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@ gandalf_der_12te @feddit.org

Posts
39
Comments
475
Joined
2 yr. ago

Hallo ich mache Philosophie, Technik und Gesellschaft.

  • Because Google cares about us

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  • we need hardware that allows to unlock and relock the bootloader after installing alternative operating systems. then you can use grapheneOS and others on your devices. i think motorola is already making steps towards this. i remember reading articles about it.

  • Because Google cares about us

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  • doesn't that require a google account or am i remembering that wrong?

  • Because Google cares about us

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  • they're trying to make general-purpose computers into special-purpose computers. (the special purpose is to comply with google)

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  • Basically, on a cosmological scale, distance and velocity are connected

    yeah btw to comment on this: this phenomenon is probably more important than it seems at first glance. because it implies that, while there is neither an absolute position nor an absolute velocity in relativity theory, there is a connection between position and velocity. so, for each position in space, there is an associated (finite) zero velocity, or reference velocity, which is the velocity of the cosmos at that location. or at least that's what i'm lead to believe.

    now, this is not at all obvious. one might argue that that's bullshit, frankly, (because it very obviously contradicts special relativity), but it appears at least 3 times in various aspects of standard models of cosmology:

    • for one, contemporary microwave background. it's said to be isotropic (and has the shape of a black body radiation) but only if the observer moves with a certain velocity. if you move extremely fast in either way, one side gets blueshifted while the other one gets redshifted, so it's not isotropic anymore. there's exactly one (finite!) velocity for which it is most isotropic, which is the "average velocity" of the radiation.
    • then there's the whole question of how a vacuum energy could possibly be lorentz-invariant. the way i see it, if there is radiation in space everywhere, then that would have to be similar to microwave background (just at another frequency). so it again would have to have a certain average velocity. note that this is different from the previous point because while the previous point uses other objects as reference frame (that might not be present in an alternative universe), this one does not. you cannot have a universe with the same laws as ours that's completely empty of vacuum energy, so there's always some reference frame.
    • then there's the issue that if you go really far back in time, the cosmic expansion is not lorentz-invariant. well, at least not if you look at this curve:

    if you tilt it somewhat, it's not isotropic anymore. because while expansion rate is accepted to vary with time, it should be homogenous in space. now, if you do a lorentz-transformation, these two things cannot hold at the same time. so, cosmic expansion wouldn't be lorentz-invariant?

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  • actually cosmological redshift occurs not so much because a velocity difference between source and observer, but because space is expanding while the wave is in it, or so i was told. so the wave continuously gets stretched out, which causes it to redshift. calculating it that way gives slightly different results from normal doppler redshift, i think. so it does matter.

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  • assuming we want the frequency to double,

    going by this formula: https://en.wikipedia.org/wiki/Redshift

    with the wavelength ratio 1 + z we want 1 + z = 1/2 so v = -3/5 c = -0.6c if i calculated correctly (i did this in my head without a napkin), where the source moves away from the observer with velocity v. so it would have to move towards you quite rapidly.

  • It can’t be, but it is

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  • yeah mastodon leans in on hashtags heavily too

  • Meta's AI Data Center Caught Infecting Town Water Supply With Deadly Bacteria

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  • Meta's AI Data Center Caught Infecting Town Water Supply With Deadly Bacteria

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  • how does a datacenter even contaminate water?

  • It can’t be, but it is

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  • today i learned that loops video is still around, and it actually has some good content.

  • What's the most interesting fringe group you've learned about?

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  • yeah it's also my impression. i've never been with the freemasons but from my impression as an outsider, it's a very outdated structure. not sure whether they still don't allow women in. yeah, it's basically a socializing circle for rich folks. lots of rituals, but no deeper spirituality as far as i can tell. you can probably learn more from 6 months at a 3-person philosophy circle than from a decade at the freemasons.

  • Framework proved repairable laptops can work, but almost nobody is willing to buy one

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  • let me guess: the devices live 2x as long but cost 3x as much?

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  • yandex for images. every search engine sucks in different ways for everything else. google is good but gives me the spyware cramps.

    oh and wikipedia is good for scientific topics.

  • How should I be describing or categorizing Lemmy to other people?

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  • open source reddit that is accessible through the fediverse account.

    if people don't know reddit: "it's organized around communities instead of user accounts. so you don't follow user account, you follow communities instead that each have a specific topic that's being discussed or talked about. like video games, football, memes etc."

  • Pretty Much Every Problem

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  • nah it wouldn't

    1. if it would, you'd be hired top manager by now. you aren't because things are not that easy
    2. you're running into the fallacy of the invisible self right here. you do not see the cost that you bring into the world simply by existing, because people typically have a blind-spot on themselves. they do not see the errors that they make themselves.

  • Future

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  • i mean, this mostly applies to american mindset. "work hard" is a function of progress; in the absence of progress, it stops making sense. and people who only knew how to work hard their entire life suddenly see that way of life ending.

    there's a lot of americans who think that way. "work hard and you can make it". nah

  • TIL about bifacial solar cells which produce electrical energy when light hits either side

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  • While there power per panel surface is lower, the timing of peak outputs is an excellent complement to standard solar. It has maximum output in the morning and evenings, when people want to run home appliances etc, rather than at midday when they are all at work.

    yeah i'm well aware of that. the problem is more that you can more effectively shift power around from midday to evening and morning with batteries.

  • TIL about bifacial solar cells which produce electrical energy when light hits either side

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  • uhm, that's not economical. to effectively transform a worldwide energy supply (that's a very high amount of energy throughput), you need economic advantage. and this isn't it. please put the solar panels at an angle sothat they collect more sunlight or the solar park isn't gonna pay itself off anytime soon.

  • TIL about bifacial solar cells which produce electrical energy when light hits either side

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  • you can actually make these things very easily by just taking two ordinary solar panels and basically glueing them together.