I picked up a book at a local library; its name was The Arrows of Time. I did not read the whole book, but a chapter describing the five arrows of time caught my attention. This is because people usually only discuss one such arrow. If I remember correctly, they were described as:
1) Thermodynamic arrow - entropy, etc.
2) Electromagnetic arrow - waves propagate forward in time
3) Expansion of the universe - it seems to go only one way
4) K meson - rare decay into 2 particles instead of 3 (CP symmetry violation)
5) Psychological arrow - our perception of linear forward time
1) Thermodynamic arrow - entropy, etc.
2) Electromagnetic arrow - waves propagate forward in time
3) Expansion of the universe - it seems to go only one way
4) K meson - rare decay into 2 particles instead of 3 (CP symmetry violation)
5) Psychological arrow - our perception of linear forward time
