Search found 4 matches

by Jim
Tue Jan 09, 2018 3:08 am
Forum: Gravitational Physics Discussion
Topic: Relativity and Energy
Replies: 1
Views: 644

Relativity and Energy

There's an old example I've talked about elsewhere, a thought experiment I remember first hearing from Feynman, but it shows up in Modern Physics books as a simple problem as well, is one where you have two identical particles moving at equal speeds towards one another in your reference frame, event...
by Jim
Tue Jan 09, 2018 12:11 am
Forum: Quantum Physics Discussion
Topic: Lack of Time
Replies: 2
Views: 1304

Re: Lack of Time

I've seen a lot of proofs like that. I recently decided to work through Sakurai's Modern Quantum Mechanics over the break -- funny story, I'll put it up in the review post on the blog when I finish it -- but he gives yet another such proof at the start of Chapter 2, "Quantum Dynamics." In this case,...
by Jim
Thu Dec 07, 2017 10:11 pm
Forum: Quantum Physics Discussion
Topic: Lack of Time
Replies: 2
Views: 1304

Lack of Time

In quantum mechanics, there is no time operator. Time, they say, is a parameter, not an observable. There is, therefore, no time operator. This means that in the quantum theory of measurement, where every observable is associated with an operator, time cannot be measured. This also produces problems...
by Jim
Fri Nov 24, 2017 7:48 pm
Forum: PFM10 - Intermission: Quantum Metaphysics
Topic: All paths lead to ruin
Replies: 3
Views: 955

Re: All paths lead to ruin

It should only offend people who hold tightly to beliefs they can only defend more vehemently than rigorously.

That is an awful sentence.

I'd ask if we want to attract those people or not, but I don't think you get a choice.

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