Many theories of dark energy predict a time-varying dark energy
density, in stark contrast to Einstein’s cosmological constant.
Earlier this year, we saw the first hints of an observational
preference for such dynamical theories. In this talk, I...
Abstract: Some of the most fascinating
phenomena in nature arise when electrons behave as quantum
mechanical waves that interact with one another. But how can we
visualize these electronic waves in action? In this talk, I will
introduce the Quantum...
Frequent dynamical encounters in globular clusters significantly
enhance the production of multi-messenger phenomena. It is now well
established that globular clusters host robust populations of
compact objects, including low-mass X-ray binaries...
A large fraction of exoplanetary systems contain planets that
orbit very close to their host stars. With orbital periods in the
range of days to weeks, tidal forces become important and lead to
significant orbital and physical effects on the planets...
After the first waves of gravitational-wave detections, it often
seems as though we are left with more questions than answers. The
hope of finding "one formation channel to rule them all" has given
way to "one channel for every system."
In this talk I will do three things. First, I will outline the
conditions under which the interaction rate of inelastic
processes with a system consisting of N targets scales as N^2.
Second, I will present computations of interaction rates for...
Star formation proceeds in our Galaxy in a way that is not so
easily understood. Giant molecular clouds (GMCs) outweigh the most
massive star clusters by orders of magnitude - star formation is
inefficient. The mass spectrum of young stars - the IMF...
Though the solar wind is characterized by spatial and temporal
variability across a wide range of scales, long-term averages of
in-situ measurements have revealed clear radial trends: changes in
average values of basic plasma parameters (e.g...
