The flyby anomaly: a multivariate analysis approach

[EN] The flyby anomaly is the unexpected variation of the asymptotic post-encounter velocity of a spacecraft with respect to the pre-encounter velocity as it performs a slingshot manoeuvre. This effect has been detected in, at least, six flybys of the Earth but it has not appeared in other recent flybys. In order to find a pattern in these, apparently contradictory, data several phenomenological formulas have been proposed but all have failed to predict a new result in agreement with the observations. In this paper we use a multivariate dimensional analysis approach to propose a fitting of the data in terms of the local parameters at perigee, as it would occur if this anomaly comes from an unknown fifth force with latitude dependence. Under this assumption, we estimate the range of this force around 300 km .Acedo Rodríguez, L. (2017). The flyby anomaly: a multivariate analysis approach. Astrophysics and Space Science. 362(2):1-7. doi:10.1007/s10509-017-3025-zS173622Acedo, L.: Adv. 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Retirement Replacement Rates and Retirement Wealth Inequality Among Baby Boomer and Other Birth Cohorts

The retirement readiness of baby boomers has been a topic of considerable but inconclusive research. Using data from the Panel Study of Income Dynamics (PSID), the authors evaluate the relative retirement readiness of five discrete birth cohorts: Depression babies (born 1926–1935); World War II babies (born 1936–1945); two halves of the baby boom generation (older, born 1946–1955, and younger, born 1956–1965); and Gen-Xers (born 1966–1975). They construct a comprehensive measure of retirement wealth that combines both accumulated private net worth and the annuity values of Social Security and defined-benefit pensions at age 65. The authors then calculate replacement rates as the ratio of annuitized wealth at age 65 to average preretirement income. They find that median replacement rates decline steadily over the four birth cohorts from World War II babies to Gen-Xers and that younger generations appear to be considerably less well situated for retirement than baby boomers and earlier cohorts. By comparing ratios of replacement rates at the 99th and 50th percentile, the authors determine that retirement wealth inequality in the top half of the wealth distribution increases steadily across the five birth cohorts, reaching a peak among Gen-Xers