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Thread: Cosmology

  1. #1081
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    I can see how that would be the case because the divine is "one", but other cultures may use other names and practices to approach the one divine. Although I don't think Christianity is the "only" way to the divine Christianity is still "a" way to the divine and there is no need to convert to something better.

  2. #1082
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    I have been re-reading John Moffat's "Reinventing Gravity". I am at the part about his theory of the variable speed of light at the beginning of the universe. He rejects the various inflation theories and adjusts Einstein's special relativity so that the speed of light is not a constant. This allows for the universe to be homogeneous without invoking inflation.

    One of the ideas that I found interesting is the idea of a "bimetric" separating the speed of light from the speed of gravitational waves. These two would vary between themselves to avoid inflation in a different way from the variable speed of light theory he originated above. Generally it is believed that there is one metric, the speed of light, which is constant and gravitational waves travel at the speed of light.

  3. #1083
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    Moffat mentioned that he is not the only one who has promoted the variable speed of light in a vacuum as an alternative to inflation to get the universe into a homogeneous state. More generally the variable speed of light in a vacuum has been considered by others. Here is a survey of these ideas: https://en.wikipedia.org/wiki/Variable_speed_of_light

  4. #1084
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    I just came across another survey article at a deeper level than the Wikipedia article by Jo˜ao Magueijo who Moffat mentioned. It was written in 2003, older than the Moffat summary I am reading written in 2009: http://cds.cern.ch/record/618057/files/0305457.pdf

    Also it looks like a test of this may be underway perhaps to complete in the next five years with improved measurements of the "spectral index" for which they made a prediction based on their theory: https://www.theguardian.com/science/...soon-be-tested This article is less than a year old.

  5. #1085
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    I have nearly completed a second reading of Moffit's book. I've come to realize that there are many people who are looking for modified gravity theories because dark matter has so far not been found. One has to do one or the other: modify the gravity theory or find dark stuff.

    One blog I found interesting was Sabine Hossenfelder's http://backreaction.blogspot.de/2015...ith-black.html Here is the archive header for the paper she references: https://arxiv.org/abs/1502.01677 The Event Horizon Telescope may be a way to falsify either Einstein's general relativity or Moffit's MOG. Here is an update of the project: http://eventhorizontelescope.org/blog/eht-update

  6. #1086
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    I found out that John Moffat has a more recent book (2014) on the Higgs boson and it is in a local library. He writes very well. Maybe he'll help me figure out what that boson is.

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