Anthropics and Myopics

  1. marcus

    marcus 24,060
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    I wonder if this will be of any help in moving the discussion of Anthropixia and the String Landscape forward. :smile:
    Anthropics and Myopics: Conditional Probabilities and the Cosmological Constant
    Irit Maor (1), Lawrence Krauss (1,2), Glenn Starkman (1,2) ((1) CERCA, Case Western Reserve University, (2) Dept of Astronomy, CWRU)
    (Submitted on 4 Sep 2007)

    "The Anthropic Principle is claimed by many to provide a possible explanation for the observed smallness of the cosmological constant. However, correlations between the value of the cosmological constant and the existence of life can be demonstrated only under quite restrictive assumptions. Even allowing for a possible correlation, we demonstrate here that suggesting any such correlation is in fact causative is a much more subtle issue, and in general this latter claim will not be implied by the former."

    exerpt: "We thank ... Raphael Bousso for lively discussions."
    Last edited: Sep 4, 2007
  2. jcsd
  3. Myopia is about right...

    Like I *tried* to say on Woit's blog:

    From the paper:
    Finally, the correlations illuminated by anthropic reasoning imply that what we ultimately learn from anthropic arguments is that the existence of us and the existence of the observed value of Lambda do not contradict each other. That is nice, but hardly surprising.

    Yeah, maybe because the cc alone - an anthropic principle does not make.

    It’s like dumb vs. dumber when everybody is premotivated.


    In the mean time, Raphael Bousso, Maor, Krauss and Starkman all fail to recognize that a true anthropic cosmological principle *necessarily* defines a dynamical principle that would "make the landscape go away". So it will remain "the biggest failure of physicists in the last 20 years"... as David Gross would say, because you can't get to that answer from any of the motivated party's frames of reference.

    The funniest part to all of this is this:

    IF and even only IF there truly is an anthropic cosmological principle in effect, then this is defining the ToE via the reason that the parameters are constrained in the otherwise unexpected manner that is observed. Whatever we do, whatever new evidence gets discovered, and whatever we learn that supports this... let's NOT look here, at all costs.

    Modern theoretical physics has become sick entertainment.
  4. Chronos

    Chronos 10,268
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    I do not find it surprising that physics, as we know it, allows for our existence. I'm all in favor of using the anthropic principle as a humor check - theories that forbid our existence must be rejected - I'm nearly certain I exist and doubt you can persuade me to abandon that assumption.
  5. That's not a principle, it's a selection effect.
    Last edited: Sep 6, 2007
  6. I'd so love to reply to this ideologically motivated hack, but Woit is still censoring me:

    Jim Clarage (astonished biophysicist) Says:
    As I’ve posted here before, even most modern theologians would blush at such anthropocentric reasoning. It genuinely goes beyond anything Ptlolemy or any other pre-Copernican cosmologists might have guilty of about Man’s central place in the universe and its laws.

    Only if you willfully ignore the observational evidence by wrongly assuming that it necessarily will be explained away, rather than to act like an honest scientist by at least giving the smoking gun equal time:

    Does the motion of the solar system affect the microwave sky?

    LambdaCDM cosmology: how much suppression of credible evidence, and does the model really lead its competitors, using all evidence?

    Alignment and signed-intensity anomalies in WMAP data

    Extragalactic Radio Sources and the WMAP Cold Spot

    A second paper confirms that the CBR is not symmetrical, as conventional theory predicts, but is asymmetrical on both large and small scales.

    Testing Isotropy of Cosmic Microwave Background Radiation

    A third paper on this subject raises doubts that the radio radiation from our own galaxy can be so accurately subtracted from the CBR observed by WMAP that the precision claimed for CBR measurements are valid.

    Some doubts on the validity of the foreground Galactic contribution subtraction from microwave anisotropies

    Michael J. Longo, who had previously shown that there was an alignment in the direction of spin of thousands of spiral galaxies across a huge stretch of the universe, shows the same alignment for elliptical galaxies.

    The Axis of Opportunity: The Large-Scale Correlation of Elliptical Galaxies

    But when you look at CMB map, you also see that the structure that is observed, is in fact, in a weird way, correlated with the plane of the earth around the sun. Is this Copernicus coming back to haunt us? That's crazy. We're looking out at the whole universe. There's no way there should be a correlation of structure with our motion of the earth around the sun — the plane of the earth around the sun — the ecliptic. That would say we are truly the center of the universe.
    -Lawrence Krauss
  7. Chronos

    Chronos 10,268
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    A potent observation. It speaks volumes of assumptions.
  8. marcus

    marcus 24,060
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    The Krauss quotation is from
    right at the very end of the article, and it continues by laying out three possible conclusions which I will highlight, as follows:

    "The new results are either telling us that

    all of science is wrong and we're the center of the universe,

    or maybe the data is imply incorrect,

    or maybe it's telling us there's something weird about the microwave background results and that maybe, maybe there's something wrong with our theories on the larger scales.

    And of course as a theorist I'm certainly hoping it's the latter, because I want theory to be wrong, not right, because if it's wrong there's still work left for the rest of us."

    The piece in Edge is Krauss impressions after a get-together of some 20 scientists, in the Virgin Islands summer 2006, that he organized.
    Last edited: Sep 8, 2007
  9. Chronos

    Chronos 10,268
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    Topology is the long and short of it. Janna Levin has offered some interesting observations.
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