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

They/them

  • 0 Posts
  • 20 Comments
Joined 1 year ago
cake
Cake day: July 20th, 2023

help-circle
  • 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.



  • Again, it’s not dividing race at all.

    There are two good reasons for putting it in the constitution. One, it stops it being repealed by the opposition who have a history of that sort of thing, thus it won’t be limited to the term of a specific government.

    Secondly, Australia’s history is 100% built on disenfranchisement of our first people. Slavery, being defined as fauna, voting rights younger than a lifetime etc. Our national identity built this problem, our constitution should recognise who this country belongs to, it should recognise who this country has murdered, abducted and generally hated for it’s entire history. This definitely belongs in our constitution, colonialism stole Australia and it’s only fair to recognise that.


  • Solving systemic racial injustice is an inherently one sided thing, and that isn’t racist or divisive.

    What is racist and divisive is allowing the traditional owners of the land to be trapped in perpetual poverty, with significantly shorter lives and with next to no hope of help. Setting up something to address an imbalance like this, to bring actual equality, is not racist.

    There’s a fairly well known saying “when you’re accustomed to privilege, equality feels like oppression.” Things aren’t getting worse for you, we’re just trying to pull other people out of a hole so they can stand beside you.










  • A girl I had been seeing for years, and thought I loved more than anything. After a lot of really intense drama that I honestly didn’t think I’d survive, and the following analysis with a psychologist, I realised she’d been emotional manipulating me for a very long time.

    When I finally cut her out, things just became so much better. I’ve learnt what a truely kind and loving person can be like, and what it’s like to not walk on eggshells or have constant anxiety. So many seemingly innocent comments that in hindsight were insanely toxic controlling statements. It’s been incredible to feel free.







  • 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.