We characterise the population of wandering black holes, defined as those physically offset from their halo centres, in Romulus cosmological simulations. Unlike most other currently available simulations, holes are seeded based on local gas properties and permitted to evolve dynamically without being fixed at centres. Tracking these allows us make robust predictions about population. find that ...

Laura Paszkiewicz is an economist in the Branch of Information Analysis, Division of Consumer Expenditure Surveys, Bureau of Labor Statistics. Transportation costs make up a large part of a consumer’s budget. Consumer Expenditure (CE) Survey data for 2000 indicate that 88 percent of all consumer units1 either owned or leased a vehicle,2 and expenditures for leasing and purchasing (the latter de...

Since the advent of the all-volunteer force in the 1970s, marriage, parenthood, and family life have become commonplace in the U.S. military among enlisted personnel and officers alike, and military spouses and children now outnumber service members by a ratio of 1.4 to 1. Reviewing data from the government and from academic and nonacademic research, Molly Clever and David R. Segal find several...

Understanding the contributions of vital rates to species population growth is critical to developing new management protocols. We constructed a model population for black vultures (Coragyps atratus) in North Carolina, USA, based on demographic data from a 14-year study. The model population was similar in stage structure to the reference population, and adult survival was the primary contribut...

The absolute magnitude and perihelion distributions of long-period comets are derived, using data from the Lincoln Near-Earth Asteroid Research (LINEAR) survey. The results are surprising in three ways. Firstly, the flux of comets through the inner solar system is much lower than some previous estimates. Secondly, the expected rise in comet numbers to larger perihelia is not seen. Thirdly, the ...

We study asset-pricing implications of innovation in a general-equilibrium overlappinggenerations economy. Innovation increases the competitive pressure on existing firms and workers, reducing the profits of existing firms and eroding the human capital of older workers. Due to the lack of inter-generational risk sharing, innovation creates a systematic risk factor, which we call “displacement r...