12,652 research outputs found
Summary of the Structure Functions and Low-x working group
We report a summary of the structure function working group which covers a
wide range of the recent results from HERA, Tevatron, RHIC, and JLab
experiments, and many theoretical issues from low x to high x.Comment: 20 pages, presented at 13th International Workshop on Deep Inelastic
Scattering (DIS 05), Madison, Wisconsin, 27 Apr - 1 May 200
Indirect detection of gravitino dark matter including its three-body decays
It was recently pointed out that in supersymmetric scenarios with gravitino
dark matter and bilinear R-parity violation, gravitinos with masses below Mw
typically decay with a sizable branching ratio into the 3-body final states
W^*+lepton and Z^*+neutrino. In this paper we study the indirect detection
signatures of gravitino dark matter including such final states. First, we
obtain the gamma ray spectrum from gravitino decays, which features a
monochromatic contribution from the decay into photon+neutrino and a continuum
contribution from the three-body decays. After studying its dependence on
supersymmetric parameters, we compute the expected gamma ray fluxes and derive
new constraints, from recent FERMI data, on the R-parity breaking parameter and
on the gravitino lifetime. Indirect detection via antimatter searches, a new
possibility brought about by the three-body final states, is also analyzed. For
models compatible with the gamma ray observations, the positron signal is found
to be negligible whereas the antiproton one can be significant.Comment: 21 pages,16 figures v2: one numerical error corrected, one figure
added, main results unchange
Non-stationarity of isomorphism between AF algebras defined by stationary Bratteli diagrams
We first study situations where the stable AF-algebras defined by two square
primitive nonsingular incidence matrices with nonnegative integer matrix
elements are isomorphic even though no powers of the associated automorphisms
of the corresponding dimension groups are isomorphic. More generally we
consider neccessary and sufficient conditions for two such matrices to
determine isomorphic dimension groups. We give several examples.Comment: 16 page
Holographic Estimate of Oblique Corrections for Technicolor
We study the oblique corrections to the electroweak interaction in the
holographic model of technicolor theories. The oblique S parameter is expressed
in terms of a solution to the equations of motion for the AdS bulk gauge
fields. By analyzing the solution, we establish a rigorous proof that the S
parameter is positive and is reduced by walking. We also present the precise
numerical values for the S parameter of various technicolor models by solving
the equations numerically.Comment: 10 pages, 1 figure, RevTeX 4.0: published version. references adde
High Temperature Superfluid and Feshbach Resonance
We study an effective field theory describing cold fermionic atoms near a
Feshbach resonance. The theory gives a unique description of the dynamics in
the limit that the energy of the Feshbach resonance is tuned to be twice that
of the Fermi surface. We show that in this limit the zero temperature
superfluid condensate is of order the Fermi energy, and obtain a critical
temperature Comment: 9 pages, 3 figures, RevTe
Higher Dimensional Operators in the MSSM
The origin and the implications of higher dimensional effective operators in
4-dimensional theories are discussed in non-supersymmetric and supersymmetric
cases. Particular attention is paid to the role of general,
derivative-dependent field redefinitions which one can employ to obtain a
simpler form of the effective Lagrangian. An application is provided for the
Minimal Supersymmetric Standard Model extended with dimension-five R-parity
conserving operators, to identify the minimal irreducible set of such operators
after supersymmetry breaking. Among the physical consequences of this set of
operators are the presence of corrections to the MSSM Higgs sector and the
generation of "wrong"-Higgs Yukawa couplings and fermion-fermion-scalar-scalar
interactions. These couplings have implications for supersymmetry searches at
the LHC.Comment: Contribution to the proceedings of the "Susy 2008" conference; (6
pages
A Faddeev-Niemi Solution that Does Not Satisfy Gauss' Law
Faddeev and Niemi have proposed a reformulation of SU(2) Yang-Mills theory in
terms of a U(1) gauge theory with 8 off-shell degrees of freedom. We present a
solution to Faddeev and Niemi's formulation which does not solve the SU(2)
Yang-Mills Gauss constraints. This demonstrates that the proposed reformulation
is inequivalent to Yang-Mills, but instead describes Yang-Mills coupled to a
particular choice of external charge.Comment: 10 pages, no figure
An animal experimental study on pubourethral ligament restoration with platelet rich plasma for the treatment of stress urinary incontinence.
Introduction: Minimally invasive methods for injured ligament and tendon restoration have been developed and gained popularity in recent years. Injury and relaxation of the pubourethral ligament (PUL) can lead to stress urinary incontinence (SUI). The aim of this study was to investigate the impact of injecting platelet rich plasma (PRP) into the PUL following its surgical transection resulting in SUI, confirmed by leak point pressure (LPP) measurements pre- and post-intervention in an experimental animal model. Material and methods: Twenty female adult Sprague-Dawley rats were assigned in 2 groups: 1) treatment group with transection of the PUL and application of PRP at the time of transection and at one month follow-up and 2) a control group, with transection of the PUL only. Leak point pressures (LPPs) were measured prior to transection, immediately following the transection and at 1 and 2 months in both groups. Results: The median LPPs for the control group were: LPP - preT: 35.6 (29.8-44.8) cmH2O, LPP - postT: 14.6 (5.8-19.0) cmH2O, LPP - 1 month: 27.3 (19.2-33.8) cmH2O, LPP - 2 months: 29.0 (27.0-34.0) cmH2O, whereas for the PRP group were: LPP-preT: 40.5 (33.2-46.3) cmH2O, LPP - postT: 15.7 (3.0-24.0) cmH2O, LPP - 1month: 31.6 (24.8-37.4) cmH2O, LPP - 2 months: 36.8 (32.5-45.4) cmH2O. PRP injections on transected PULs significantly increased LPPs at one month follow-up [31.6 cmH2O vs. 27.3 cmH2O, p = .043]. This effect was confirmed at two months [36.8 cmH2O vs. 29.0 cmH2O, p <.001]. Conclusions: Injection of PRP into transected PULs significantly improved LPPs at one and two months' follow-up. However, further experimental and clinical research is needed to evaluate the safety and efficacy of this treatment, in clinical practice
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