Sasha [They/Them]

Yes, that Sasha 🍉

Transfemby 🏳️‍⚧️⬛🟪⬜🟨🏳️‍⚧
They/them

Anarchist/your local idiot with a guitar

If you’re occupying land in so-called “Australia”

If you eat food

And if you live on Earth

Introducing Trans Action Network Naarm! 🏳️‍⚧️
(Part of a wider solidarity network too!)

  • 2 Posts
  • 342 Comments
Joined 2 years ago
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Cake day: December 12th, 2023

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  • Yeah that’s why I said they hadn’t done work before they collect the particle, I assume capturing it will involve some transfer of energy but again it depends on the experimental setup.

    Very unsure of this, but I believe there’s relative motion between the thermal particles and the accelerating observer, so I guess it would make sense. I vaguely recall it being refered to as a thermal shower.

    Regardless, yes you have to provide the energy to create those particles somehow. You’re ending up with something other than the vacuum state and energy must be conserved.




  • It doesn’t, it’s a direct result of mixing relativity and quantum physics. It’s painfully complicated and I wouldn’t even know where to begin because I only really know how to understand it through the abstract mathematics.

    I guess the simplest explanation I can give is that in quantum field theory, the definition of what is and isn’t a particle depends on your frame of reference. Hence accelerating observers (in free space or hovering near black holes for example) see particles where others may see none.


  • FWIW that description of Hawking radiation is wrong and I think Hawking even says as much in his original paper on it. The real process is far far more complicated and involves tracing quantum field waves of various frequencies from the infinite past, through a collapsing star/black hole and into the future. Everything else is spot on.

    In QFT the definition of a particle itself becomes kinda abstract and hard to define in a consistent way.


  • I studied stuff like this in excessive detail a few years back but I don’t remember it super well now. Here’s my best guess from what remains of my intuition:

    An accelerating observer sees a shower of thermal particles due to a change in their reference frame. In QFT this is represented by a Bogoliubov transformation of the vacuum state to a non-vacuum state. I don’t think the observer has done work on the vacuum at this point as it’s technically still equivalent to the vacuum. When they collect particles, they put them onboard their ship in some container. When returning to an inertial frame they do work on them, expending energy and disrupting the vacuum state.

    In essence, when returning to the inertial frame, the state of the field is not represented by the inverse Bogoliubov transformation from the thermal Unruh state. There’s a complicating factor where energy is injected into the vacuum, and what that looks like mathematically depends on your experimental setup.





  • Sasha [They/Them]@lemmy.blahaj.zonetoLefty Memes@lemmy.dbzer0.comme_irl
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    8 months ago

    I’m glad Kirk is gone, I’ll never not be happy about that, I think it’s objectively good. But I think it’s still important to recognise that it’s very shitty that he did end up a miserable little cunt who was better off dead.

    Mostly though, I’m just worried about how celebrating death makes it seem like a virtue we’d want or accept in a new society. Revolution at a necessary cost, don’t get me wrong, but we shouldn’t celebrate the cost itself. I think it’s totally okay to celebrate the end result, “the problem of Charlie Kirk is now solved” or something lol, but the method was both objectively awful and necessary.

    Murder is a tool as all violence is, but we should it treat as what it is: a horrible one we’re forced to use to attain liberation and thus ultimately a form of violence inflicted upon us. After a revolution, I think it’s best left behind in this shitty fucking world we all hate.

    Regardless, get fucked Kirk, good riddance and rest in piss you slimey little cunt.






  • I don’t disagree with you at all. I think it’s true that they are both victims and a huge problem that needs to be fought against. Progressive/liberal activism is a massive problem for one of my collectives and we’re constantly suffering their attempts to undo every step forward.

    I think I understand the “Disney adults” thing but that’s not as common here in my experience. There’s certainly an equivalent of it, but it’s less dream world and more “I’ve got mine” reinforced by being completely separated from those who don’t, rather than blindly ignoring reality. It’s a product of having a relatively large and comfortable middle class and a culture of individuality 🤮.

    I also don’t really know how to push people to change, exposure to injustice works but I’ve only ever managed that when they’ve already started that process themselves. Get them involved in something that puts them in opposition with the state, like mainstream climate activism or something, and then provide more and more exposure to radical ideas and the suffering of those who aren’t favoured by the state. The problem is they have to be willing to engage with it at every stage…


  • I think you’re pretty on point with the normalcy bias and general sense of privilege, but I’m less inclined to agree on the insecurity and weak sense of identity. Of course I’m likely speaking from an entirely different political context given I’m not from the US (committing the sin of assuming you are though, correct me if I’m wrong).

    Even when those traits are present in liberals, I think they’re generally symptoms rather than the cause. It’s suprisingly easy for one to be disenfranchised and not realise; the neoliberal discourse tends to suppress unique identity in favour of assimilation/conformity and cowardice is a side effect of convincing people that the power to effect change lies solely in the ballot.

    I suppose the intentional disenfranchisement is how that faith is maintained. I tend to view the ignorant liberal as a victim and I know first hand that they can get free, but it either takes a lot of time or something big that realigns their worldview with reality, quite often both.

    There’s a lot more I cut out from my comment, but the general gist is that the systems of oppression rely on abusive tactics to create class traitors, and it makes me sad to see the well meaning progressive oppose real change. “Soft on people hard on power structures” is a saying I keep in mind, although it’s not a rule by any means and it doesn’t excuse anyone’s actions: we still have to fight against the liberals.