Comment on [troll science]: Unruh particle shower on a centrifuge

ladicius@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

• whyNotSquirrel@sh.itjust.works ⁨2⁩ ⁨weeks⁩ ago

  can someone explain the joke to this person? I don’t have time.

  source

  • lime@feddit.nu ⁨2⁩ ⁨weeks⁩ ago

    the unruh effect is apparently a hypothetical situation where an accelerating body in a complete vacuum still encounters particles. i had no idea about this, sounds weird as hell.

    source

    • TauZero@mander.xyz ⁨2⁩ ⁨weeks⁩ ago

      Like many other popular weird physics effects, it has been accepted non-controversially by scientists and then popularized for decades in fun thought experiments and pop-sci videos, all of which neglecting to mention that no actual experiments have yet been performed. This lack of grounding leads to spread of confusing statements like “the Unruh particles exist in the accelerated frame but not in the lab frame”, which make no sense, for how can there be two separate realities that coexist? Luckily we now do have a first Unruh experiment from 2019 arxiv.org/abs/1903.00043v7 and the temperature did rise and reality did not split apart. So no longer hypothetical, just routine and boring.

      source

      • porous_grey_matter@lemmy.ml ⁨2⁩ ⁨weeks⁩ ago

        Routine maybe, I don’t think it’s that boring

        source

        • -> View More Comments
    • Scubus@sh.itjust.works ⁨2⁩ ⁨weeks⁩ ago

      Didnt read that yet, this is all from memory.

      From my recollection, the unruh effect is a side effect of referance frames and event horizons. For any given object, you can calculate that objects future path through space time. There will be objects that are too far away for that object to interact with until a certain amount of time has passed. That means those objects are beyond the causality of your original object. This creates an expansign event horizon where anything before it can theoretically be interacted with, and anything past it cannot until the future. The issue is that on the border, on the event horizon, you have virtual particles popping in and out of existance. These particles normally annhilate each other and therefore measurably dont matter. But you have the ability to interact with one without interacting with the other, because its beyond your sphere of influence. But if you can interact with it, it can interact with you. This means you measure a noticable increase in energy at the event horizon because youre only measuring half of the virtual particle, the half that you can interact with and the half that can interact with you.

      source