Top-quark pair production in association with a ZZ boson in the 4ℓ\ell channel with the ATLAS experiment

The cross section of the $t\bar{t}Z$~and $t\bar{t}W$~processes are measured in a simultaneous fit using 36.1 $\text{fb}^{-1}$ of of proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS experiment at the LHC. In addition, a fit is performed in the 4$\ell$ channel only, resulting in a cross section of $\sigma_{t\bar{t}Z} = 1.07 \pm 0.26 \,\text{pb}$. This result is consistent with the combined fit and agrees with the prediction by the Standard Model.Comment: Proceedings for the 11th International Workshop on Top Quark Physics (TOP2018). 4 pages, 2 figure

On the Modeling of the Income Distribution Business Cycle Dynamics

Empirically, the income share is procyclical for the low-income groups and acyclical for the top 5%. We find that business cycle models should consider overlapping generations and elastic labor supply in order to replicate this finding.income distribution, business cycle, overlapping generations

Nonsuperneutrality of Money in the Sidrauski Model with Heterogenous Agents

Superneutrality is demonstrated to no longer hold in the Sidrauski model as soon as agents are heterogenous with regard to their productivity. However, quantitative effects of inflation on the capital stock are found to be rather small.

Employment and Welfare Effects of a Two-Tier Unemployment Compensation System

In many OECD countries, e.g. in Germany, France, or the UK, unemploy-ment compensation consists of unemployment insurance and unemployment assistance. Unemployment assistance is provided subsequent to the expiration of entitlement to unemployment insurance and is lower. The effects of this two-tier unemployment compensation system are studied in a general equilibrium job search model with endogenous distributions of in-come, wealth, and employment which is calibrated with regard to the charac-teristics of the German economy. Our results are as follows: i) employment is a decreasing function of both unemployment insurance and unemployment assistance. ii) Savings are (not) a monotone increasing function of unemployment insurance (unemployment assistance payments). iii) Optimal unemployment compensation payments are found to be a decreasing function over time.Unemployment compensation, search unemployment, general equilibrium, overlapping generations

The Role of Robots and Automation in Space

Advanced space transportation systems based on the shuttle and interim upper stage will open the way to the use of large-scale industrial and commercial systems in space. The role of robot and automation technology in the cost-effective implementation and operation of such systems in the next two decades is discussed. Planning studies initiated by NASA are described as applied to space exploration, global services, and space industrialization, and a forecast of potential missions in each category is presented. The appendix lists highlights of space robot technology from 1967 to the present

Welfare Costs of Inflation in a Dynamic Economy with Search Unemployment and Endogenous Growth

Recent work on money and endogenous growth finds modest welfare costs of inflation. Furthermore, high inflation reduces the growth rate. We present a monetary endogenous growth model with labor market frictions in the form of search unemployment which is calibrated for the US economy. Interestingly, both employment and the growth rate may even increase with the rate of inflation depending on the elasticity of labor supply. Considering the transition dynamics following a change in the monetary policy, the optimal quarterly inflation rate is found to amount to approximately 3.5% in the benchmark case. A reduction of the inflation rate from its optimal value to zero results in a welfare loss equal to 0.3% of total consumption.Welfare costs of inflation, money demand, search unemployment, endogenous growth, transistion dynamics

An Evaluation of the Optical Maser Photon Rate Gyroscope

Mathematical development of resonant frequencies of electromagnetic cavity - Evaluation of optical maser photon rate gyroscop