36 research outputs found
Bethe Ansatz solutions for highest states in SYM and AdS/CFT duality
We consider the operators with highest anomalous dimension in the
compact rank-one sectors and of super Yang-Mills. We study the flow of from weak to strong 't
Hooft coupling by solving (i) the all-loop gauge Bethe Ansatz, (ii)
the quantum string Bethe Ansatz. The two calculations are carefully compared in
the strong coupling limit and exhibit different exponents in the leading
order expansion . We find and
for the gauge or string solution. This strong coupling discrepancy is not
unexpected, and it provides an explicit example where the gauge Bethe Ansatz
solution cannot be trusted at large . Instead, the string solution
perfectly reproduces the Gubser-Klebanov-Polyakov law . In particular, we provide an analytic expression for the
integer level as a function of the U(1) charge in both sectors.Comment: 42 pages, JHEP style LaTe
Theory and Applications of X-ray Standing Waves in Real Crystals
Theoretical aspects of x-ray standing wave method for investigation of the
real structure of crystals are considered in this review paper. Starting from
the general approach of the secondary radiation yield from deformed crystals
this theory is applied to different concreat cases. Various models of deformed
crystals like: bicrystal model, multilayer model, crystals with extended
deformation field are considered in detailes. Peculiarities of x-ray standing
wave behavior in different scattering geometries (Bragg, Laue) are analysed in
detailes. New possibilities to solve the phase problem with x-ray standing wave
method are discussed in the review. General theoretical approaches are
illustrated with a big number of experimental results.Comment: 101 pages, 43 figures, 3 table
Linear Collider Capabilities for Supersymmetry in Dark Matter Allowed Regions of the mSUGRA Model
Recent comparisons of minimal supergravity (mSUGRA) model predictions with
WMAP measurements of the neutralino relic density point to preferred regions of
model parameter space. We investigate the reach of linear colliders (LC) with
and 1 TeV for SUSY in the framework of the mSUGRA model. We find
that LCs can cover the entire stau co-annihilation region provided \tan\beta
\alt 30. In the hyperbolic branch/focus point (HB/FP) region of parameter
space, specialized cuts are suggested to increase the reach in this important
``dark matter allowed'' area. In the case of the HB/FP region, the reach of a
LC extends well past the reach of the CERN LHC. We examine a case study in the
HB/FP region, and show that the MSSM parameters and can be
sufficiently well-measured to demonstrate that one would indeed be in the HB/FP
region, where the lightest chargino and neutralino have a substantial higgsino
component.Comment: 29 pages, 15 EPS figures; updated version slightly modified to
conform with published versio