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Wikipedia tells us:

In physical cosmology, cosmic inflation, cosmological inflation, or just inflation is the exponential expansion of space in the early universe. The inflationary epoch lasted from 10-36 seconds after the Big Bang to sometime between 10-33 and 10-32 seconds. Following the inflationary period, the Universe continues to expand, but at a less accelerated rate.

I've no idea about astronomy, I just wondered whether somebody ever published a theory about cosmological deflation, which would make the universe shrink in a fraction of a second.

In a SFI novel you could travel by locally causing a deflation of space in the direction of your spaceship; the unshrunken space of a lightyear would (only locally in front of the ship) measure 1000 km for the fraction of the second. Or maybe a technically very advanced civilization could keep its solar system inflated by the time of a deflation of the whole universe and thus survive, which leads to the interesting question, whether this solar system could reenter the space of the next universe after its new cosmolocical inflation and if yes, does somebody look out for stellar systems at places in space where you wouldn't expect them?

However: cosmological deflation?

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    $\begingroup$ @HDE 226868 Thank you for editing the exponents! $\endgroup$
    – Keks Dose
    May 3, 2015 at 8:17

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There are a number of flaws with your idea (despite the relativity breaking transatlantic journey times that would be possible).

Inflation is a popular theoretical model put forward to solve three main issues with the Big Bang cosmology: the horizon problem, the flatness problem & the magnetic monopole problem (see the wiki for details). It consists of a scalar field called the inflaton, a physical field that pervades all space. During inflation it undergoes a phase transition to a lower energy state, releasing huge amounts of energy that drive the expansion. To force the field back to a higher energy state would require inconceivable amounts of energy, and have to be applied across the entire universe. Not only is this impossible, but also annoyingly prevents its use for local galactic travel.

Or maybe a technically very advanced civilization could keep its solar system inflated by the time of a deflation of the whole universe

I assume you mean contraction, as opposed to the current expansion that we see today due to dark energy. Again this would be unfeasible due to the reasons outlined above, and if contraction was to proceed to it's conclusion, i.e. a singularity like the Big Bang, then no information from this universe could be carried through that singularity, even if there was another universe on the other side.

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  • $\begingroup$ Thank you so much for your answer. Probably the field can not be influenced locally, how small the local space might be? What a pity. And no, I did not think of contraction caused by gravity in a not forever expanding universe, I thought about a collapse of the inflaton field and space itself shrinking, how far in time away from today that may happen. It seems foolish to write such things, but stackexchange is a wonderful place where you can ask questions out of couriousity without bothering the author of a book. $\endgroup$
    – Keks Dose
    May 12, 2015 at 15:57
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Cosmological deflation is part of the energy conservation laws of the universe. Consider the idea that the universe started from a large singularity rather than from a small singularity. There are large singularities such as a Bose Einstein condensate singularity with a functional framework that gives rise to both inflation and deflation in an energy conservation process that means that the laws of thermodynamics are not violated as in the current Big Bang theory, where things arise from nothing. In this case the nothingness is a structure that cannot be measured without destroying it. So by measuring the singularity one creates an observable universe that is a functional model of our existing universe. Gravity provides the evidence that deflation occurred at the same time as inflation to create a energy conservation process that maintains balance through a duality of dark energy and dark matter.

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  • $\begingroup$ I've removed your signature (we don't do that here) I don't think this answer actually makes much sense, at very least you are using words like "singularity" or "inflation" to mean something quite different from their normal sense. I suspect that your invocation of energy conservation is not correct, or at best rather meaningless. $\endgroup$
    – James K
    Nov 19, 2023 at 22:06
  • $\begingroup$ There is no need for the entire universe to conserve energy. (That's not to say that it doesn't, but it isn't a given). $\endgroup$
    – ProfRob
    Nov 20, 2023 at 12:46
  • $\begingroup$ The conservation of energy is a feature of a biological system. If the universe is not a biological closed system then I would still think that it is a fundamental law that the universe obeys energy conservation rules just as it obeys anti-entropic properties associated with biological organisation. Features of atomic structure clearly provide the basis for inverse square law energy conservation rules observed at Planck scale. The lack of conservation of energy is merely a lack of understanding of the entire system with respect to dark energy and dark matter. $\endgroup$ Nov 20, 2023 at 23:51
  • $\begingroup$ Bose-Einstein condensate is no singularity $\endgroup$ Nov 26, 2023 at 3:09

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