RISC Colloquium

Time is one of the fundamental concepts in all branches of physics. A closer investigation shows, it is a rather subtle quantity at the same time.  Although mathematically often united with space, it seems to have the property of a thorough direction. Another question, which is even more difficult to answer, e.g. for microcosmic situations, is: how can time be measured.  After an introduction to the topic the talk analyzes whether and why time runs always forward. We cover all areas of physics: classical physics, electrodynamics, statistical physics, quantum physics, general relativity and cosmology w.r.t. their relation to the arrow of time and its mathematical implementation.