Pavel Kroupa: The Dark Matter Crisis

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Dark Matter Problems, Cosmology and Progress: a personal account

Falsification of the dark-matter hypothesis:

12th November 2013, Heidelberg Joint Colloquium: The vast polar structures around the Milky Way and Andromeda, and the implications thereof for fundamental physics.

See also the published papers:
Local-Group tests of dark-matter concordance cosmology. Towards a new paradigm for structure formation y [Kroupa et al., 2010],
The Dark Matter Crisis: Falsification of the Current Standard Model of Cosmology [Kroupa, 2012],
Lessons from the Local Group (and beyond) on dark matter [Kroupa, 2014],
Galaxies as simple dynamical systems: observational data disfavor dark matter and stochastic star formation [Kroupa, 2015].
The observed spatial distribution of matter on scales ranging from 100kpc to 1Gpc is inconsistent with the standard dark-matter-based cosmological models [Kroupa, 2016].

Phantom of Ramses (PoR) code for galaxy formation and evolution in Milgromian dynamics/MOND:

With a small grant from the Rectorate of the University of Bonn PK received in 2013, Fabian Lueghausen (in collaboration with Benoit Famaey and Pavel Kroupa) was able to develop in 2014 and 2015 a patch to Romain Teyssier's RAMSES code to allow dark-matter-free high-resolution simulations of galaxy formation and evolution.
The Lueghausen, Famaey & Kroupa 2015 Phantom of Ramses (PoR) code is a patch to RAMSES. By default the patch comes with the RAMSES code whenever it is downloaded.

Independently of PoR, Candlish, Smith & Fellhauer (2015) developed RAYMOND which is also a RAMSES-based Milgromian-dynamics simulation code.

Wrong claims that standard-cosmological LCDM models can account for the observed satellite distributions:

The Bahl & Baumgardt 2014 claim that the Andromeda great plane of satellites readily occurs in LCDM models is wrong, as shown by Ibata et al. 2014 and by Pawlowski et al. 2014 , who also discuss two other recent flawed claims that the observed satellite populations are consistent with LCDM models.

The Cautun, Wang, Frenk & Sawala 2015 claim that the anti-correlation of satellite galaxies observed around many host galaxies (discovered by Ibata et al. 2014) does not exist is wrong, as shown by Ibata et al. 2015.

Close scrutiny of such claims made by the standard-cosmology teams have until now always yielded flaws in the applied analysis. Is this a result of over-motivation to demonstrate that LCDM works? In the above Ibata et al. 2015 rebuttal, the authors write in their abstract: "All these unexpected correlations strongly suggest that a substantial fraction of satellite galaxies are causally-linked in their formation and evolution.", in agreement with the conclusions reached independently elsewhere that most, if not all, dSph and UFD satellites are old tidal dwarf galaxies without particle dark matter (2012a, 2012b and 2015; see also 1997).

Links to some of my relevant research papers and the German "Spektrum der Wissenschaft" article (free of charge, "kostenfrei"):

Links to related Nature and a few other papers dealing with issues relevant to the Dark Matter Problem:

Links to reviews on Milgromian dynamics/MOND:

The Dark Matter Crisis main page on SciLogs

We document on the web, as best we can and within our spare time, the paradigm change away from the concordance or standard cold or warm dark matter based cosmological models (the LCDM or LWDM models) towards a new understanding of cosmological physics.

SciLogs contents with links:

(by Marcel Pawlowski and Pavel Kroupa)

  • Link to unrelated comments to the above contributions is here (begun in Nov.2013).

    Prof. Dr. Pavel Kroupa (University of Bonn; )

    Pavel Kroupa and Mordehai Milgrom at MGADS, Strasbourg, 29.06.2010.

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