834 research outputs found

    Upper limits on gravitational wave emission from 78 radio pulsars [Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (042001)]

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    This paper was published online on 3 August 2007 with a formatting error in the fifty-first affiliation in the author list.The affiliation should read as ‘‘University of Western Australia, Crawley, WA 6009, Australia.’’ The affiliation has beencorrected as of 4 March 2008. The affiliation is incorrect in the printed version of the journal

    Erratum: First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds (Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (022001))

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    This paper was published online on 9 July 2007 with incorrect affiliation numbering in the author list. The affiliations have been corrected as of 23 July 2007. The text is correct in the printed version of the journal

    All-sky search for periodic gravitational waves in LIGO S4 data (Physical Review D - Particles, Fields, Gravitation and Cosmology (2008) 77, (022001))

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    This paper was published online on 10 January 2008 with a formatting error in the forty-ninth affiliation in the author list. The affiliation should read as ‘‘University of Western Australia, Crawley, WA 6009, Australia.’’ The affiliation hasbeen corrected as of 29 February 2008. The affiliation is incorrect in the printed version of the journal

    First cross-correlation analysis of interferometric and resonant-bar gravitational-wave data for stochastic backgrounds (Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (022001))

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    This paper was published online on 9 July 2007 with a formatting error in the fiftieth affiliation in the author list. Theaffiliation should read as ‘‘University of Western Australia, Crawley, WA 6009, Australia.’’ The affiliation has beencorrected as of 4 March 2008. The affiliation is incorrect in the printed version of the journal

    Inflation with a constant ratio of scalar and tensor perturbation amplitudes

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    The single scalar field inflationary models that lead to scalar and tensor perturbation spectra with amplitudes varying in direct proportion to one another are reconstructed by solving the Stewart-Lyth inverse problem to next-to-leading order in the slow-roll approximation. The potentials asymptote at high energies to an exponential form, corresponding to power law inflation, but diverge from this model at low energies, indicating that power law inflation is a repellor in this case. This feature implies that a fine-tuning of initial conditions is required if such models are to reproduce the observations. The required initial conditions might be set through the eternal inflation mechanism. If this is the case, it will imply that the spectral indices must be nearly constant, making the underlying model observationally indistinguishable from power law inflation.Comment: 20 pages, 7 figures. Major changes to the Introduction following referee's comments. One figure added. Some other minor changes. No conclusion was modifie

    (Anti-)self-dual homogeneous vacuum gluon field as an origin of confinement and SUL(NF)×SUR(NF)SU_L(N_F)\times SU_R(N_F) symmetry breaking in QCD

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    It is shown that an (anti-)self-dual homogeneous vacuum gluon field appears in a natural way within the problem of calculation of the QCD partition function in the form of Euclidean functional integral with periodic boundary conditions. There is no violation of cluster property within this formulation, nor are parity, color and rotational symmetries broken explicitly. The massless limit of the product of the quark masses and condensates, mf⟨ψˉfψf⟩m_f \langle \bar\psi_f \psi_f \rangle, is calculated to all loop orders. This quantity does not vanish and is proportional to the gluon condensate appearing due to the nonzero strength of the vacuum gluon field. We conclude that the gluon condensate can be considered as an order parameter both for confinement and chiral symmetry breaking.Comment: 16 pages, LaTe

    Au+Au Reactions at the AGS: Experiments E866 and E917

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    Particle production and correlation functions from Au+Au reactions have been measured as a function of both beam energy (2-10.7AGeV) and impact parameter. These results are used to probe the dynamics of heavy-ion reactions, confront hadronic models over a wide range of conditions and to search for the onset of new phenomena.Comment: 12 pages, 14 figures, Talk presented at Quark Matter '9

    Improved Determination of the Mass of the 1−+1^{-+} Light Hybrid Meson From QCD Sum Rules

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    We calculate the next-to-leading order (NLO) αs\alpha_s-corrections to the contributions of the condensates and 2^2 in the current-current correlator of the hybrid current g\barq(x)\gamma_{\nu}iF_{\mu\nu}^aT^aq(x) using the external field method in Feynman gauge. After incorporating these NLO contributions into the Laplace sum-rules, the mass of the JPCJ^{PC}=1−+1^{-+} light hybrid meson is recalculated using the QCD sum rule approach. We find that the sum rules exhibit enhanced stability when the NLO αs\alpha_s-corrections are included in the sum rule analysis, resulting in a 1−+1^{-+} light hybrid meson mass of approximately 1.6 GeV.Comment: revtex4, 10 pages, 7 eps figures embedded in manuscrip

    Human dendritic cells express the complement receptor immunoglobulin which regulates T cell responses

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    The B7 family-related protein V-set and Ig containing 4 (VSIG4), also known as Z39Ig and Complement Immunoglobulin Receptor (CRIg), is the most recent of the complement receptors to be identified, with substantially distinct properties from the classical complement receptors. The receptor displays both phagocytosis–promoting and anti-inflammatory properties. The receptor has been reported to be exclusively expressed in macrophages. We now present evidence, that CRIg is also expressed in human monocyte-derived dendritic cells (MDDC), including on the cell surface, implicating its role in adaptive immunity. Three CRIg transcripts were detected and by Western blotting analysis both the known Long (L) and Short (S) forms were prominent but we also identified another form running between these two. Cytokines regulated the expression of CRIg on dendritic cells, leading to its up- or down regulation. Furthermore, the steroid dexamethasone markedly upregulated CRIg expression, and in co-culture experiments, the dexamethasone conditioned dendritic cells caused significant inhibition of the phytohemagglutinin-induced and alloantigen-induced T cell proliferation responses. In the alloantigen-induced response the production of IFNγ, TNF-α, IL-13, IL-4, and TGF-β1, were also significantly reduced in cultures with dexamethasone-treated DCs. Under these conditions dexamethasone conditioned DCs did not increase the percentage of regulatory T cells (Treg). Interestingly, this suppression could be overcome by the addition of an anti-CRIg monoclonal antibody to the cultures. Thus, CRIg expression may be a control point in dendritic cell function through which drugs and inflammatory mediators may exert their tolerogenic- or immunogenic-promoting effects on dendritic cells.Usma Munawara, Khalida Perveen, Annabelle G. Small, Trishni Putty, Alex Quach, Nick N. Gorgani, Charles S. Hii, Catherine A. Abbott and Antonio Ferrant
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