3 ms·

This stunning video / visualisation features the evaporation of everything. Ultimately everything cools to absolute zero. Time becomes meaningless. Timelapse o

This stunning video / visualisation features the evaporation of everything. Ultimately everything cools to absolute zero. Time becomes meaningless. Timelapse of the Future: A Journey to the End of Time https://www.youtube.com/watch?v=uD4izuDMUQA https://www.youtube.com/watch?v=uD4izuDMUQA edit: discussed previously here: https://news.ycombinator.com/item?id=33046171 https://news.ycombinator.com/item?id=33046171

adhesive_wombat 3y ago
Melodysheep in general is just amazing, both for the Symphony of Science remixes (and film/TV ones) and the more recent science-y videos. The Museum of Alien Life is stunning and reminds me of a sci-fi Encarta MindMaze. https://youtube.com/watch?v=ThDYazipjSI https://youtube.com/watch?v=ThDYazipjSI
meroes 3y ago
Things still happen in heat death because of quantum mechanics and fluctuations. Time still has a meaning, but it may lose its arrow if microscopic quantum interactions are what dominates. At a small scale, these have no direction in time. The direction is macroscopic. My favorite semi related video on this is Susskind’s: Why is time a one way street? https://www.youtube.com/watch?v=jhnKBKZvb_U&t=600s https://www.youtube.com/watch?v=jhnKBKZvb_U&t=600s (YouTube) It’s a one way street because the multiverse makes observer moments like ours (ones not in heat death like Boltzmann brains) a common state of affairs. That is unachievable in our universe because of infinite heat death. Something must exist outside of our universe (other universes) to offset the future of our universe where Boltzmann brains will dominate the class of observers. If infinite in time heat death with fluctuations is our universe’s fate, that we are not Boltzmann brains is secured by a multiverse which makes many more universes not in heat death which outpace the ones in heat death. Yes BB’s really are a problem to modern physics/cosmology, and one way out is a multiverse where many many more universes are spawned (and non-degenerate ones) by the time one is in heat death.
- pixl97 3y ago
  https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology If everything but what exists at the quantum level then CCC is a possibility.
  - meroes 3y ago
    I’m petty sure this is loosely agreed by Susskind except CCC is a more specific version. Entire bubble universes have a chance to fluctuate out of any patch of spacetime. (Colemann-Delucca process or something). That fractal nature of spacetime is appealed to by Susskind in the video.
- passion__desire 3y ago
  Sean Carroll disagrees wrt Boltzmann brains will dominate the class of observers. https://youtu.be/nqQrGk7Vzd4?t=2614 https://youtu.be/nqQrGk7Vzd4?t=2614
  - meroes 3y ago
    That’s because he disagrees with mainstream cosmology models in a different way than Susskind. Susskind takes the cosmology of our bubble universe as more settled, but addendums a huge inflationary multiverse on top. I’m pretty sure Carroll disagrees with the cosmology model of our bubble universe, and uses that to rule out BB’s dominating instead. Susskind’s says BB’s dominate any single universe over time, but not the multiverse as a whole.
- benlivengood 3y ago
  There's also the branches of our multiverse where we simply don't experience heat death due to being on the unlikely side of the 2nd law of thermodynamics. Infinite simulations in those branches could account for a lot of "normal" experience. I haven't done the math but it seems intuitively like a simulation that keeps running in 10^-M branches (effectively quantum immortality) due to avoidance of entropy increase are more frequent than the 10^-N occurrence of boltzman brains where N>>M.
wruza 3y ago
There’s also one of MetaBallStudios perspective comparisons. They usually get recommended for less serious videos, but this one is something else: https://youtube.com/watch?v=Zb5qTdb6LbM https://youtube.com/watch?v=Zb5qTdb6LbM

adhesive_wombat 3y ago

Melodysheep in general is just amazing, both for the Symphony of Science remixes (and film/TV ones) and the more recent science-y videos. The Museum of Alien Life is stunning and reminds me of a sci-fi Encarta MindMaze. https://youtube.com/watch?v=ThDYazipjSI https://youtube.com/watch?v=ThDYazipjSI

meroes 3y ago

Things still happen in heat death because of quantum mechanics and fluctuations. Time still has a meaning, but it may lose its arrow if microscopic quantum interactions are what dominates. At a small scale, these have no direction in time. The direction is macroscopic. My favorite semi related video on this is Susskind’s: Why is time a one way street? https://www.youtube.com/watch?v=jhnKBKZvb_U&t=600s https://www.youtube.com/watch?v=jhnKBKZvb_U&t=600s (YouTube) It’s a one way street because the multiverse makes observer moments like ours (ones not in heat death like Boltzmann brains) a common state of affairs. That is unachievable in our universe because of infinite heat death. Something must exist outside of our universe (other universes) to offset the future of our universe where Boltzmann brains will dominate the class of observers. If infinite in time heat death with fluctuations is our universe’s fate, that we are not Boltzmann brains is secured by a multiverse which makes many more universes not in heat death which outpace the ones in heat death. Yes BB’s really are a problem to modern physics/cosmology, and one way out is a multiverse where many many more universes are spawned (and non-degenerate ones) by the time one is in heat death.

pixl97 3y ago
https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology If everything but what exists at the quantum level then CCC is a possibility.
- meroes 3y ago
  I’m petty sure this is loosely agreed by Susskind except CCC is a more specific version. Entire bubble universes have a chance to fluctuate out of any patch of spacetime. (Colemann-Delucca process or something). That fractal nature of spacetime is appealed to by Susskind in the video.
passion__desire 3y ago
Sean Carroll disagrees wrt Boltzmann brains will dominate the class of observers. https://youtu.be/nqQrGk7Vzd4?t=2614 https://youtu.be/nqQrGk7Vzd4?t=2614
- meroes 3y ago
  That’s because he disagrees with mainstream cosmology models in a different way than Susskind. Susskind takes the cosmology of our bubble universe as more settled, but addendums a huge inflationary multiverse on top. I’m pretty sure Carroll disagrees with the cosmology model of our bubble universe, and uses that to rule out BB’s dominating instead. Susskind’s says BB’s dominate any single universe over time, but not the multiverse as a whole.
benlivengood 3y ago
There's also the branches of our multiverse where we simply don't experience heat death due to being on the unlikely side of the 2nd law of thermodynamics. Infinite simulations in those branches could account for a lot of "normal" experience. I haven't done the math but it seems intuitively like a simulation that keeps running in 10^-M branches (effectively quantum immortality) due to avoidance of entropy increase are more frequent than the 10^-N occurrence of boltzman brains where N>>M.

wruza 3y ago

There’s also one of MetaBallStudios perspective comparisons. They usually get recommended for less serious videos, but this one is something else: https://youtube.com/watch?v=Zb5qTdb6LbM https://youtube.com/watch?v=Zb5qTdb6LbM