Sinopsis
What I want to talk about here is a certain tension between fundamental microscopic physical theory and everyday macroscopic human experience, a tension that comes up (more particularly) in connection with the question of precisely how the past is different from the future.
And the fundamental theory in which it will work best to start that talk out, the fundamental theory (that is) in which this tension is at its purest and most straightforward, is the mechanics of Newton. Never mind (for the moment) that the mechanics of Newton turns out not to be the mechanics of the actual world.1 We’ll talk about that later.
▲▲▲ According to Newtonian mechanics, or at any rate according to the particularly clean and simple version of it that I want to start off with here, the physical furniture of the universe consists entirely of point particles. The only dynamical variables of such particles—the only physical attributes of such particles that can change with time—are (on this theory) their positions; and (consequently) a list of what particles exist, and of what sorts of particles they are,2 and of what their positions are at all times, is a list of absolutely everything there is to say about the physical history of the world.3
Content
- Time-Reversal Invariance
- Thermodynamics
- Statistical Mechanics
- The Reversibility Objections and the Past-Hypothesis
- The Scope of Thermodynamics
- The Asymmetries of Knowledge and Intervention
- Quantum Mechanics
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