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I await your commentary on the SALT2 calibration mechanism. This is the point where bias is introduced. The supernovae light curve data was biased before any an
by sahil50 5y ago
I await your commentary on the SALT2 calibration mechanism. This is the point where bias is introduced. The supernovae light curve data was biased before any analysis made.
- pfdietz 5y agoThis doesn't appear anywhere in the link from the link I provided for the SN light curves. https://arxiv.org/abs/astro-ph/0104382 https://arxiv.org/abs/astro-ph/0104382
- sahil50 5y agoThanks for linking. So this paper is from 2001. Whereas SALT2 is from 2007. https://www.aanda.org/articles/aa/pdf/2007/16/aa6930-06.pdf https://www.aanda.org/articles/aa/pdf/2007/16/aa6930-06.pdf This 2001 paper uses a correction template that I think is a v1 of what SALT2 is. SALT2 probably is an "improvement" on this template, so I think by identifying a problem in SALT2, I have adequate (but not 100%) reason to think this template introduces the same bias.
- pfdietz 5y agoThe current work on SN cosmology is making subtle measurements to try to determine difficult to measure properties of the expansion of the universe, using SN at high red shift. Tired light is easily killed without all that, using data available decades ago, at z < 1. And this doesn't require estimation of the absolute luminosity of the SN.
- sahil50 5y agoWhy are you bringing up something else? Awaiting your commentary on the big 3 rebuttals of tired light, and the rebuttals of those rebuttals.
- gliptic 5y agoIt's you bringing up something else. SALT2 is a red-herring.
- sahil50 5y agoNow that's false. The point is that the data calibration mechanism introduces bias before any analysis has been made. The data is calibrated to assume galactic recession. That's the problem.
- pfdietz 5y agoThe point of SALT2 was better models for calculating the brightness of SN, so their distance could be calculated. This is necessary for detecting subtle changes in the expansion rate of the universe. Killing tired light doesn't require any of this. What the paper I cited did was plot the redshift vs. the rise and fall times of the light curves. This doesn't depend at all on the overall brightness of the SN. There is no need to estimate this brightness. In tired light, the result curve will be flat; in the standard cosmology it will not be. And the observations were inconsistent with tired light at 10 standard deviations, killing the theory. The SALT2 stuff you're pointing to is indeed a total red herring. I get the feeling you're just pretending to understand all this stuff you're pointing to, for some reason.
- sahil50 5y agoCrawford addresses what you're saying in this paper. https://arxiv.org/abs/1711.11237 https://arxiv.org/abs/1711.11237
- sahil50 5y agoConsidering all the redshift data we have, galactic recession does not fit. Rough calculations https://docs.google.com/spreadsheets/d/1HI61-pDIzzSItw48K0gar1pEt2xsA9cfF9EOy511G8w https://docs.google.com/spreadsheets/d/1HI61-pDIzzSItw48K0ga... Data from https://ned.ipac.caltech.edu/Library/Distances/ https://ned.ipac.caltech.edu/Library/Distances/