3 ms·

> nobody has a clue The "arrow of time" is commonly explained as an effect of thermodynamics, i.e. increasing entropy. I always felt this to be a deeply unsat

• fpoling 7y ago
  Arrow of time explained via thermodynamics is a circular explanation. Thermodynamics follows from equation of motions or field equations. In those the time is different from space in that from conditions across 3 space coordinates at particular moment in time one can deduce conditions across the whole time (except black hole and other singularities). But from boundary conditions across two space coordinates and across the whole time one cannot fill the conditions along remaining space coordinate. But those equations just reflects experimental observations. So arrow of time exists because we observe arrow of time...