Mapping monojet constraints onto Simplified Dark Matter Models

The move towards simplified models for Run II of the LHC will allow for stronger and more robust constraints on the dark sector. However there already exists a wealth of Run I data which should not be ignored in the run-up to Run II. Here we reinterpret public constraints on generic beyond-standard-model cross sections to place new constraints on a simplified model. We make use of an ATLAS search in the monojet $+$ missing energy channel to constrain a representative simplified model with the dark matter coupling to an axial-vector $Z'$. We scan the entire parameter space of our chosen model to set the strongest current collider constraints on our model using the full 20.3 fb$^{-1}$ ATLAS 8 TeV dataset and provide predictions for constraints that can be set with 20 fb$^{-1}$ of 14 TeV data. Our technique can also be used for the interpretation of Run II data and provides a broad benchmark for comparing future constraints on simplified models.Comment: 19 pages, 6 figures; v2: added references, corrected mistake in discussion of previous results; v3: major content additions, version accepted by JHE

The two levels of natural law thinking

Central parts of the natural law theories of Grotius and Pufendorf assume that persons by nature have individual realms of their own (suum), violations of which constitute a wrong. This is the basis for their accounts of promises, ownership and reactions against wrongs. These accounts are significantly independent of any assumption that a superior being imposes obligations: rather, the individuals themselves create obligations by their own acts of will. The translator's introducton draws attention to the author's relation to Hägerström, and remarks briefly on related points in Ames, Köhler and Georges Dav

Universal scaling at non-thermal fixed points of a two-component Bose gas

Quasi-stationary far-from-equilibrium critical states of a two-component Bose gas are studied in two spatial dimensions. After the system has undergone an initial dynamical instability it approaches a non-thermal fixed point. At this critical point the structure of the gas is characterised by ensembles of (quasi-)topological defects such as vortices, skyrmions and solitons which give rise to universal power-law behaviour of momentum correlation functions. The resulting power-law spectra can be interpreted in terms of strong-wave-turbulence cascades driven by particle transport into long-wave-length excitations. Scaling exponents are determined on both sides of the miscible-immiscible transition controlled by the ratio of the intra-species to inter-species couplings. Making use of quantum turbulence methods, we explain the specific values of the exponents from the presence of transient (quasi-)topological defects.Comment: 13 pages, 12 figure

Configuration of Distributed Message Converter Systems using Performance Modeling

To find a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tools to analyse potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can be evaluated. In this paper we present a systematic method to find a satisfactory configuration with feasible effort, based on a two-step approach. First, using performance estimates a hardware configuration is determined and then the software configuration is incrementally optimized evaluating Layered Queueing Network models. We applied this method to the design of performant EDI converter systems in the financial domain, where increasing message volumes need to be handled due to the increasing importance of B2B interaction

Welfare Theory: History and Modern Results

This paper contains a fairly brief, but self-contained, version of the history of welfare economics, as well as the more modern welfare results. We introduce public goods and asymmetric information, and we hint at some of the modern mechanism design results. The paper also contains a section on welfare measures in a dynamic economy.Welfare Theory;

Loss of Age-Restricted Status and Property Values: Youngtown Arizona

This study finds evidence of a large premium in house prices in Youngtown Arizona attributable to its age-restricted status. The persistence of a premium over long periods of time suggests that age restricted status can be a valuable component of the housing bundle, much like physical characteristics or location. It is likely that age-restricted status acts as a signal that the community provides facilities and services that meet the needs of the elderly and the assurance that those facilities and services will be available in the future. This assurance reduces uncertainty about the future and it is the reduced uncertainty that can be capitalized into house prices. The loss of age-restricted status in Youngtown, which increased uncertainty about the future, resulted in the elimination of the premium over approximately twelve to eighteen months even though essentially the same facilities and services continued to be available. The legal determination that Youngtown?s age restriction ordinance was invalid and could not be enforced had an immediate but temporary negative impact on house prices.