In the name of the Father: marriage and intergenerational mobility in the United States, 1850-1930

This paper constructs a continuous and consistent measure of intergenerational mobility in the United States between 1850 and 1930 by linking individuals with the same first name across pairs of decennial Censuses. One of the advantages of this methodology is that it allows to calculate intergenerational correlations not only between fathers and sons, but also between fathers-in-law and sons-in-law, something that is typically not possible with historical data. Thus, the paper sheds light on the role of marriage in the intergenerational transmis- sion of economic status from a historical perspective. We find that the father-son correlation in economic status grows throughout the period, but is consistently lower than the correlation between fathers-in-law and sons-in-law. The gap declines over time, and seems to have closed by the end of the period. We present a simple model of investment in human capital, marital sorting and intergenerational mobility that can rationalize the ?ndings

In the name of the son (and the daughter): intergenerational mobility in the United States, 1850-1940

This paper estimates historical intergenerational elasticities between fathers and children of both sexes in the United States using a novel empirical strategy. The key insight of our approach is that the information about socioeconomic status conveyed by first names can be used to create pseudo-links across generations. We find that both father-son and father-daughter elasticities were flat during the nineteenth century, increased sharply between 1900 and 1920, and declined slightly thereafter. We discuss the role of regional disparities in economic development, trends in inequality and returns to human capital, and the marriage market in explaining these patterns

Three-generation mobility in the United States, 1850-1940: the role of maternal and paternal grandparents

This paper estimates intergenerational elasticities across three generations in the United States in the late 19th and early 20th centuries, exploring how maternal and paternal grandfathers predict the economic status of their grandsons and granddaughters. We document that the relationship between the income of grandparents and grandchildren differs by gender. The socio-economic status of grandsons is more strongly associated with the status of paternal grandfathers than maternal grandfathers. The status of maternal grandfathers is more strongly correlated with the status of granddaughters than grandsons, while the opposite is true for paternal grandfathers. We argue that the findings can be rationalized by a model of gender-specific intergenerational transmission of traits and imperfect assortative mating.Accepted manuscrip

Breathing mode for systems of interacting particles

We study the breathing mode in systems of trapped interacting particles. Our approach, based on a dynamical ansatz in the first equation of the Bogolyubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy allows us to tackle at once a wide range of power law interactions and interaction strengths, at linear and non linear levels. This both puts in a common framework various results scattered in the literature, and by widely generalizing these, emphasizes universal characters of this breathing mode. Our findings are supported by direct numerical simulations.Comment: 4 pages, 4 figure

Wigner crystal versus Fermionization for one-dimensional Hubbard models with and without long-range interactions

The ground state properties of Hubbard model with or without long-range interactions in the regime with strongly repulsive on-site interaction are investigated by means of the exact diagonalization method. We show that the appearance of $N$-crests in the density profile of a trapped N-fermion system is a natural result of "fermionization" between antiparallel-spin fermions in the strongly repulsive limit and can not be taken as the only signature of Wigner crystal phase, as the static structure factor does not show any signature of crystallization. On the contrary, both the density distribution and static structure factor of Hubbard model with strong long-range interactions display clear signature of Wigner crystal. Our results indicate the important role of long-range interaction in the formation of Wigner crystal.Comment: 7 pages, 7 figure

BiDAl: Big Data Analyzer for Cluster Traces

Modern data centers that provide Internet-scale services are stadium-size structures housing tens of thousands of heterogeneous devices (server clusters, networking equipment, power and cooling infrastructures) that must operate continuously and reliably. As part of their operation, these devices produce large amounts of data in the form of event and error logs that are essential not only for identifying problems but also for improving data center efficiency and management. These activities employ data analytics and often exploit hidden statistical patterns and correlations among different factors present in the data. Uncovering these patterns and correlations is challenging due to the sheer volume of data to be analyzed. This paper presents BiDAl, a prototype “log-data analysis framework” that incorporates various Big Data technologies to simplify the analysis of data traces from large clusters. BiDAl is written in Java with a modular and extensible architecture so that different storage backends (currently, HDFS and SQLite are supported), as well as different analysis languages (current implementation supports SQL, R and Hadoop MapReduce) can be easily selected as appropriate. We present the design of BiDAl and describe our experience using it to analyze several public traces of Google data clusters for building a simulation model capable of reproducing observed behavior

Long-range gravitational-like interaction in a neutral atomic cold gas

A quasi-resonant laser induces a long-range attractive force within a cloud of cold atoms. We take advantage of this force to build in the laboratory a system of particles with a one-dimensional gravitational-like interaction, at a fluid level of modeling. We give experimental evidences of such an interaction in a cold Strontium gas, studying the density profile of the cloud, its size as a function of the number of atoms, and its breathing oscillations.Comment: 4 pages, 4 figures. Published in PRA 87, 013401 (2013

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