@article{ref1,
title="Memory-endowed US cities and their demographic interactions",
journal="Journal of the Royal Society, Interface",
year="2015",
author="Hernando, A. and Hernando, R. and Plastino, A. and Zambrano, E.",
volume="12",
number="102",
pages="e20141185-e20141185",
abstract="A quantitative understanding of cities' demographic dynamics is becoming a potentially useful tool for planning sustainable growth. The concomitant theory should reveal details of the cities' past and also of its interaction with nearby urban conglomerates for providing a reasonably complete picture. Using the exhaustive database of the Census Bureau in a time window of 170 years, we exhibit here empirical evidence for time and space correlations in the demographic dynamics of US counties, with a characteristic memory time of 25 years and typical distances of interaction of 200 km. These correlations are much larger than those observed in a European country (Spain), indicating more coherent evolution in US cities. We also measure the resilience of US cities to historical events, finding a demographical post-traumatic amnesia after wars (such as the American Civil War) or economic crisis (such as the 1929 Stock Market Crash).<p /> <p>Language: en</p>",
language="en",
issn="1742-5689",
doi="10.1098/rsif.2014.1185",
url="http://dx.doi.org/10.1098/rsif.2014.1185"
}