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Latest profile posts

A
Greg-

This is an excellent piece on the CHSH inequality violations. Bell's analysis, in conjunction with the Clauser-Aspect experiments, make it clear that local realism is untenable, and that Nature must effect some kind of superluminal global coordination. Gell-Mann was famously unsurprised (It only proves what we've known all along - that quantum mechanics is correct. Big deal.) But I think that Gell-Mann was dead wrong not to be surprised. What is your position?
berkeman
berkeman
Why are you asking Greg about this? He is the owner of PF, not one of our Science Advisors. You did not quote the text that you were asking about -- was it from an Insights article that Greg posted on behalf of a Science Advisor author?
S
Hi . I read in class 7 from Bangladesh and I secured 1st place in Bangladesh physics Olympiad (BdPhO) in category A
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.Scott
Science Advisor
Homework Helper
I was posting a response to you when that thread closed. Here it is (500 characters at a time):
If that is a philosophical definition, as you claim, then what is the physics or physical sciences definition?
Amazed said:
I am not presuming any so-called perfect information at all. I am also not sticking to that definition at all. Why did you presume that I am not seeing the difference between a philosophical discussion and a scientific one?
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.Scott
.Scott
Amazed said:
you appear to be taking my open questions, always asked from an open perspective, completely off track and off topic. Physics and deals with what is measurable and what is observable. So, what is the agreed upon and accepted word or term here for 'that', which all matter, space, and energy considered to be as a whole can or could be observed and measured? If the word and term 'Universe' does not suffice, then what word or term does?
.Scott
.Scott
It really depends on what you are trying to measure, observe, or analyze. As you may have noticed in the Einstein example above, you get to improvise. In general, a Physicist will look at the experimental results, perhaps find some patterns, and form some ideas. Then they will find a way to communicate those ideas. So it's the subject matter that precedes the definition.
.Scott
.Scott
There are terms that are pretty fixed. For example, if you talk about a "Newtonian universe", most will immediate envision a 3D Cartesian coordinate system with Euclidean geometry and very simple and deterministic physics. You can say "Schwarzschild black hole" and every knows that's the model you get with General Relativity and no angular momentum. Those terms have very specified stories behind them. "Universe" isn't one of them.
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