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 ...

Artist's impression of the geometry of the accretion disk around the young star and the outflowing rotating disk wind. Regions of the disk wind that are moving toward us appear blue-shifted and are ...

This course introduces the quantum mechanical concept of angular momentum operator and its relationship with rotation operator. It then presents the angular momentum operators, their eigenvalues and ...