133 research outputs found
Five-dimensional N=4, SU(2) X U(1) Gauged Supergravity from Type IIB
We construct the complete and explicit non-linear Kaluza-Klein ansatz for
deriving the bosonic sector of N=4 SU(2)\times U(1) gauged five-dimensional
supergravity from the reduction of type IIB supergravity on S^5. This provides
the first complete example of such an S^5 reduction that includes non-abelian
gauge fields, and it allows any bosonic solution of the five-dimensional N=4
gauged theory to be embedded in D=10.Comment: latex, 12 page
Consistent SO(6) Reduction Of Type IIB Supergravity on S^5
Type IIB supergravity can be consistently truncated to the metric and the
self-dual 5-form. We obtain the complete non-linear Kaluza-Klein S^5 reduction
Ansatz for this theory, giving rise to gravity coupled to the fifteen
Yang-Mills gauge fields of SO(6) and the twenty scalars of the coset
SL(6,R)/SO(6). This provides a consistent embedding of this subsector of N=8,
D=5 gauged supergravity in type IIB in D=10. We demonstrate that the
self-duality of the 5-form plays a crucial role in the consistency of the
reduction. We also discuss certain necessary conditions for a theory of gravity
and an antisymmetric tensor in an arbitrary dimension D to admit a consistent
sphere reduction, keeping all the massless fields. We find that it is only
possible for D=11, with a 4-form field, and D=10, with a 5-form. Furthermore,
in D=11 the full bosonic structure of eleven-dimensional supergravity is
required, while in D=10 the 5-form must be self-dual. It is remarkable that
just from the consistency requirement alone one would discover D=11 and type
IIB supergravities, and that D=11 is an upper bound on the dimension.Comment: Latex, 14 pages, typos corrected and comments adde
Classification of p-branes, NUTs, Waves and Intersections
We give a full classification of the multi-charge supersymmetric -brane
solutions in the massless and massive maximal supergravities in dimensions
obtained from the toroidal reduction of eleven-dimensional
supergravity. We derive simple universal rules for determining the fractions of
supersymmetry that they preserve. By reversing the steps of dimensional
reduction, the -brane solutions become intersections of -branes, NUTs and
waves in D=10 or D=11. Having classified the lower-dimensional -branes, this
provides a classification of all the intersections in D=10 and D=11 where the
harmonic functions depend on the space transverse to all the individual
objects. We also discuss the structure of U-duality multiplets of -brane
solutions, and show how these translate into multiplets of harmonic and
non-harmonic intersections.Comment: Latex, 67 pages, minor correction
Modelling and Interpreting The Effects of Spatial Resolution on Solar Magnetic Field Maps
Different methods for simulating the effects of spatial resolution on
magnetic field maps are compared, including those commonly used for
inter-instrument comparisons. The investigation first uses synthetic data, and
the results are confirmed with {\it Hinode}/SpectroPolarimeter data. Four
methods are examined, one which manipulates the Stokes spectra to simulate
spatial-resolution degradation, and three "post-facto" methods where the
magnetic field maps are manipulated directly. Throughout, statistical
comparisons of the degraded maps with the originals serve to quantify the
outcomes. Overall, we find that areas with inferred magnetic fill fractions
close to unity may be insensitive to optical spatial resolution; areas of
sub-unity fill fractions are very sensitive. Trends with worsening spatial
resolution can include increased average field strength, lower total flux, and
a field vector oriented closer to the line of sight. Further-derived quantities
such as vertical current density show variations even in areas of high average
magnetic fill-fraction. In short, unresolved maps fail to represent the
distribution of the underlying unresolved fields, and the "post-facto" methods
generally do not reproduce the effects of a smaller telescope aperture. It is
argued that selecting a method in order to reconcile disparate spatial
resolution effects should depend on the goal, as one method may better preserve
the field distribution, while another can reproduce spatial resolution
degradation. The results presented should help direct future inter-instrument
comparisons.Comment: Accepted for publication in Solar Physics. The final publication
(including full-resolution figures) will be available at
http://www.springerlink.co
Constraints on background contributions from K+ Lambda electroproduction
Results for response functions for kaon electroproduction on the proton are
presented. A tree-level hadrodynamical model is adopted and it is shown that
