Friday, June 15, 2012

Following wrong relativity lessons

When physicists promote some abstract untestable theory like string theory or quantum gravity, they often claim to be following Einstein's example, and sometimes claim more specifically that they are following the history of special relativity. Here is a an example, from a few days ago.

Quantum gravity physicist Carlo Rovelli writes an essay:
The prototype of this way of thinking, I think the example that makes it more clear, is Einstein's discovery of special relativity. On the one hand there was Newtonian mechanics, which was extremely successful with its empirical content. On the other hand there was Maxwell's theory, with its empirical content, which was extremely successful, too. But there was a contradiction between the two.

If Einstein had gone to school to learn what science is, if he had read Kuhn, and the philosopher explaining what science is, if he was any one of my colleagues today who are looking for a solution of the big problem of physics today, what would he do?

He would say, okay, the empirical content is the strong part of the theory. The idea in classical mechanics that velocity is relative: forget about it. The Maxwell equations, forget about them. Because this is a volatile part of our knowledge. The theories themselves have to be changed, okay? What we keep solid is the data, and we modify the theory so that it makes sense coherently, and coherently with the data.

That's not at all what Einstein does. Einstein does the contrary. He takes the theories very seriously. He believes the theory. He says, look, classical mechanics is so successful that when it says that velocity is relative, we should take it seriously, and we should believe it. And the Maxwell equations are so successful that we should believe the Maxwell equations. He has so much trust in the theory itself, in the qualitative content of the theory, that qualitative content that Kuhn says changes all the time, that we learned not to take too seriously, and so much faith in this, confidence in that, that he's ready to do what? To force coherence between these two, the two theories, by challenging something completely different, which is something that is in our head, which is how we think about time.
This is all nonsense, as Einstein was not the one to discover special relativity. I exaplain it in my book, How Einstein Ruined Physics.

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