• 0 Posts
  • 10 Comments
Joined 1 year ago
cake
Cake day: June 10th, 2025

help-circle
  • The generalization of the concept of “life” beyond earth-style carbon-based biochemistry is still in active debate. As far as I’m aware, the most consensual definition is the one called “lyfe” (to distinguish from the aforementioned carbon-based chemistry, a concept formulated by Stuart John Bartlett and John L Wong in 2020). It has four characteristics:

    • dissipation : the ability to use/convert energy sources (arguably a thing that stars do)
    • autocatalysis : the ability to grow exponentually (I guess you could argue it happens during the initial star formation before it reaches an equilibrium… Maybe)
    • homeostasis : the ability to compensate for small disturbances in environment (unclear to me what those disturbances and what this adaptation would be in the case of stars)
    • learning : the ability to record, process and adapt to information (no such thing in stars as far as I know)



  • gbzm@piefed.socialtoScience Memes@mander.xyzI'm good, thanks
    link
    fedilink
    English
    arrow-up
    2
    ·
    8 months ago

    Ah so I think I sort of conflated RQM and MWI because I thought it was all about Everett’s other paper “relative state formulation of qm”.

    I thought on top of an ad hoc rehabilitation of physical realism, the universal state also did something for the consistency. Something like all the density operators may be expressed as partial traces of the operator describing the their systems’ union, in order for everything to be consistent, and the ‘largest’ operator describes the state of the universe or something.

    I’ll check out your sources next insomnia, thanks


  • gbzm@piefed.socialtoScience Memes@mander.xyzI'm good, thanks
    link
    fedilink
    English
    arrow-up
    2
    ·
    8 months ago

    My understanding might be a bit superficial, but I thought the whole point of the MWI was to make explicit the fact that states are relative? To me the rationale was that states are relative and if we simultaneously describe relative states and their observers we can translate the shrödinger+born-rule in a density-operator+partial-trace-rule and make the wave function collapse physical (aka unitary) through branching and decoherence, even though that’s mathematically tedious and in practice people will keep using projectors (1). States being relative means their physical reality is somewhat broken but locality is mostly saved (2), so then we postulate that they derive from a universal wave function to rehabilitate some form of physical realism (3). As to (4), isn’t it solved if you assume that Schrödinger’s equation is actually the less fundamental formalism since it’s only valid for systems that are unrealistically isolated?