Sato-Tate equidistribution for families of Hecke-Maass forms on SL(n,R)/SO(n)

We establish the Sato-Tate equidistribution of Hecke eigenvalues on average for families of Hecke--Maass cusp forms on SL(n,R)/SO(n). For each of the principal, symmetric square and exterior square L-functions we verify that the families are essentially cuspidal and deduce the level distribution with restricted support of the low-lying zeros. We also deduce average estimates toward Ramanujan

Public employment and the double role of bureaucrats

Bureaucrats in the government sector have a double role since they are both suppliers and demanders of public employment; they are publicly employed (supply labor) and they have an important say in deciding the size of the municipal employment (demand labor). In this paper we present and estimate a theoretical model that focuses on this double role of bureaucrats. The predictions from the theoretical model are supported by our empirical results: The estimates based on data from Swedish municipalities 1990–2002, show that wages have smaller effects on the demand for bureaucrats than on the demand for other types of public employees. Actually wages have no significant effect on the number of bureaucrats the municipality employs.Public employment; bureaucrats

The Orbital Ephemeris and X-Ray Light Curve of Cyg X-3

The orbital dynamics of Cyg X-3 are a key to understanding this enigmatic X-ray binary. Recent observations by the RXTE ASM and the OSSE instrument on GRO enable us to extend the baseline of arrival time measurements and test earlier models of orbital period evolution. We derive new quadratic and cubic ephemerides from the soft X-ray data (including ASM). We find a significant shift between the predicted soft X-ray phase and the light curve phase measured by OSSE from ~44 to 130 keV. Some of the apparent phase shift may be caused by a difference in light curve shape.Comment: 5 pages, 2 figures, LaTeX (aipproc); to be published in the Proceedings of the 4th Compton Symposiu

Migration and Local Public Services

Using unique Swedish micro data we examine the impact of local public services on community choice. The choice of community is modeled as a choice between a discrete set of alternatives. The US literature has produced conflicting evidence with respect to the importance of local public services. We find a robust positive (negative) relationship between local public services (local income tax rates) and the residential choices of short-distance migrants (defined as those moving within a local labor market). However, local public characteristics are less important for migrants who entered from other local labor markets. Using information on subsequent mobility, we also investigate whether the last result is due to lack of information about the characteristics of the local public sector. The evidence suggests that this is not the case.Migration; Local public services; Tiebout; Discrete choice; repeat migration

Direct displacement effects of labour market programmes: the case of Sweden

Using a panel of 260 Swedish municipalities over the period 1987-1996, this paper investigates the direct displacement effects of active labour market programmes (ALMPs). Compared to earlier studies on this topic, we have more and better data. From our GMM estimations, we find that (i) there are direct displacement effects from those ALMPs that generate subsidised labour (in the order of approximately 65 percent), but there seems to be no (significant) displacement effects from training, (ii) most ALMPs seem to increase labour force participation, and (iii) the adjustment to the optimal level of employment seems to be sluggish. A consequence of (ii) is that the earlier studies have overstated the displacement effects (since they nomalised with the labour force).Labour market programmes; Displacement effects; GMM estimation

Perturbation-based Distributed Beamforming for Wireless Relay Networks

This paper deals with distributed beamforming techniques for wireless networks with half-duplex amplify-and-forward relays. Existing schemes optimize the beamforming weights based on the assumption that channel state information (CSI) is available at the relays. We propose to use adaptive beamforming based on deterministic perturbations and limited feedback (1-bit) from the destination to the relays in order to avoid CSI at the relays. Two scalable perturbation schemes are considered and practical implementation aspects are addressed. Simulation results confirm that the proposed techniques closely approach optimum performance and have satisfactory tracking properties in time-varying environments.Comment: 5 pages, 5 figures; accepted at IEEE GLOBECOM 2008, New Orleans, LA, Nov 30 - Dec 4, 200

Inequality and crime: separating the effects of permanent and transitory income

Earlier studies on income inequality and crime have typically used total income or total earnings. However, it is quite likely that it is changes in permanent rather than in transitory income that affects crime rates. The purpose of this paper is therefore to disentangle the two effects by, first, estimating region-specific inequality in permanent and transitory income and, second, estimating crime equations with the two separate income components as explanatory variables. The results indicate that it is important to separate the two effects; while an increase in the inequality in permanent income yields a positive and significant effect on total crimes and three different property crimes, an increase in the inequality in transitory income has no significant effect on any type of crime. Using a traditional, aggregate, measure of income yields mainly insignificant effects on crime.Crime; permanent income; transitory income