fredag 16 december 2011

Is the Cosmological Principle Valid?

I have written a new post on The World as Computation:
Upplagd av kl.
Etiketter:

9 kommentarer:

  1. Dol16 december 2011 kl. 14:12

    Can you point to a place where it is stated that the Big Bang event is localized in some preexisting space?

    To my knowledge you can't backtrack the classical model to the singularity.

    Further the Friedman-Robertson-Walker metric isn't solved as an initial problem. You input the isotropical homogeneous background as input in Einsteins equations and the solution is the FRW metric.

    Sincerely,
    Dol

    SvaraRadera
  2. Claes Johnson16 december 2011 kl. 15:17

    Still I cannot see much evidence of homogeneity. Can you?

    SvaraRadera
  3. Dol16 december 2011 kl. 15:23

    What do you mean?

    Are the empirical large scale observations of a homogeneous mass distribution in the universe wrong?

    Please present the measurement that contradicts this.

    Sincerely,
    Dol

    SvaraRadera
  4. Dol16 december 2011 kl. 15:25

    "Further the Friedman-Robertson-Walker metric isn't solved as an initial problem. "

    I meant of course the FRW-cosmology, not metric, here...

    /Dol

    SvaraRadera
  5. Claes Johnson16 december 2011 kl. 17:13

    The Nobel Prize was awarded for observations showing inhomogeneity.

    SvaraRadera
  6. Anonym16 december 2011 kl. 18:12

    Do you men the price where it was shown that the CMB is extremely homogeneous and only anisotropic on a really small scale?

    SvaraRadera
  7. Claes Johnson16 december 2011 kl. 19:20

    CMB is one thing, mass distribution and velocity another.

    SvaraRadera
  8. Anonym16 december 2011 kl. 20:39

    Then please be more specific what you mean.

    Isn't the anisotropy connected with the CMB.

    This years Nobel price concerns a cosmology that's homogeneous and isotropic on the largest scales, that is consistent with the cosmological principle, doesn't it?

    Or where do you mean that the anisotropy takes place?

    SvaraRadera
  9. Claes Johnson16 december 2011 kl. 21:14

    The Nobel Prize is awarded to the observation that CP without dark energy is not valid. Instead of insisting on dark energy of which nothing is known, it seems to me more rational to give up CP. There cannot be direct evidenece of CP because observations from other points than the Earth are missing.

    SvaraRadera

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