Surprising as it may sound, 107 years after the introduction of general relativity, the meanings of basic concepts are still being worked out. More than a century after Albert Einstein unveiled ...

Introduction You might have seen figure skaters spinning around quickly and then tucking their arms to spin faster—or opening them to spin more slowly. This happens, thanks to a physics concept known ...

The roles of energy, momentum and orbital angular momentum conservation in high-harmonic generation were studied in the past. Here, we explore the role of spin angular momentum in high-harmonic ...

The inner solar system spins much more slowly than the laws of modern physics predict, and a new study may help to explain why. A thin disk of gas and dust — known as an accretion disk — spirals ...

One of the most important, powerful and beautiful ideas in modern physics is Noether’s theorem. This essentially says that the fundamental laws of physics are a manifestations of symmetry in the ...

Figure 1: The wave front (top) and the intensity pattern (bottom) of the simplest Laguerre–gaussian (LG l p) or ‘doughnut’ mode. It is only by using a coincidence measurement that we could show that ...