Recent content by durant35

  1. durant35

    B De Sitter Equilibrium: Could it Exist in Heat Death?

    Aren't they saying that the fluctuations are an impossibility in de Sitter rather than very unlikely? Or did you meant something else by 'very unlikely'? Oh, okay. So the problematic equilibrium would be avoided, there wouldn't be any radiation or particles at all, just empty space?
  2. durant35

    B De Sitter Equilibrium: Could it Exist in Heat Death?

    What would happen if Andy was right in the long term future of the universe? Would the universe recollapse on itself or something like that - how would the dSE hypothesis be avoided?
  3. durant35

    I Equilibrium of Universe: Earth vs. Black Hole

    Hey, thanks for the detailed answer. So is it legitimate to say that that different causal patches equilibrate/asymptote to de Sitter depending on their matter content? I'm keen to connect this to some holographic ideas which are quite popular in recent times. It seems to me that the duration...
  4. durant35

    I Equilibrium of Universe: Earth vs. Black Hole

    I have a question regarding the process of getting towards equilibrium in our universe. If we imagine a causal patch with our planet at the centre, every planet will redshift away from us an after a while the planet itself will disintegrate, let's call this process the decay of Earth. Eventually...
  5. durant35

    I Expanding universe and quantum wavefunctions

    Yes, I was wondering what will happen with wavefunctions of the particles in the dark energy dominated universe approaching heat death. Will they spread due to lack of interaction between particles or will they have some meaningful wavelength that stays constant because of dark energy?
  6. durant35

    I Expanding universe and quantum wavefunctions

    In a dark energy dominated universe, it seems that all the particles get away from each other and that the final state will be one with one or zero particles per horizon. This sounds very intuitive, but it is based on classical physics and GR. Particles have wavefunctions and this is whar...
  7. durant35

    I Hawking radiation from de Sitter horizon

    But then, why does Sean Carroll in this paper: https://arxiv.org/abs/1405.0298 talk about the radiation as if it were only an effect of empty de Sitter phase, when all matter is diluted by expansion - when the universe is empty with just a cosmological constant? Does the Hawking radiation (the...
  8. durant35

    I Hawking radiation from de Sitter horizon

    But is this only a far future effect when we have de Sitter space or does there exist Hawking radiation right now and during the era with matter? I've mostly heard that it is a far future effect, since the radiation cannot reach the oberver until the end of his wordline.
  9. durant35

    I Hawking radiation from de Sitter horizon

    Regarding my question about present day Hawking radiation, one user posted this: !Theoretically, yes, there is a temperature associated with the event horizon of an accelerating spacetime. You can call it a "Hawking" (although see caveat below) or "de Sitter" temperature. Since one observer's...
  10. durant35

    I Hawking radiation from de Sitter horizon

    I have some questions regarding the temperature of empty space in a de Sitter universe or to say it better - the Hawking radiation emmited from the cosmological horizon: 1) Do particles that make up the radiation get produced by the empty space inside the patch (the Bunch Davies vacuum) or by...
  11. durant35

    I Don Page - cosmological doomsday argument

    I still don't understand why Page's and Sean's calculations differ so dramatically. Sean's model seems very natural but the numbers are drastically different than Page's. Maybe someone who has a better insight can read both of papers and give a specific mention of what is wrong from Page's...
  12. durant35

    I Equilibrium chaotic environment

    Cosmological fluctuations from equilibrium are best described in the Boltzmann brain paradox. My question may very well be better suited for statistical mechanics but it has relations with cosmology so I'll post it here. Anyway, it is often stated that BBs will perceive chaotic observations...
  13. durant35

    I Don Page - cosmological doomsday argument

    That's exactly what is the motivation behind my thread. Hawking radiation from the de Sitter horizon is relevant much later, as far as I know the numbers they are all exponentially greater than his 1060 years which is basically nothing in comparision to the timescale for when the universe will...
  14. durant35

    I Don Page - cosmological doomsday argument

    Yup, this is the paper I was talking about. I think the second main issue is that Don Page does an estimate without including the exponential suppression that Sean and colleagues mentioned. Also, Page's paper is quoted as reference 42 as an example where BBs are created in a Minkowski vacuum, so...
  15. durant35

    I Don Page - cosmological doomsday argument

    I'm not referring to the abstract and the chapter where he indeed mentions the model in which dark energy decays, but the chapter in the paper where he mentions that the spacetime volume needs to be e1050 for vacuum fluctuation observations to outnumber human observations and that if the...
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