I think the only thing that stops this from becoming true is what Chinese and European labs decide to do. If they can keep up and keep opening their weights, then we might see some kind of democratization. But right now it looks like the gap has increased, and those groups can't replicate research that isn't published, or distill models that are internal only, or for select (very wealthy) customers.
It’s pretty crazy what dynamics you get from NS.. until one realise they emerge from a tiny part of the solution space of Einstein equations.. which themselves emerge at the low energy limit of sth much bigger.
Can you actually credibly find NS or even Euler’s equations as an effective theory from GR?
Euler’s equations and NS have this pesky velocity field, which requires the fluid’s state to be well described by a velocity at each point in space (and a density and a pressure, but I think GR has no problem with those). This means that you need some kind of interaction between particles to get them to exchange energy so that they thermalize instead of staying in the collisionless regime. (In other words, if you have two blobs of fluid collide, you need them to not go right through each other.) And I don’t think that GR is dissipating on the relevant scales.
As a real-world example, the universe contains neat structures (the horsehead nebula is a somewhat famous example) that are consistent with dark matter distributions that don’t really resemble fluids.
Ps: your comment on dissipation is good. But in certain frames GR can reproduce that. I’m far from an expert, but definition of energy is rly hard in GR (need both Noether thms).
Research on the topic seems to have stalled a decade ago. Probably for a good reason.
but you might need to understand it in the context of holography
in some frame you can recover non-relativistic symmetries, we got a paper on this back then, but so hardcore i only understand parts of it https://arxiv.org/abs/1205.5777
PS2: AdS/CFT (and we have at least one good candidate since Maldacena in string theory) correspondence shows that strongly coupled quantum systems in d dimensions are dual to *classical* gr systems in d+1 dimensions.
Somewhere somehow dualities seems to relate completely different systems, that non relativistic dissipative systems happen in all generality somewhere in that mess is barely a surprise.
I mean, if one believes ER=EPR GR and quantum mechanics are just the same thing.
He does says (said) a lot of stupid things, but also has a good analysis in some domains. He’s very influenced by meadows/ world3/ club de Rome and while it’s a toy model it certainly a good thing to have a global view.
So is ketamine but we haven't explored it more for other brain functions where it can act as a psychoplastogen eg reopening critical periods of visual learning.
The contributed proposition by the 10 year old kid to make fossil fuel companies pay for solar panels is perhaps the best policy proposal I’ve ever seen.
The second one is to make water companies CEOs swim in the Thames.
It biases maths and theoretical physics towards the rich.
That one thing that was free.
reply