In the wake of the quantum measurement problem there is a constellation of competing theories of quantum mechanics. Any adequate solution to the measurement problem must make predictions that agree with the observed quantum statistics. In particular, the theory must explain why small particles exhibit counter-intuitive behaviour and why this seems to go away at… Continue reading Paper Review: Unified dynamics for microscopic and macroscopic systems

# Tag: physics

## Paper Review: Subject and Object

One way to think about the quantum measurement is to think about the conflict between subjective and objective probability. We looked at some of Everett's earlier thoughts along these lines last week. As I mentioned in that post, later on in one version of his thesis he provided a much cleaner account of the measurement… Continue reading Paper Review: Subject and Object

## Paper Review: Objective versus Subjective Probability

Hugh Everett III proposed his many worlds (or as he preferred to call it, relative state) formulation of quantum mechanics back in the mid 50s in order to solve the quantum measurement problem. Although it took a while for the theory to gain traction, it (or some form of it) is one of the more… Continue reading Paper Review: Objective versus Subjective Probability

## Paper Review: The measurement theory of Everett and de Broglie’s pilot wave

I've written before on this blog about quantum mechanics. We've looked at a questionable interpretation of a recent experiment, the way in which quantum mechanics is radically nonlocal, and certain theoretical constructs needed for the thought experiments used in physics. One of the main reasons why quantum physics fascinates people is because the phenomenon themselves… Continue reading Paper Review: The measurement theory of Everett and de Broglie’s pilot wave

## Paper Review: The Paradoxes of Time Travel

We've all heard of the classic grandfather paradox of time travel: you go back in time and kill your grandfather before he sired your father. But then what happens? We can reason about it in something like the following way. You kill your grandfather, so your father never existed, so you never existed. But then… Continue reading Paper Review: The Paradoxes of Time Travel

## Paper Review: Bell’s Theorem: The Price of Locality

Quantum phenomena--and the theories built to account for them--can be strange. One of the most fundamental and (to some), spooky, things about quantum mechanics is action at a distance. What exactly is action at a distance in quantum mechanics, and what are its implications? This is one of the central questions of Tim Maudlin's book… Continue reading Paper Review: Bell’s Theorem: The Price of Locality

## Paper Review: Free Variables and Local Causality

When can we treat certain experimental parameters as free variables? Consider trying to figure out whether or not a certain drug is efficacious. We design an experiment that proceeds as follow: Break a collection of experimental subjects up into two groups randomly.To one of the groups give the drug, and to the other give a… Continue reading Paper Review: Free Variables and Local Causality