Carrock

Senior Members
  • Content count

    219
  • Joined

  • Last visited

Community Reputation

27 Nice

About Carrock

  • Rank
    Atom

Profile Information

  • Gender
    Not Telling
  • Favorite Area of Science
    physics

Recent Profile Visitors

4098 profile views
  1. Can you witness the birth of the Universe?

    It was actually a speculative discussion of initial boundary conditions (i.e. the beginning of the universe) as applied to the steady state theory. As I've said, Bondi and Gold posited a 'perfect' universe which had been expanding 'unchanged' for infinite time, which Hoyle knew was impossible for basic mathematical reasons - it was formally disproved long before discovery of the CMBR. From Mach's Principle and the Creation of Matter The abstract and full conclusion make this even clearer. You have to create a free account to read the whole paper.
  2. Has time travel been discovered/harnessed yet?

    It's out of fashion these days, but I'm not aware of any reason that an antiparticle can't be interpreted as a particle travelling backwards in time as in e.g. Feynman diagrams. The 'same' particle exists in two places at the same time.
  3. Can you witness the birth of the Universe?

    Actually he didn't. See Mach's Principle and the Creation of Matter Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences Vol. 273, No. 1352 (Apr. 23, 1963), pp. 1-11 Hoyle used 'Steady State' in the conventional sense i.e. after startup transients have become negligible. Confusion arises because Bondi and Gold beat Hoyle into print with an eternal rather than steady state universe.
  4. Is the past infinite?

    You still haven't explained why you have to start in the infinite past. It's similar to my saying you don't exist because you couldn't get here from a billion years ago or from Andromeda. I never claimed that photons can cross 'infinite time'. If you want to demonstrate they can't, just show that they have finite range i.e, they somehow cease to exist within finite time (assuming no interaction with another particle).
  5. Can you witness the birth of the Universe?

    Each photon would disappear when it interacted with a charged particle; there would be approximately as many photons then as there are now, but none of them would exist for long i.e. the mean free photon length was very short. Photons existed before nucleosynthesis stopped; i.e. during the first ten seconds. Why do you think I think the BB is an actual explosion?
  6. Can you witness the birth of the Universe?

    Surely they existed before ~10 seconds after the Big Bang, just not for very long; i.e. have you a reference?. A few lucky photons probably survived from before neutral atoms existed, but probably not enough to observe.
  7. Is the past infinite?

    Why would you need to cross an infinite amount of time? (Actually photons can cross infinite time according to very robust theory; are they irrelevant?) You seem to be saying that because we can't in any way reach the infinite past or future they cannot exist and duration must be finite. This is a philosophical belief; i.e. it's not science. When matter (or a person) crosses a black hole's event horizon it can never again reach the rest of the universe. Does that mean the rest of the universe no longer exists? Does the rest of the universe still exist for other matter?
  8. Has time travel been discovered/harnessed yet?

    Time travellers only attended Stephen Hawking's party because they knew they could trust him to keep quiet and not destroy the delusion of causality.
  9. Laptop battery, how to increase life of

    I have a dell with a 'mainly use on mains power' option in the bios where the battery presumably recharges more slowly in a life prolonging way. Worth having a look.
  10. Apple rejects order to unlock gunman's phone

    Where can I buy a 20 Teraflop iphone?
  11. I agree with that as far as it goes. Conservation of energy and increasing entropy to heat death however are not always applicable in general relativity and quantum mechanics. --------------------------------------------------------- Statistically, very small regions undergo spontaneous reductions in entropy and there are also quantum fluctuations. Inflation posits that suitable very small low (classical) entropy fluctuations inflate into very large (> observable universe) low entropy volumes. Some versions of eternal inflation posit that this continues for finite but unlimited time. Other equally (im)plausible theories are available; a few have been falsified.
  12. The energy doesn't scale up. A football is a reasonable approximation to a giant gas molecule. It doesn't get moved around by random variations in air molecules' K.E. like a grain of pollen as observed in Brownian motion. There's lots of apparently plausible perpetual motion machines around; this is as far as I'm going with this one.
  13. You could get even more power out with a heat engine running between ambient temp and the graphene which has been cooled by converting heat to work. I still haven't seen anything to suggest this isn't a second order perpetual motion machine. The original reference https://thibado.uark.edu/wp-content/uploads/sites/316/2017/06/PhysRevLett.117.126801.pdf is a little unclear but seems simply to claim that externally stressed graphene can produce useful power output.
  14. Only a rhetorical question. Consciousness as we know it depends on brains which inter alia are sophisticated heat engines producing a net increase of entropy. Actions by such creatures would also increase entropy at least as much as the reduction of entropy by their actions. If they are not limited like that, you may may as well say they run on magic or call them 'Maxwell's demons.' Such demons are an interesting concept, and if they existed could be used in a second order perpetual motion machine. You may find https://en.wikipedia.org/wiki/Maxwell's_demon interesting.
  15. What would these creatures live on? i.e. they presumably have to violate the second law themselves.