Recent Blogs Posts

  1. Deep Sky This Month - May 2018

    by , 04-14-2018 at 12:42 PM
    Normally I would say welcome to May and a new edition of the DSTM. However given the larger scale and complexity of this edition, I am releasing it earlier so that folks can take advantage of the dark cycle in April as well.

    This time of year the attention of many observers is focused on galaxies. The coming of spring in the north and autumn in the south has become known as galaxy season because of the favorable placement of the Virgo Galaxy Cluster. Of course galaxies are in such ...

    Updated 04-14-2018 at 03:27 PM by KT4HX

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  2. A new approach to quantum gravity that is interesting

    by , 04-13-2018 at 03:30 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    https://arxiv.org/abs/1804.03846

    Aw heck. I'll include the abstract even though it's mostly techie talk:

    Starting from a parameterisation of the quantum effective action for gravity we calculate correlation functions for observable quantities. The resulting templates allow to reverse-engineer the couplings describing the effective dynamics from the correlation functions. Applying this new formalism to the autocorrelation function of spatial volume fluctuations measured
    ...
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  3. reanalysis suggests that DM may be 3-5% neutrinos

    by , 04-09-2018 at 03:11 AM
    Quote Originally Posted by not_Fritz_Argelander View Post
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  4. Why alternative gravity is a bad bet to solve the Dark Matter problem.

    by , 04-08-2018 at 05:54 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    It is too complicated to make it work to fit the observations is the answer. "Human proposes, Nature disposes" of the theories that are bad. Nature is providing abundant hints that alternative gravity as a solution to DM is not a good idea. Here is a spreadsheet in which I track 16 different tests of DM versus alternative gravity attempts to sweep it aside.

    Dark Matter Status.xls
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  5. Deep Sky This Month - April 2018 (Northern)

    by , 04-01-2018 at 01:52 PM
    April showers bring May flowers. This saying is as old as the hills, but does contain more than a modicum of truth. But April also brings spring galaxies galore. It is easy to get wrapped up in the galaxy fields of Leo and Virgo, but we’re not going to do that here. Above the back of Leo is an oft forgotten constellation, the little lion. Leo Minor isn’t a bright or large constellation, as it is number 64 of the 88 in terms of area. Nor does it have any Messier objects, unlike its big brother ...
    Attached Thumbnails Attached Thumbnails How many times better is the angular resolution of 50mm binoculars compared-ngc-3344_mag-12.jpg   How many times better is the angular resolution of 50mm binoculars compared-ngc-3432_mag-12.jpg  
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