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More Trouble For LCDM
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More Trouble For LCDM
In article , "Robert L.
Oldershaw" writes: "The Impossibly Early Galaxy Problem" http://arxiv.org/abs/1506.01377 Tension mounts, indeed! This indicates that galaxy formation is not completely understood. If it were, of course, no-one would work on it. Remember, galaxy formation is not computed/simulated from first principles, but models and algorithms are developed in association with observations. (This does not mean, though, that they have no predictive power.) So, we can learn something from new observations! Great! |
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More Trouble For LCDM
On 6/6/15 1:07 PM, Phillip Helbig (undress to reply) wrote:
In article , "Robert L. Oldershaw" writes: "The Impossibly Early Galaxy Problem" http://arxiv.org/abs/1506.01377 Tension mounts, indeed! This indicates that galaxy formation is not completely understood. If it were, of course, no-one would work on it. Remember, galaxy formation is not computed/simulated from first principles, but models and algorithms are developed in association with observations. (This does not mean, though, that they have no predictive power.) So, we can learn something from new observations! Great! In as much as there appears to be less mass than required by law of Mass Action for observed galactic formation, perhaps one should look at the actual mass formation mechanism at BBN. The Star Collaboration is finding new particle formation mechanisms in the plasma gluon plasma. https://www.star.bnl.gov/ Richard D Saam |
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More Trouble For LCDM
On 6/6/15 1:07 PM, Phillip Helbig (undress to reply) wrote:
In article , "Robert L. Oldershaw" writes: "The Impossibly Early Galaxy Problem" http://arxiv.org/abs/1506.01377 Tension mounts, indeed! This indicates that galaxy formation is not completely understood. If it were, of course, no-one would work on it. Remember, galaxy formation is not computed/simulated from first principles, but models and algorithms are developed in association with observations. (This does not mean, though, that they have no predictive power.) So, we can learn something from new observations! Great! In as much as there appears to be less mass than required by law of Mass Action for observed galactic formation, perhaps one should look at the actual mass formation mechanism at BBN. The Star Collaboration is finding new particle formation mechanisms in the plasma gluon plasma. https://www.star.bnl.gov/ Richard D Saam |
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More Trouble For LCDM
In article ,
"Robert L. Oldershaw" writes: "The Impossibly Early Galaxy Problem" http://arxiv.org/abs/1506.01377 Key quote from the Abstract: "if halo mass to stellar mass ratios estimated at lower-redshift continue to $z \sim 6-8$..." A rather different interpretation of basically the same observational data is at: http://xxx.lanl.gov/abs/1504.00005 "An Increasing Stellar Baryon Fraction in Bright Galaxies at High Redshift" As the moderator wrote, galaxy formation, especially at high redshift, is a very active topic of current research. -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
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More Trouble For LCDM
On Friday, June 12, 2015 at 12:45:10 PM UTC-4, Steve Willner wrote:
In article , "Robert L. Oldershaw" writes: "The Impossibly Early Galaxy Problem" http://arxiv.org/abs/1506.01377 Very interesting reading: http://www.math.columbia.edu/~woit/wordpress/?p=7812 RLO Fractal Cosmology |
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More Trouble For LCDM
On Monday, June 15, 2015 at 4:30:41 PM UTC-4, Robert L. Oldershaw wrote:
Some more interesting reading in the form of a new preprint on arxiv.org. http://arxiv.org/abs/1506.09143 This paper (an Oxford group) analyzes the testability of the Inflationary Scenario and concludes that "cosmic inflation is currently difficult to falsify and thus to be construed as a scientific theory, ...". Since inflation offers possible explanations for several fundamental cosmological problems, its shaky status has important consequences for the field of cosmology. RLO Fractal Cosmology |
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More Trouble For LCDM
In article ,
"Robert L. Oldershaw" writes: Some more interesting reading in the form of a new preprint on arxiv.org. http://arxiv.org/abs/1506.09143 This paper (an Oxford group) analyzes the testability of the Inflationary Scenario and concludes that "cosmic inflation is currently difficult to falsify and thus to be construed as a scientific theory, ...". This is nothing new in many respects. The literature is full of such claims. On the other hand, I could easily cite several papers where the authors claim that essentially all is well with inflation. Yes, it's fair to say that there is not yet a consensus on the finer points, but the preprint above is nothing revolutionary. Since inflation offers possible explanations for several fundamental cosmological problems, its shaky status has important consequences for the field of cosmology. Not really. The problems are there with or without inflation. Any alternative paradigm would have to explain things such as the isotropy problem which inflation can explain. Inflation, of course, is not a single theory but more of a, shall I say, paradigm. Nevertheless, it did make a robust prediction, long before there was any hint of the observational value, and this has been confirmed. (I'm referring to the spectral index n; the confirmed prediction was n approximately but slightly less than 1.) In some sense, inflation today is like the theory of evolution before genetics. The idea was correct, but was difficult to understand in the light of the knowledge of biology at the time. |
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