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Ref: CCC-predicted low-variance circles in CMB sky and LCDM

To all cosmology / theoretical physics / related or similar researchers and academics,

Are there some updates concerning the issue of these concentric circles observed in the CBM in view of the new Planck data? What do the new Planck data mean for the particular issues discussed in the paper?

Warmest gratitude in advance.

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This is very close to being a good question; the only thing wrong with it is that "I humbly solicit your view/s on the above-mentioned paper" is not a question. In any case I don't feel so bad about doing this now that the "question" has gotten some answers. –  David Z May 19 '11 at 18:09
    
@Qmechanic I made the question more focused on physic than inviting discussions. Can it be reopend now? –  Dilaton May 31 '13 at 10:59
    
It is worth noting that the authors have a later pre-print with the same title that was published (which the earlier one was not). Presumably you should look at the differences. In any case, I think the question remains "overly broad": you seem to ask does anyone have anything to say about this paper. –  dmckee May 31 '13 at 16:56
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closed as not a real question by David Z May 19 '11 at 18:06

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

3 Answers

Especially one of the authors is famous but the research of these CMB circles produced before the Big Bang resembles the research of crop circles produced by extraterrestrial aliens. In reality, the actual number of such "strong enough circles" is exactly what the statistical predictions based on standard cosmological models predict. It has to be so.

The authors have posted several papers with almost the same content and they're slightly changing the message. For example, in the newest paper you mentioned, they try to place their "new effects" in the large-$L$ region (low angular separation or apparent radii of the circles).

However, the fundamental flawed content remains unchanged. It's a simple mathematical fact that the excess of arbitrary spherically symmetric "special patterns" that can be described by a quadratic score $$\int d \theta_1 d\phi_1\, d\theta_2 d\phi_2 K(\theta_1,\phi_1,\theta_2,\phi_2) \Delta T(\theta_1,\phi_1)\Delta T(\theta_2,\phi_2)$$ and the Penrose-Gurzadyan "concentric circles" surely belong to this category (they haven't studied any non-Gaussianities, and even if they had, none of them are detectable in the measured WMAP spectrum as of today, anyway) - is inevitably included in the power spectrum as a function of $L$. For a simple proof, see

http://motls.blogspot.com/2010/12/why-penrose-and-gurzadyan-cannot-see.html

The kernel of their quadratic score $K(\hat n_1,\hat n_2)$ may be expressed as an operator acting on functions of $S^2$, the celestial two-sphere, and if this operator (e.g. if their rule to detect circles) is spherically symmetric, it has to be a function of $L^2$ only which means that this whole operator may be fully described by the eigenvalues it has when acting on $L^2$ eigenstates. In other words, it is fully encoded in the WMAP spectrum as a function of $L$.

enter image description here

The WMAP spectral curve knows everything about the abundance of arbitrary patterns as long as this abundance may be described by a spherically symmetric score that is bilinear in $\Delta T$.

So one doesn't have to look at the particular data to be sure that the authors are misleading themselves. What they write about the excess, relatively to the predictions of the famous WMAP curve included on the picture above, is as impossible as $2+2=5$.

Before I admitted to myself that such famous authors (or one of them) could be ignorant about basic methods linked to the spherical harmonics, I wrote two texts speculating that they rediscovered something that is actually valid. One of them was:

http://motls.blogspot.com/2010/11/what-penrose-and-gurzadyan-have.html

But I no longer think that the article above is relevant. Their methodology is way too rough and unrefined for them to rediscover the things I thought that they rediscovered.

As long as one defines the "score" quantifying the number of concentric circles with various properties in terms of squared temperature differences in various pairs of the skies, this "score" is fully included in the WMAP spectrum that depends on $L$, and because this spectrum beautifully agrees with the predictions of the LCDM standard cosmological model, there's no room for some "improvements".

Independently of this basic mistake, I am surprised how incredibly superficial analysis they want to be making. They just want to answer the question "too many concentric circles Yes/No", and moreover, they give a wrong "Yes" answer to this question (by cherry-picking and irrationally overemphasizing some vaguely defined circles they like, without doing a proper statistical scrutiny of well-defined properties of the WMAP maps). Meanwhile, proper cosmology is predicting and testing whole detailed functions of $L$ with many bumps etc. - something that they're extremely far from addressing. The idea that they could compete with the standard cosmological model, without saying iota of valid things about the WMAP spectral curve, is preposterous.

