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  1. petm1

    I Spacetime relativity

    Thank you.
  2. petm1

    I Spacetime relativity

    We measure an accelerated expanding Earth at the surface, we do not measure this with our ruler, but we do measure it with our accelerators.
  3. petm1

    I Spacetime relativity

    Because we do not measure it, except with our accelerators.
  4. petm1

    B Confusion about the Big Bang

    How would you be able to describe BB as a point? As a part of the energy dilating out from Big bang, I would have an inside view looking out in every direction of space from the hot dense state, the same way we view the CMBR now, not an outside view of a hot dense point, like the view of our sun.
  5. petm1

    Pre-Big Bang < than a proton?

    If space were contracting, but space is expanding so could this outward pressure, via big bang, predominate in the early universe or be the cause of inflation?
  6. petm1

    Radical new take on *uni*verse questions by Smolin, could be important

    Thank you marcus, you always have the best links.
  7. petm1

    Can time have a direction

    Time dilates in every direction. I may be able to talk about the expansion rate of space between two or more objects with two or more directions between them but I would also be correct to speak of space as a single entity dilating in time. Space and time are two ways we use to describe the...
  8. petm1

    Can time have a direction

    Sorry I must admit that using the scale factor of the universe as a function of time looks like the best calendar man has to date but I fail to see why this proves my view false.
  9. petm1

    Can time have a direction

    On my gps the tracking of my movement with vectors is called the scout program, I used it for backpacking. I see all three elements of time which ever direction I look in the spatial dimensions. Space and time are always intertwined with the observer, in his own present, gazing outward...
  10. petm1

    Was the flow of time slower in the early universe?

    Entropy of the universe goes from the order of one simultaneous event, the same for all future clocks, to the disorder of differences between clocks, as viewed via photons, counting their own simultaneous existence.
  11. petm1

    Was the flow of time slower in the early universe?

    At some point in the smaller denser hotter past all the makings for all of our clocks were local and ticking at the same rate.
  12. petm1

    Was the flow of time slower in the early universe?

    I would think that in the early universe time ticked at the same rate for all clocks, coordinate time was the only time. As the duration of the universe increased the difference between coordinate time of the universe and the proper time of matter began to differ as they aged at about the same...
  13. petm1

    Where is the edge of the universe

    I was under the impression that all matter, in the form of atoms, formed just after the decoupling of photons we see as the cmbr. I did not know new atoms were formed all the time I thought that new atoms were just a recombination of existing atoms into heaver ones not new ones. Thanks.
  14. petm1

    Where is the edge of the universe

    The duration of a photon from emission til reception added to the age of the emitting atom at emission will always equal the age of the atom that is receiving the photon in the present. Could you please show me the error in my thinking.
  15. petm1

    Where is the edge of the universe

    Everything we observe is the same amount of time. The age of the atom at emission of a photon plus the duration of the photon always add up to the same present. Say I look out in the night sky with my hand out in front of me. The age of the atom within my hand plus the duration of the young...
  16. petm1

    Where is the edge of the universe

    Restricted to space/time, each edge, center, and boundary with a defined state are temporal in nature. Using the photon as our ruler, with all photons traveling outward from emission, I would think the younger photons show us a outer edge of the universe we see as smaller. Yet what about the...
  17. petm1

    Where is the edge of the universe

    I like this, does it help when I add 'as measured using the youngest photons'.
  18. petm1

    What is Space?

    What is space, like the question what is time, can no longer be answered one without the other. Myself I have been wondering what part of time is space, other than the present we all share.
  19. petm1

    Can time really be slowed?

    Why a shorter path? I would think a longer duration between the changes counted by B's clock or the longer path of B's world line accounts for fewer tick marks when reunited with A's clock that keeps a steady duration or the shorter world line.
  20. petm1

    The expansion of time, probably ad nauseum

    I would think that in the beginning of a collapsing universe you would never get signals between points the signals would be getting smaller and moving away from all other points. I think that it all goes back to the block universe and the simultaneous nature of energy in the present so if you...
  21. petm1

    The expansion of time, probably ad nauseum

    Isn't this how we get back to big bang, take the universe as it is now and run the clock backward as if a contracting universe instead of a dilating one?
  22. petm1

    The expansion of time, probably ad nauseum

    The FLRW metric starts with the assumption of homogeneity and isotropy of space. It also assumes that the spatial component of the metric can be time-dependent. The arrow of time follows the metric as it expands, one duration relative to our present moment with the count of a clock, but are we...
  23. petm1

    The expansion of time, probably ad nauseum

    I was not thinking about reading each others clocks, I was thinking more along the lines of the red shifted photon from space and from a gravity well. One caused by an expanding spatial component the other by a dilating temporal component.
  24. petm1

    The expansion of time, probably ad nauseum

    Why don't we think of this as the gravitationally bound part of the universe, after all we know time is a local variable yet its motion is always dilation?
  25. petm1

    How can we see Big Bang?

    To look back at big bang we use two directions, looking outward with a telescope we can detect the oldest of photons, and looking inward using microscope, or a collider, we detect the elementary particles. Both of these directions show a path to a common point in the past after all both have...
  26. petm1

    Dealing with Infinity

    Why not, our visible universe is finite, limited in time, but may be infinite at both extremes.
  27. petm1

    Edge of universe?

    One temporal edge of the universe is the little twist in time we call the big bang but I think of the spatial edge of the universe as that represented by the stress-energy tensor of our present.
  28. petm1

    Edge of universe?

    Looking out into space is the same as looking back in time. Looking out and seeing signals from one event in every direction such as the surface of last scattering appears to be seeing from the inside of the event sort of like seeing the inside walls of my den. Looking at the keyboard in front...
  29. petm1

    Edge of universe?

    Edge as in a line where an object begins or ends or a point near the beginning or the end, both would describe a photon with a emission/reception point. The youngest photons that I share the present moment with looks to be the outer edge of the universe I see. The other edge between the stars...
  30. petm1

    Edge of universe?

    I would think that the point where matter and light interact would always be an edge. A temporal edge to our universe using a photon as a ruler would be the difference between the durations of photons, oldest and youngest. The oldest from CMB and the youngest from matter, emission til...
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