f(R) theories

Over the past decade, f(R) theories have been extensively studied as one of the simplest modifications to General Relativity. In this article we review various applications of f(R) theories to cosmology and gravity - such as inflation, dark energy, local gravity constraints, cosmological perturbations, and spherically symmetric solutions in weak and strong gravitational backgrounds. We present a number of ways to distinguish those theories from General Relativity observationally and experimentally. We also discuss the extension to other modified gravity theories such as Brans-Dicke theory and Gauss-Bonnet gravity, and address models that can satisfy both cosmological and local gravity constraints.Comment: 156 pages, 14 figures, Invited review article in Living Reviews in Relativity, Published version, Comments are welcom

Prenatal Stress and Infant Temperament

For many parents-to-be, pregnancy is an exciting and joyful time. However, it can also be a stressful time, whether stress is a preexisting issue that precedes pregnancy or comes from uncertainty and anxiety surrounding childbirth and child-rearing. Past research showed that prenatal stress and anxiety, particularly that of expectant mothers, can have adverse effects on infant temperament. Stressors during pregnancy are not only mothers’ (or parents’) psychological issues but also external factors such as teratogens (e.g., cigarettes, alcohol, drugs) that create a toxic prenatal environment for a developing fetus, which in turn creates long-lasting consequences for the offspring.https://nsuworks.nova.edu/cps_facbooks/1606/thumbnail.jp