Physics nerd. Currently studying some quantum gravity adjacent stuff in QFT

They/them

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Joined 2 years ago
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Cake day: July 20th, 2023

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  • I have a personal server, mostly acting as a NAS but with some web hosting as well. For whatever reason, it randomly freezes until you manually power cycle it, it happens really often, like every 20 minutes.

    Turns out it’s due to some weird interaction between debian and older ryzen CPUs, if the CPU isn’t busy it just dies. Solution? A Minecraft server, with no one on it, it keeps the CPU just busy enough to keep it alive. I’ve had it running for months at a time with no issues.









  • I appreciate you revising your reply to be less harsh, I wasn’t aiming to correct you on anything I was just offering some thoughts, I find this stuff interesting and like to chat about it. I’m sorry if I made your day worse, I hope things improve.

    I said superconducting semiconductors as just a handy wavy way to refer to logic gates/transistors in general. I’m aware that those terms are mutually exclusive, but thats on me, I should have quoted to indicate it as a loose analogy or something.

    The only thing I disagree with is your assessment that computation doesn’t create heat, it does. Albeit an entirely negligble amount, due to the fact that traditional computation involves deleting information, which necessarily causes an increase in entropy, heat is created. It’s called Landauer’s principle. It’s an extremely small proportion compared to resistive loss and the like, but it’s there none the less. You could pretty much deal with it by just absorbing the heat into a housing or something. We can of course, design architectures that don’t delete information but I’m reasonably confident we don’t have anything ready to go.

    All I really meant to say is that while we can theoretically create superconducting classical computers, a room temperature superconductor would mostly still be used to replace current superconductors, removing the need for liquid helium or nitrogen cooling. Computing will take a long time to sort out, there’s a fair bit of ground to make up yet.


  • There is still heat generated by the act of computation itself, unless you use something like reversible computing but I don’t believe there’s any current way to do that.

    And even then, superconducting semiconductors are still going to be some ways off. We could have superconductors for the next decade in power transmission and still have virtually no changes to processesors. I don’t doubt that we will eventually do something close to what you describe, but I’d say it’s easily a long way off still. We’ll probably only be seeing cheaper versions of things that already use superconductors, like MRI machines.




  • I don’t really understand why, but this seems to be a common misunderstanding of the multiverse theory.

    All it says is that every possible universe exists, so it’s not at all required that everything you can think of exists, just everything permitted by physics. Possible is the keyword here, and you can still have an infinity of universes even if you restrict what is possible.

    I’m no expert on the subject, but as I understand it there are generally two types of multiverse theory. The one where you have infinite universes all with the same physical laws, but every unique possibility under those laws exists in the multiverse. And the one where every possible variation on the laws of physics exist (generally talking about different coupling constants rather than entirely different laws). It’s entirely reasonable that both types are one in the same.

    In either case, it wouldn’t really be consistent for there to be a universe where the multiverse doesn’t exist, unless it is the only universe and there is no multiverse at all.