzing the Killing
spinor equations, we derive the constraints on these theories. To this end, we
reformulate the conditions for supersymmetry as a set of necessary and
sufficient conditions on the geometry. The formalism is illustrated with a
number of examples, including manifolds that are hermitian, strong Kaehler with
torsion. As an application, we show that the path integral of pure super
Yang-Mills theory defined on a Calabi-Yau threefold M_6 localizes on stable
holomorphic bundles over M_6.Comment: 31 page
Six-dimensional superconformal couplings of non-abelian tensor and hypermultiplets
We construct six-dimensional superconformal models with non-abelian tensor
and hypermultiplets. They describe the field content of (2,0) theories, coupled
to (1,0) vector multiplets. The latter are part of the non-abelian gauge
structure that also includes non-dynamical three- and four-forms. The
hypermultiplets are described by gauged nonlinear sigma models with a
hyper-Kaehler cone target space. We also address the question of constraints in
these models and show that their resolution requires the inclusion of abelian
factors. These provide couplings that were previously considered for anomaly
cancellations with abelian tensor multiplets and resulted in the selection of
ADE gauge groups.Comment: 25 page
Nonlinear Elastic Material Property Estimation of Lower Extremity Residual Limb Tissues
The interface stresses between the residual limb and prosthetic socket have been studied to investigate prosthetic fit. Finite-element models of the residual limb-prosthetic socket interface facilitate investigation of the mechanical interface and may serve as a potential tool for future prosthetic socket design. However, the success of such residual limb models to date has been limited, in large part due to inadequate material formulations used to approximate the mechanical behavior of residual limb soft tissues. Nonlinear finite-element analysis was used to simulate force-displacement data obtained during in vivo rate-controlled (1, 5, and 10 mm/s) cyclic indentation of the residual limb soft tissues of seven individuals with transtibial amputation. The finite-element models facilitated determination of an appropriate set of nonlinear elastic material coefficients for bulk soft tissue at discrete clinically relevant test locations. Axisymmetric finite-element models of the residual limb bulk soft tissue in the vicinity of the test location, the socket wall and the indentor tip were developed incorporating contact analysis, large displacement, and large strain, and the James-Green-Simpson nonlinear elastic material formulation. Model dimensions were based on medical imaging studies of the residual limbs. The material coefficients were selected such that the normalized sum of square error (NSSE) between the experimental and finite-element model indentor tip reaction force was minimized. A total of 95% of the experimental data were simulated using the James-Green-Simpson material formulation with an NSSE less than 5%. The respective James-Green-Simpson material coefficients varied with subject, test location, and indentation rate. Therefore, these coefficients cannot be readily extrapolated to other sites or individuals, or to the same site and individual some time after testing
On one loop corrections in higher spin gravity
We propose an approach to compute one-loop corrections to the four-point
amplitude in the higher spin gravities that are holographically dual to free
, and vector models. We compute the double-particle cut
of one-loop diagrams by expressing them in terms of tree level four-point
amplitudes. We then discuss how the remaining contributions to the complete
one-loop diagram can be computed. With certain assumptions we find nontrivial
evidence for the shift in the identification of the bulk coupling constant and
in accordance with the previously established result for the vacuum
energy.Comment: 25 pages, several figures; few comments added, the discussion of the
incompleteness of Vasiliev equations reduced; replaced with the published
versio
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