The United States and eight other countries that possess nuclear weapons run myriad risks every day -- risks of accidental detonations, of unauthorized launches caused by false warning, of provoking escalation between nuclear forces, and of nuclear weapons falling into the hands of terrorists.
The PPPL function that reaches out to students, teachers and the general public through programs ranging from student internships to weekly talks on scientific topics from January through April.
In principle, evolution can take a nearly unlimited number of possible paths. Using laboratory experimental evolution, we can run the same evolutionary experiment in hundreds of parallel populations. We observe that each population finds a unique genotypic solution. Yet, in these data, phenotypic patterns emerge suggesting that there are a limited number of accessible pathways to substantially higher fitness. Therefore, despite the inherent randomness of genotypic evolution, phenotypic evolution is strongly constrained, and perhaps even predictable.
Models of the global terrestrial biosphere in current Earth system models (climate models with coupled atmosphere, ocean and biosphere) uniformly predict a large current carbon sink caused by CO2 fertilization of terrestrial vegetation that sequesters 1-2 GtC/y. Models with a nitrogen cycle generally predict that a large fraction of the sink will disappear by midcentury because of nitrogen limitation. The models all include some form of Liebig’s Law of the Minimum for nitrogen. All models currently predict that water limited systems will see large and sustained sinks because water use e
We now know more than one thousand extrasolar planets (exoplanets), and another two thousand exoplanet candidates. Many of the best understood ones are so-called transiting exoplanets, and many were discovered by small telescopes. I will review two currently running small telescopes projects (HATNet and HATSouth) that have altogether yielded 60 exoplanets. I will highlight some of the discoveries and recent scientific results from these projects.
Quantum mechanics is important for determining the geometry of spacetime. We will review the role of quantum fluctuations that determine the large scale structure of the universe. In some model universes we can give an alternative description of the physics in terms of a theory of particles that lives on its boundary. This implies that the geometry is an emergent property. Furthermore, entanglement plays a crucial role in the emergence of geometry.
Science fans of all ages can explore a rich variety of science and technology topics at the popular Science on Saturday lecture series hosted by the U.S. Department of Energy’s Princeton Plasma Physics Laboratory. The series marks its 30-year anniversary when it begins on Saturday, Jan. 11.
Science on Saturday offers free lectures about current topics from “The physics of cancer,” to “What art can tell us about the brain,” that are aimed at the general public from high school age and up.
A private, independent academic institution in Princeton, New Jersey, the Institute for Advanced Study is one of the world's leading centers for theoretical research and intellectual inquiry. Founded in 1930, it exists to encourage and support curiosity-driven research in the sciences and humanities. Diverse scholars including Albert Einstein, Erwin Panofsky, John von Neumann, J.
COLLOQUIUM RE-SCHEDULED FROM JAN. 22 TO JAN 28
When fossil fuel CO2 is released to the atmosphere, it essentially accumulates in the relatively rapidly cycling atmosphere / ocean / land biosphere carbon cycle. The atmospheric concentration of CO2 spikes through a time period of CO2 emissions, then is expected to slowly decline over the centuries as CO2 invades the ocean. The “lifetime” of fossil fuel CO2 in the atmosphere is a complicated question because there are multiple processes operating, but in general the CO2 concentration will be higher than natural for hundreds of thousands of years.