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

They/them

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Joined 1 year ago
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Cake day: July 20th, 2023

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  • Well, data just doesn’t really flow at the speed of light. It’s a really really complicated thing to discuss in terms of physical circuits because the true picture involves considering how the EM field evolves. Electrons in a circuit move at extremely slow speeds, ~millimeters per second.

    The good news is you don’t need to send information particularly fast to send it through time. Generally in physics, we build time travel systems by creating extremely curved spacetime that contains paths to the past, theoretically you could send light through such a path to transmit information back in time. As someone already mentioned, you generally need negative mass to construct these.

    If you have negative mass there are three options I’m aware of:

    1. Wormholes, stabilised and moved in the right way can form a link to the past (but only as far back as the moment they were created, this is true of all time machines as far as I know)
    2. Rotating torii of spacetime. Spinning spacetime is well known for creating weird time travel effects, a related option is an infinitely long rotating cylinder.
    3. A rotating warp drive. This thing will explode in a high energy shower of particles and thus it’ll be nearly impossible to use, but a friend of mine recently found a way to get particles to travel back in time through it.

    If you want to send information into the distant future, you could get really fancy and scatter some light off of a black hole or something.




  • I love trams, but in my city they’re often slower than busses. And we still have a ton of old rolling stock with no wheelchair access.

    I always prefer trains, but I no longer live near trams or trains. Instead I’ve got four bus routes, two of which go on the freeway just after the stop near my place. I’ve made it to my destination in under 10 minutes on that bus, it would normally be 20-30 minutes on a good day though.




  • 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’m pretty sure google drive just acts like a syncing tool in the same way as dropbox, so this would still act like a normal swap drive, presumably.

    That said, I’ve only used swap partitions so I’m not sure how it works when you point it at a directory, but I guess it depends how this person set it up.