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Thread: Dr H on the status of inflation

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    Default Dr H on the status of inflation



    Backreaction: Inflation: Status Update

    The fact that the Higgs boson could well be inflation's 'inflaton' is not addressed and is something that could remove the objections listed.
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    Default Re: Dr H on the status of inflation

    In the final analysis, nobody REALLY knows for sure. It's all theory. We may never know. Bill
    Burris

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    Default Re: Dr H on the status of inflation

    Quote Originally Posted by burris View Post
    In the final analysis, nobody REALLY knows for sure. It's all theory. We may never know. Bill
    No, I'm sorry but "It's all theory" is just plain dead wrong. Inflation makes definite predictions which are confirmed by observation. The flatness of the universe and uniformity of the CMB are things correctly predicted by inflation that a Big Bang without inflation fails utterly to predict.

    https://en.m.wikipedia.org/wiki/Inflation_(cosmology)
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    Default Re: Dr H on the status of inflation

    PS To clarify..... A "plain vanilla" Big Bang is falsified by CMB uniformity and flatness so a Big Bang model with inflation survives the tests. One can also have CMB uniformity and flatness in a Big Bounce cosmology. The Big Bounce is also testable as described in this technical treatment.

    https://www.researchgate.net/publica...A_Brief_Review

    The tests involve measuring DM mass and interaction cross section and weirdness in the thermal history of same.

    In addition I recall but cannot quickly locate a discussion where SMBHs survive the Bounce. So finding SMBHs way too early would indicate Big Bounce rather than Inflationary Big Bang.
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    Default Re: Dr H on the status of inflation

    Thank you for the extra reading, greatly appreciated
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    Default Re: Dr H on the status of inflation

    Quote Originally Posted by Gabby76 View Post
    Thank you for the extra reading, greatly appreciated
    You're welcome. If there's a desire for a deeper dive on the interesting link in post #4 ..... Can try but can't promise since I'm fully engaged in packing and moving logistics.
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    Default Re: Dr H on the status of inflation

    Between work and reading/ rereading there is no hurry When you have time.
    Packing is more important anyways!
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    Default Re: Dr H on the status of inflation

    Quote Originally Posted by not_Fritz_Argelander View Post
    PS To clarify..... A "plain vanilla" Big Bang is falsified by CMB uniformity and flatness so a Big Bang model with inflation survives the tests. One can also have CMB uniformity and flatness in a Big Bounce cosmology. The Big Bounce is also testable as described in this technical treatment.

    https://www.researchgate.net/publica...A_Brief_Review

    The tests involve measuring DM mass and interaction cross section and weirdness in the thermal history of same.

    In addition I recall but cannot quickly locate a discussion where SMBHs survive the Bounce. So finding SMBHs way too early would indicate Big Bounce rather than Inflationary Big Bang.
    This is a charming little paper, which is much easier to read on a laptop than a mobile device.

    It’s not brilliant but is quite workmanlike and well done.

    The key insight is that the fraction of the universe that is in dark matter has different dependencies on the DM particle interaction cross section and mass.

    In the Standard Cosmology (inflation) the interaction cross section is fixed and independent of the DM particle mass. So the interaction cross section is fixed and independent of DM particle mass.

    In the Big Bounce without inflation the interaction cross section has to decrease as the inverse mass squared. If the DM particle is sufficiently massive its interaction cross section would have to be too small to be detected with terrestrial experiments. (It eventually gets to be below the cosmic neutrino background and undetectable.)

    It is tempting (the authors fail to be tempted, so this is just me) to see the failure of DM searches at the LHC as indicating indirect evidence for Bounce rather than Bang. As the parameter space gets searched more rigorously this firms up.

    Anyway a direct laboratory detection of a DM particle would enable deciding between an Inflationary Big Bang and a Big Bounce cosmology. Definitively. So a decision is possible in principle.

    One other entertaining feature is that the Big Bounce provides pathways for non-equilibrium production of particles. So, me again, this might provide the time reversal symmetry breaking that can explain the matter-antimatter asymmetry?

    I have to leave it there. Love the paper. I’m going to blog it and come back to it later but there is no way to do this justice with the limited time I have available.

    Again, "theoretical" is a good thing. The idea that experimental data is superior to theoretical insight is simply false. Everything we know "for sure" is "theoretical". Bad theories get weeded out by Nature. You don't even know what data to collect without a theory.

    "Man proposes, Nature disposes".
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    Default Re: Dr H on the status of inflation

    Let me add a little clarification. On rereading the post this addition might be needed.....

    Quote Originally Posted by not_Fritz_Argelander View Post

    The key insight is that the fraction of the universe that is in dark matter has different dependencies on the DM particle interaction cross section and mass.

    In the Standard Cosmology (inflation) the interaction cross section is fixed and independent of the DM particle mass. So the interaction cross section is fixed and independent of DM particle mass.
    The interaction cross section that gives the observed fractional abundance of DM is a constant independent of DM particle mass is more clear.

    In the Big Bounce without inflation the interaction cross section has to decrease as the inverse mass squared. If the DM particle is sufficiently massive its interaction cross section would have to be too small to be detected with terrestrial experiments. (It eventually gets to be below the cosmic neutrino background and undetectable.)
    But for Big Bounce the observed mass fraction of DM is constrained to lie on a curve in particle mass - cross section such that the observed mass fraction is proportional to the cross section and inversely proportional to the square of the particle mass.

    The Inflationary Big Bang curve and Big Bounce curve are easily separated so a lab detection, necessarily involving measuring a cross section and a mass, will falsify one or the other idea. If we are REALLY lucky both can be falsified and we'll have an opportunity to learn something new!
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