Comment by Y_Y

Comment by Y_Y 3 days ago

9 replies

A thing of beauty is a joy forever - John Keats

Honestly, physics is so full of pretension and hero worship. Even among seasoned lecturers there's a tendency to mythologise the progress of the art by making it sound like all the great results we rely on were birthed fully-formed by the giants who kindly lend us their divine shoulders.

Ironically there's a kind of Gell-Mann amnesia here, working scientists know that must of your work will consist of stumbling down blind alleys in the dark and looking for needles under lampposts that aren't even near the haystack.

I'm reminded of an anecdote which I can't currently source, but as I remember it Hilbert was trying to derive the Einstein Field Equations by a variational method. He correctly took the Ricci curvature R as the Lagrangian, but then neglected to multiply by the tensor density, sqrt(-g). This is kind of a rookie mistake, but made by one of the history's greatest mathematical physicists.

Anyway I love this article, it's a breath of fresh air and rightly beloved by undergrads.

(edit: for a counterpoint to this work please see another classic: "The physics is the life" -http://i.imgur.com/eQuqp.png )

russdill 3 days ago

There's a single instance in Einstein's notebooks where he attempts to use numerical methods to come up with a result. He manually graphs some result of the cosmological constant and then integrates it by counting the squares under the curve.

  • emmelaich 3 days ago

    An esteemed emeritus professor of engineering I know used to cut out the graph and weigh it on a sensitive scale to integrate. It was not an uncommon technique.

  • mr_mitm 3 days ago

    I find that hard to imagine, considering we're talking about coupled partial differential equations in four dimensions. Well, if that's true, it really goes to show his desperation, I guess.

api 3 days ago

Just physics is like this? Hero worship like this is pretty endemic.

It’s weird because on one hand it promotes this disempowering mythology that all progress comes from a vanishingly tiny fraction of humanity, but on the other hand people find it inspiring because if heroes exist then it means people (and maybe you!) can do amazing things. It’s a weird double edged sword.

  • Y_Y 3 days ago

    Fwiw I certainly didn't mean to say this is unique to physics, I'm just not qualified to comment on other fields. Furthermore you make a good point, the hero worship is fruitful. Anecdotally I'd say a full third of my undergrad cohort cited Feynman's auto-hagiography as part of their decision to study physics.

    (I also note that any double-edged polyhedral sword is necessarily degenerate.)

mr_mitm 3 days ago

There seems to be a bit of confusion about the Hilbert-Einstein controversy [1], and I believe consensus is that Hilbert derived the equations a few days before Einstein, but did not claim ownership of the research. But this is the first time I'm hearing that Hilbert made a mistake. (I mean, maybe he did, but he got the right result eventually.)

[1] https://physics.stackexchange.com/questions/56892/did-hilber...

ajkjk 3 days ago

I feel like forgetting to multiply by sqrt(-g) must have been a pretty easy mistake to make back then. This stuff was new!

zyklu5 3 days ago

On the contrary, what is presented by the OP is one of the many reasons that worship of science's heroes, unfashionable for decades, a whiggish pablum, is justified. If great results were birthed fully-formed -- a view I've frankly never heard anyone profess who has bothered to consider such things even briefly -- they would hardly be any heroes. Even little children who reflexively chomp on every superhero film aeroplaned towards their face understand this.