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Brief Notes from Cosmos and Elsewhere Cocorico !

  1. Cosmic explosion, but no gravitational waves.. It is under this title that, on January 16th, 2008, Physicsworld.com learns us that Ligo did not discover gravitational waves connected with the "Gamma Ray Burst" GRB070201.
    We shall appreciate all the exotic savour of this Jim Hough's comment (Glasgow University) reported by  Physicsworld.com:
    Either the source was not a coalescing binary or there is some exotic situation where the gravitational waves disappear into another dimension.
    Manifestly Jim Hough does not envisage the eventuality that the Relativity would be faulted, for the first time.

    On the absence of gravitational waves, we can make several hypotheses:

    1. The object ( GRB070201) was not a binary object. (Another atypical case?)

    2. The GRBs are not binary objects. (Why not.)

    3. Ligo is not rather sensitive to discover them. (It would amaze us, Americans know how to work)

    4. The gravitational waves are not emitted in the spectre of frequencies to which Ligo is sensitive. (Why not)

    5. The gravitational waves were absorbed in the intergalactic and interstellar environment. (Quite unlikely)

    6. The gravitational waves dont exist. (In that case, we forget the Relativity, we forget Big Bang)

    We are keen to see the suite of the observations.

Documentation:

  1. http://www.sciencedaily.com/releases/2008/01/080104095250.htm

  2. http://www.spacedaily.com/reports/LIGO_Sheds_Light_On_Cosmic_Event_999.html

  1. On Feb.11.2016, CNRS NEWS told us that Gravitational Waves were Detected   whew!  

  2. On Sept 19, 2016, Arxiv publish, under the title "The Radial Acceleration Relation in Rotationally Supported Galaxies" (Stacy S. McGaugh, Federico Lelli, James M. Schombert), a study which eliminates the hypothesis of dark matter as an explanation for the abnormal rotations observed in galaxies. .

  3. On Oct 13, 2016, the Hubble Space Telescope reveals that Observable Universe would contain 10 Times more galaxies than Previously thought. This is a conceptual shock!  
    Look at: The evolution of galaxy number density at Z < 8 and its implications. (Christopher J. Conselice et al)

  4. On Oct 21, 2016, Nature publishes (in Open Access) : Marginal evidence for cosmic acceleration from Type Ia supernovae.
    This publication, in fact, eliminates the following assumptions :  whew!  
    - The expansion acceleration.
    - The Black Energy.

  5. On avril 20, 2018, Physics APS, publie "Meetings: APS April Meeting—Cosmologists Can’t Agree on the Hubble Constant".
    (Réunions: réunion d'avril de l'APS - Les cosmologistes ne peuvent s'entendre sur la constante de Hubble).
    The discrepancy in measures of the Hubble constant, which quantifies the expansion of the Universe, has only grown in recent years. The Hubble constant  tells us the speed at which galaxies are receding from us as the Universe expands. Over the past five years, cosmologists have recognized that there is a discrepancy between different measurements of this fundamental parameter. Three speakers in a session at the April Meeting of the American Physical Society in Columbus, Ohio, discussed the status of this “crisis in cosmology.” The field has now accepted that the problem is real, and some researchers are optimistic that it could lead to important discoveries.

  6. On may 16, 2018, according to an official press release (eso1815), the ESO notice that ALMA and VLT found proves of stars formation 250 millions yearss only after the Big Bang ! https://www.eso.org/public/unitedkingdom/news/eso1815/?lang. We leave you for the conclusions.

 

Created: 01/16/08
Last release: 05/19/18

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