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  1. Introducing myself: John Baars, Set up

    by , 05-01-2018 at 06:01 PM
    Quote Originally Posted by John Baars View Post
    The setup of my two main instruments:
    - An old Vixen GPDX mount with Skysensor 2000 on a pier in the backyard. Pier and mount stay outdoors under a cover.

    For the Vixen 102ED f/9 ( 1990-ties) Updated (and recoated) by an Dutch optician to 1/7 P/V wavefront
    A Baader Zeiss 1,25" prism is used. Details of low altitude planets and doubles are increased with a ASH Atmospheric Dispersion Corrector. Works well on doubles too!

    -TS 50mm finder with rotatable
    ...
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  2. 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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    Deep Sky This Month
  3. 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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  4. 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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  5. 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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