12,066 research outputs found
Simulation of Jet Quenching Observables in Heavy Ion Collisions at the LHC
Large transverse momentum jets provide unique tools to study dense QCD matter
in high-energy heavy-ion collisions. Results from RHIC on suppression of high
transverse momentum particles in Au+Au collisions indicate a significant energy
loss of leading partons in the dense and strongly interacting matter formed in
these collisions. The LHC will collide Pb ions at sqrt(s_NN)=5500 GeV, where
the cross section of hard scattering will increase dramatically. Large
production rates, the large acceptance of the CMS calorimeters and tracking
system, combined with the capability of triggering on jets, will extend the
transverse momentum reach of charged particle spectra and nuclear modification
factors up to p_T>200 GeV/c.Comment: 6 pages, 5 figures. Presented at the 19th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006), Shanghai, China,
November 14-20, 2006. [Grant numbers added in the acknowledgment.
Leverage and productivity growth in emerging economies: Is there a threshold effect?
While credit is essential for investment, innovation and economic growth, there are risks to unfettered credit booms. The present paper provides an innovative micro-economic approach to identify the threshold leverage beyond which corporate indebtedness becomes âexcessiveâ. In particular, the paper hypothesizes a non-linear relationship in that moderate leverage could boost growth while very high leverage could restrict total factor productivity growth, through increased likelihood of financial distress and bankruptcy. Estimates of a threshold model for a group of emerging CEE countries confirm the non-linear relationship, after controlling for various firm, industry and financial market characteristics.Financial support from ESRC grant RES-062-23-0986 is gratefully acknowledge
Raman scattering near a d-wave Pomeranchuk instability
Motivated by recent transport and neutron scattering experiments suggesting
an orientational symmetry breaking in underdoped cuprates we present a
theoretical study of Raman scattering near a d-wave Pomeranchuk instability
(PI). The d-wave component of Raman scattering from electrons and phonons
allows to study directly order parameter fluctuations associated with the PI.
Approaching the PI from the normal state by lowering the temperature a central
peak emerges both in electronic and, as an additional low-frequency feature, in
phononic scattering. Approaching the PI in the superconducting state at low
temperature by decreasing the doping concentration the central peak is replaced
by a soft mode with strongly decreasing width and energy and increasing
spectral weight. These predicted low-energy features in Raman scattering could
confirm in a rather direct way the presence of a PI in high-temperature cuprate
superconductors and in Sr3Ru2O7.Comment: 26 pages, 9 figure
Ultrafast absorption kinetics of NADH in folded and unfolded conformations
The non-radiative energy transfer is shown to occur on a ~3ps time scale for NADH in the folded form in H2O. Addition of methanol thermodynamically favours the open form, for which energy transfer does not occur
The super algebra and its associated generalized KdV hierarchies
We construct the super algebra as a certain reduction of the
second Gel'fand-Dikii bracket on the dual of the Lie superalgebra of
super pseudo-differential operators. The algebra is put in manifestly
supersymmetric form in terms of three superfields , with
being the energy momentum tensor and and being
conformal spin and superfields respectively. A search for integrable
hierarchies of the generalized KdV variety with this algebra as Hamiltonian
structure gives three solutions, exactly the same number as for the
(super KdV) and (super Boussinesq) cases.Comment: 16 pages, LaTeX, UTAS-PHYS-92-3
- âŠ