3,473 research outputs found
Isospin violation in pion-nucleon scattering
We construct the complete effective chiral pion-nucleon Lagrangian in the
presence of virtual photons to one loop. As an application, we consider strong
and electromagnetic isospin violation for scattering of neutral pions off
nucleons. We show that for the scattering lengths these isospin violating terms
are of the same size as the purely hadronic ones. We also analyze
isospin-violating effects for the --term. These can be as large as 10%
for the absolute value but are negligible for the shift to the Cheng-Dashen
point.Comment: 13 pp, LaTeX, uses epsf, 1 fi
Crime, Unemployment, and Xenophobia? An Ecological Analysis of Right-Wing Election Results in Hamburg, 1986−2005
This paper investigates the consequences of immigration, crime and socio-economic depriviation for the performance of right-wing extremist and populist parties in the German city state of Hamburg between 1986 and 2005. The ecological determinants of voting for right-wing parties on the district level are compared to those for mainstream and other protest parties. Parallels and differences in spatial characteristics between right-wing extremist and populist parties' performance are identified. Our empirical results tend to confirm the general contextual sociological theory of right-wing radicalization by general social deprivation and immigration. Nevertheless they indicate that one has to be very cautious when interpreting the unemployment/crime - right-winger nexus. Moreover, crime does not seem to have a strong significant effect on right-wing populist parties' election successes despite its importance for their programmes and campaigns.elections, political extremism, labor market policy, welfare policy, immigration
Car Road Charging: Impact Assessment on German and Austrian Households
The authors apply a computable general equilibrium (CGE) modeling framework to carry out a two-country comparison for Austria and Germany assessing the impact of road charging (RC). The pricing policy measure is introduced for the private motorized transport mode and applies to the overall road network. To derive and compare distributional effects of passenger car RC, the mode-specific travel demand of private households is integrated into the CGE model. Furthermore, the modeling framework accounts for different household categories with respect to disposable net income and the corresponding travel demand profiles introduced in terms of behavioral mobility parameters as well as household travel expenditures. Comparing the country-specific results, we find country-specific differences in the impact of RC on household categories, as well as similarities. The differences that we find indicate the importance of particular parameters for the evaluation of infrastructure pricing policy reforms. We can relate differences to prevalent country-specific differences in sociodemographic characteristics, land use structure, territorial population distribution, as well as macroeconomic indicators. To add substance to the two-country impact assessment, a sensitivity analysis is carried out, introducing different RC revenue use schemes. We find differences in distributional effects under equity concerns to be closely related to the revenue use pattern as well as to country- and household-specific travel demand profiles.Computable general equilibrium model, redistributive effects, road charging
GD 99 - an unusual, rarely observed DAV white dwarf
New observations of GD 99 are analysed. The unusual pulsation behaviour,
showing both long and short periods, has been confirmed. All the available
periods show a grouping of short and long period modes with roughly regular
spacing. If we interpret the groups separately, a binary nature can be a
possible explanation as in the similar cases of WD 2350-0054 and G29-38.Comment: 2 pages, 1 eps figure; has been accepted for publication in
Communications in Asteroseismology (Vol. 150, 2007), Proceedings of the
Vienna Workshop on the Future of Asteroseismolog
Search for quasi-periodic signals in magnetar giant flares
Quasi-periodic oscillations (QPOs) discovered in the decaying tails of giant
flares of magnetars are believed to be torsional oscillations of neutron stars.
These QPOs have a high potential to constrain properties of high-density
matter. In search for quasi-periodic signals, we study the light curves of the
giant flares of SGR 1806-20 and SGR 1900+14, with a non-parametric Bayesian
signal inference method called DPO. The DPO algorithm models the raw
photon counts as a continuous flux and takes the Poissonian shot noise as well
as all instrument effects into account. It reconstructs the logarithmic flux
and its power spectrum from the data. Using this fully noise-aware method, we
do not confirm previously reported frequency lines at Hz
because they fall into the noise-dominated regime. However, we find two new
potential candidates for oscillations at Hz (SGR 1806-20) and Hz
(SGR 1900+14). If these are real and the fundamental magneto-elastic
oscillations of the magnetars, current theoretical models would favour
relatively weak magnetic fields G
(SGR 1806-20) and a relatively low shear velocity inside the crust compared to
previous findings
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