Also, the mechanism of the proposed cyclic cosmology couldn't work to produce the alleged patterns. Incredibly enough, the main mistake that Penrose et al. do is a wrong Penrose diagram (note that the same name appears twice) for a Big Bang Cosmology. There can't be any "non-inflating" cosmology that has this big volume "before the Big Bang". If one wants to extend the diagram in this way, it's inevitable to include some very fast expansion of space that is inflation - at least when it comes to its consequences for the spacetime geometry. One should then ask what this inflation-like evolution of the geometry was caused by. And all known legitimate solutions are "morally" versions of inflation; it has to be so. I discussed these matters here:

http://motls.blogspot.com/2010/11/penroses-ccc-cosmology-is-either.html

So in my opinion, the authors have to get a failing grade in modern cosmology. Moreover, I am somewhat afraid that especially Penrose has to have understood the spherical harmonics calculus by now and he's defending the indefensible partly in order to promote a popular book he no longer wants to scratch (even though an honest scientist definitely should) - and this book is based on similarly incorrect statements.

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soft question hard answer. +1 –  anna v May 14 '11 at 13:44
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Thanks, Anna, but your +1 was only at the level of words, not buttons. ;-) –  Luboš Motl May 14 '11 at 15:44
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I'll gladly give you an actual +1. A highly impressive and convincing tirade. –  qftme May 14 '11 at 17:20
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@Luboš: Sadly I have to admit not to be able to follow your argumentation. Nevertheless this is not your fault and I want to point out that I greatly appreciate that you have the guts to argue against one of the bigshots. This is something entirely missing for a lot of scientists atm since they fear the response. But isn't this the way science should be - an honest and non-political discussion? Thumbs up –  Robert Filter May 15 '11 at 11:12
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Thanks a lot for these words. Robert. I could have made it more comprehensible but it would require lots of optimizations. Yes, people are bounded by so many sociological constraints and groupthink. In fact, one can't even learn that in the privacy of their offices, everyone knows that e.g. these papers by Penrose and Gurzadyan are wrong. But everyone chooses not to say it - because Penrose is a popular and famous chap and no one wants to stand against popular things. –  Luboš Motl May 16 '11 at 6:15
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It's very easy to go wrong in analyzing microwave background maps for this sort of signal. In particular, unless you're quite used to doing this sort of analysis, it's easy to make mistakes in calculating the probability of getting a false positive -- that is, of seeing patterns like the ones you're looking for, even if the standard model is correct.

I haven't reproduced the calculations myself (although I've done a number of very similar analyses in the past), but I have read papers by various other people arguing that the original result was incorrect. All of these papers present very clear and cogent explanations of the correct way to do this analysis and point out errors in the original analysis, which would have precisely the effect of inflating the statistical significance (by reducing the computed false-positive probability). Moreover, the rebuttals are written by people with extensive experience doing this sort of analysis, while the original paper was written by people with no such experience.

I conclude that there's no convincing evidence in support of the Gurzadyan-Penrose model. As far as I can tell, there's essentially complete consensus among experts in the field that this is the correct conclusion.

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Since the first paper that I associate the circles with the voids.
in the paper, about Fig 4

The distortions could be the result of ... or more likely, ...Indeed, the presence of giant voids could particularly influence such images Gurzadyan V.G., Kocharyan A.A. (2009)

The concentric features reminds me a X-ray crystal diffraction pattern. It can trace a spatial volumetric regularity present in the creation of the photons of the CMB.
goggle for images of "X-ray crystal" and compare with Figs 4 and 5.
I think that this viewpoint is not allowed by the current mainstream cosmological model.
If you want to understand what it can trace, or not, one must ignore any preconceived model and start with the data analisys and discover if it was properly done, and then answer to the question: can it trace a volumetric regularity ?
If the answer is 'yes' or a 'may be' I can assure that a cosmological model already exists.
(not the CCC one)

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