757 research outputs found

    Keeping “I Do” Between Two: A Post-Obergefell Analysis of a Bigamous Marriage and Its Implications for Louisiana’s Matrimonial Regime

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    The article focuses on the U.S. expansion of individual rights and liberties and the significant ambiguities surrounding the Supreme Court\u27s interpretation of the Due Process and Equal Protection clauses of the Fourteenth Amendment and constitutional analysis of Louisiana\u27s criminal bigamy statute

    Self Calibration of Tomographic Weak Lensing for the Physics of Baryons to Constrain Dark Energy

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    Numerical studies indicate that uncertainties in the treatment of baryonic physics can affect predictions for shear power spectra at a level that is significant for forthcoming surveys such as DES, SNAP, and LSST. Correspondingly, we show that baryonic effects can significantly bias dark energy parameter measurements. Eliminating such biases by neglecting information in multipoles beyond several hundred leads to weaker parameter constraints by a factor of approximately 2 to 3 compared with using information out to multipoles of several thousand. Fortunately, the same numerical studies that explore the influence of baryons indicate that they primarily affect power spectra by altering halo structure through the relation between halo mass and mean effective halo concentration. We explore the ability of future weak lensing surveys to constrain both the internal structures of halos and the properties of the dark energy simultaneously as a first step toward self calibrating for the physics of baryons. This greatly reduces parameter biases and no parameter constraint is degraded by more than 40% in the case of LSST or 30% in the cases of SNAP or DES. Modest prior knowledge of the halo concentration relation greatly improves even these forecasts. Additionally, we find that these surveys can constrain effective halo concentrations near m~10^14 Msun/h and z~0.2 to better than 10% with shear power spectra alone. These results suggest that inferring dark energy parameters with measurements of shear power spectra can be made robust to baryonic effects and may simultaneously be competitive with other methods to inform models of galaxy formation. (Abridged)Comment: 18 pages, 11 figures. Minor changes reflecting referee's comments. Results and conclusions unchanged. Accepted for publication in Physical Review

    Groups of two galaxies in SDSS: implications of colours on star formation quenching time-scales

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    We have devised a method to select galaxies that are isolated in their dark matter halo (N=1 systems) and galaxies that reside in a group of exactly two (N=2 systems). Our N=2 systems are widely-separated (up to \sim\,200\,h1h^{-1}\,kpc), where close galaxy-galaxy interactions are not dominant. We apply our selection criteria to two volume-limited samples of galaxies from SDSS DR6 with Mr5log10hM_{r}-5 \log_{10} h \leq -19 and -20 to study the effects of the environment of very sparse groups on galaxy colour. For satellite galaxies in a group of two, we find a red excess attributed to star formation quenching of 0.15\,±\pm\,0.01 and 0.14\,±\pm\,0.01 for the -19 and -20 samples, respectively, relative to isolated galaxies of the same stellar mass. Assuming N=1 systems are the progenitors of N=2 systems, an immediate-rapid star formation quenching scenario is inconsistent with these observations. A delayed-then-rapid star formation quenching scenario with a delay time of 3.3 and 3.7\,Gyr for the -19 and -20 samples, respectively, yields a red excess prediction in agreement with the observations. The observations also reveal that central galaxies in a group of two have a slight blue excess of 0.06\,±\pm\,0.02 and 0.02\,±\pm\,0.01 for the -19 and -20 samples, respectively, relative to N=1 populations of the same stellar mass. Our results demonstrate that even the environment of very sparse groups of luminous galaxies influence galaxy evolution and in-depth studies of these simple systems are an essential step towards understanding galaxy evolution in general.Comment: 17 pages, 11 figures, accepted to MNRA

    The Black Death and Its Impact on the Church and Popular Religion

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    This thesis concerns the religious impact of the Black Death, the plague that devastated Europe during the middle of the fourteenth century. It explores the effect of the Black Death on the Catholic Church and the religious movements that emerged in response to it. The conclusions drawn here are based on the research of both primary and secondary sources. The Church played a significant role during the Middle Ages because religion was an important aspect of daily life for European Christians. When the Black Death struck Europe in 1347, the Church struggled to cope with the plague’s damaging consequences and its reputation suffered as a result. This thesis concludes that the Black Death contributed to the decline in the confidence and faith of the Christian laity towards the institution of the Church and its leadership. The scope of this paper focuses on the plague’s impact on the clergy, the rise of the flagellant movement, and the widespread Jewish persecutions that ensued in the wake of the plague. The Black Death was a significant event in the history of Western society with profound cultural and demographic consequences, and its impact on the Church and religion in medieval society justifies the study of this topic
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