some of the electroproduction response functions are particularly powerful with
the eye on gaining control over the parameterization of the background
diagrams. The existing data set for the p(e,e'K+)Lambda reaction appears to
rule out the use of a g_{K+ Lambda p} coupling constant beyond the boundaries
of softly broken SU(3) flavor symmetry. Also the use of soft hadronic form
factors, which has been proposed as a valid alternative for a hadrodynamical
description of the p(gamma,K+)Lambda data in the resonance region, seems to be
disfavored by the magnitude of the measured p(e,e'K+)Lambda cross sections.Comment: Accepted for publication in PRC. Includes new data, additional
paragraph and figur
TP53 mutation variant allele frequency of >/-10% is associated with poor prognosis in therapy-related myeloid neoplasms
Published online: 11 April 2023Revised diagnostic criteria for myeloid neoplasms (MN) issued by the International Consensus Classification (ICC) and the World Health Organization (WHO) recommended major change pertaining to TP53-mutated (TP53mut) MN. However, these assertions have not been specifically examined in therapy-related myeloid neoplasm (t-MN), a subset enriched with TP53mut. We analyzed 488 t-MN patients for TP53mut. At least one TP53mut with variant allele frequency (VAF) ≥ 2% with or without loss of TP53 locus was noted in 182 (37.3%) patients and 88.2% of TP53mut t-MN had a VAF ≥10%. TP53mut t-MN with VAF ≥ 10% had a distinct clinical and biological profile compared to both TP53mut VAF 10% blasts had inferior survival compared to <5%. In summary, TP53mut VAF ≥10% signified a clinically and molecularly homogenous cohort regardless of the allelic status.Mithun Vinod Shah, Elizabeth Ngoc Hoa Tran, Syed Shah, Rakchha Chhetri, Anmol Baranwal, Dariusz Ladon, Carl Shultz, Aref Al-Kali, Anna L. Brown, Dong Chen, Hamish S. Scott, Patricia Greipp, Daniel Thomas, Hassan B. Alkhateeb, Deepak Singhal, Naseema Gangat, Sharad Kumar, Mrinal M. Patnaik, Christopher N. Hahn, Chung Hoow Kok, Ayalew Tefferi and Devendra K. Hiwas
Coronal Field Opens at Lower Height During the Solar Cycles 22 and 23 Minimum Periods: IMF Comparison Suggests the Source Surface Should Be Lowered
Separation of the Longitudinal and Transverse Cross Sections in the p(ee'K)Lambda and p(ee'K)Sigma Reactions
We report measurements of cross sections for the reaction p(e,e'K)Y, for both
the Lambda and Sigma_0 hyperon states, at an invariant mass of W=1.84 GeV and
four-momentum transfers 0.5<Q2<2 (GeV/c)2. Data were taken for three values of
virtual photon polarization, allowing the decomposition of the cross sections
into longitudinal and transverse components. The Lambda data is a revised
analysis of prior work, whereas the Sigma_0 results have not been previously
reported.Comment: 17 pages, 18 figures, REVTEX 4, submitted to Physical Review
Operation and performance of the ATLAS semiconductor tracker
The semiconductor tracker is a silicon microstrip detector forming part of the inner tracking system of the ATLAS experiment at the LHC. The operation and performance of the semiconductor tracker during the first years of LHC running are described. More than 99% of the detector modules were operational during this period, with an average intrinsic hit efficiency of (99.74±0.04)%. The evolution of the noise occupancy is discussed, and measurements of the Lorentz angle, δ-ray production and energy loss presented. The alignment of the detector is found to be stable at the few-micron level over long periods of time. Radiation damage measurements, which include the evolution of detector leakage currents, are found to be consistent with predictions and are used in the verification of radiation background simulations
Search for H→γγ produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector
A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states from the top quark decays. The dataset used corresponds to an integrated luminosity of 4.5 fb−14.5 fb−1 of proton–proton collisions at a center-of-mass energy of 7 TeV and 20.3 fb−1 at 8 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. No significant excess over the background prediction is observed and upper limits are set on the tt¯H production cross section. The observed exclusion upper limit at 95% confidence level is 6.7 times the predicted Standard Model cross section value. In addition, limits are set on the strength of the Yukawa coupling between the top quark and the Higgs boson, taking into account the dependence of the tt¯H and tH cross sections as well as the H→γγ branching fraction on the Yukawa coupling. Lower and upper limits at 95% confidence level are set at −1.3 and +8.0 times the Yukawa coupling strength in the Standard Model
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