I will discuss how the theories with extra dimensions can be probed with the cosmological fluctuations generated by inflation in the braneworld setting. I also will talk about recent results in the theory of preheating after inflation. The epic confrontation of low energy, high precision measurements with the theories of the highest energy frontiers, is an interesting theme in modern physics. Interesting, new high precision experiments on muonium and the anomalous magnetic moment of the muon are described, and the results compared with the predictions of the standard model and its extensions. On a sunny breezy day, sharp lines of light dance on the bottom of a swimming pool.
Caustics also arise naturally in the distribution of dark matter in space.
The dark matter density is very large at the location of a caustic. I'll show that the late infall of cold dark matter onto isolated galaxies, such as our own, produces discrete flows of dark matter throughout the galactic halo and associated caustics. One set of caustics are topological spheres surrounding the galaxy. Another set are rings in the galactic plane. There is evidence for these rings in the distribution of bumps in the rotation curves of spiral galaxies.