Gravity has always been quantum mechanical: it is the wrong thing to quantise

Discussion (4 Comments)Read Original on HackerNews

icodestuff•about 3 hours ago

I'm not much of a physicist, but this rates a 9.5/10 on my personal BS mater. A single citation, two lines of analytical mathematics, a promise to resolve the Hubble tension without actually doing so quantitatively (or indeed, even conceptually), and I'm pretty certain (> 99%) that the no-hair theorem applies specifically to black holes, not other massive objects.

I know a little bit more about orbital mechanics, and I know that the internal structure of a planet matters for the stability of an orbit. While at larger distances the effect becomes small enough to ignore, it never really goes away. Whereas a black hole is indeed thought to behave like a point mass.

danieltanfh95•about 1 hour ago

This was planned as a submission to the Gravity Research Foundation for 2027.

The Dirac Spinor equation is extremely standard, and GR would be the more famous one. The only "leap of faith" here is having the metric to be the functional of the matter wave, and not just the stress-energy tensor (which is the mainstream semi-classical approach).

Simply sharing here to prove authorship + sharing something interesting to HN.

edit: Though I note that I should have quoted Birkhoff's theorem instead, thanks for the pointer.

gus_massa•about 2 hours ago

> (> 99%)

Yep, 100% it only applies to black holes (after enough time, so they can radiate the weird parts, but this time is short in human scale)

chermi•about 2 hours ago

This is why he needs a down vote button

Gravity has always been quantum mechanical: it is the wrong thing to quantise

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Discussion (4 Comments)Read Original on HackerNews