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Thread: Imagining Infinity

  1. #1 Imagining Infinity 
    Time Lord zinjanthropos's Avatar
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    If we are part of a multiverse then how can our universe be infinite in size and shape? Or how can something be infinitely straight or curved, flat or round? I’m imagining a collection of universes like soap bubbles in the dishwater, to me they’re finite shapes, is there a different way to look at them?


    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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    ox
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    Take a read of this: https://www.amazon.co.uk/What-Cannot.../dp/0007576668


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    I try to imagine an infinite ocean of water. There is still twice as much Hydrogen as Oxygen.

    Does that mean there is 2x infinity of Hydrogen?? Or is it 1/2 infinity of Oxygen?


    But something to remember is: even if the universe is infinite, the area of it that you can experience is still finite. No matter how fast you travel, even if it's faster than light, a finite amount of time will have elapsed since you started your journey.

    Consequently, you can only experience a finite amount of space. Does it really matter what lies beyond that?
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    Time Lord zinjanthropos's Avatar
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    Does infinite go both ways? If something can be infinitely large then is opposite true, can something be infinitely small?
    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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    Time Lord zinjanthropos's Avatar
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    Confused once again. Just how do they measure light’s wavelength? I thought observing light collapsed the wave function, if so then how is wavelength determined? If I design something that only allows a certain wavelength to pass through then what exactly am I measuring, particle or wave?
    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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    Forum Masters Degree Double Helix's Avatar
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    Quote Originally Posted by zinjanthropos View Post
    Confused once again. Just how do they measure light’s wavelength? I thought observing light collapsed the wave function, if so then how is wavelength determined? If I design something that only allows a certain wavelength to pass through then what exactly am I measuring, particle or wave?
    In general, spectroscopy is something you can look at to understand how wavelengths can be measured:

    https://en.wikipedia.org/wiki/Spectroscopy
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    Question re length contraction : Hope I get this right. If the universe was once a single object containing all the mass there is, then once accelerated near light speed would it eventually contract to Planck length when measured, dependent on frame of reference?
    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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  10. #9  
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    Quote Originally Posted by zinjanthropos View Post
    Question re length contraction : Hope I get this right. If the universe was once a single object containing all the mass there is, then once accelerated near light speed would it eventually contract to Planck length when measured, dependent on frame of reference?
    At last something I think I can answer with some confidence.
    There is no frame of reference by which you can measure the universe


    Oh,as well I think "mass" depends on the frame of reference and if the universe is in one place I am not sure that makes sense.Did you mean to say "matter?
    ,perhaps?

    Again not sure what "accelerating the universe (to any speed) would mean in practice.I think that bits of it might accelerate wrt other bits

    Then again if you are talking about inflation or expansion I don't think that is considered to be "acceleration"
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