Adiabatic exchange approximation in electron scattering from multi-electron atoms

Adiabatic exchange equation in electron scattering from multi-electron atoms - elastic scattering cross sections for sodium and lithiu

Minding the Gap in Holographic Models of Interacting Fermions

We study the holographic dual of fermions interacting in a Schwarzschild-AdS$_{d+1}$ background via a dipole (Pauli) coupling sourced by a probe gauge field. We find quite generally that a gap forms in the dual operator spectrum as the Pauli coupling is strengthened. Previous investigations have observed this behavior in analogous constructions with Reissner-Nordstr\"om-AdS (RN-AdS$_4$) backgrounds, but the emergence of log-oscillatory behavior in those models' spectra prevented identification of the underlying gapping mechanism. Our model obviates this issue through its modified geometry and traces the gapping mechanism back to the bulk dynamics. We show in general that there is a duality between zeros for large positive values of the coupling and poles in the spectrum for equivalent couplings but with opposite sign as seen recently in the RN-AdS$_4$ background\cite{alsup}. The duality arises from the two possible quantizations for computing the retarded propagator. Coupled with the earlier string results\cite{gauntlett,gubser2} that Fermi surfaces are generally absent from the spectral function, our finding that the Pauli term engineers the gap suggests that the model examined here offers a way of studying non-perturbative physics in fermionic matter at finite density typified by Mott insulating systems.Comment: 7 pages, 6 figure

Monthly mean global satellite data sets available in CCM history tape format

Satellite data for climate monitoring have become increasingly important over the past decade, especially with increasing concern for inadvertent antropogenic climate change. Although most satellite based data are of short record, satellites can provide the global coverage that traditional meteorological observations network lack. In addition, satellite data are invaluable for the validation of climate models, and they are useful for many diagnostic studies. Herein, several satellite data sets were processed and transposed into 'history tape' format for use with the Community Climate Model (CCM) modular processor. Only a few of the most widely used and best documented data sets were selected at this point, although future work will expand the number of data sets examined as well as update the archived data sets. An attempt was made to include data of longer record and only monthly averaged data were processed. For studies using satellite data over an extended period, it is important to recognize the impact of changes in instrumentation, drift in instrument calibration, errors introduced by retrieval algorithms and other sources of errors such as those resulting from insufficient space and/or time sampling

Theoretical photodetachment cross section for the negative atomic oxygen ion

Theoretical photodetachment cross section for negative atomic oxygen io

Defining and Meeting the Demand for Agricultural Machinery in China: A Case Study of John Deere

China, Machinery markets, John Deere, Agribusiness, Demand and Price Analysis, Marketing, Public Economics,