A research study by the University of Bonn: Observations fit inadequately with the Standard Model of Cosmology.
The Standard Model of Cosmology describes how the universe entered into being according to the view of the majority of physicists. Researchers at the University of Bonn have now studied the development of galaxies within this design, discovering considerable disparities with actual observations. The University of St. Andrews in Scotland and Charles University in the Czech Republic were also associated with the study. The outcomes have actually now been released in the Astrophysical Journal.
Most galaxies noticeable from Earth resemble a flat disk with a thickened. This is because in the model, every galaxy is surrounded by a halo of dark matter. “Thats why we keep seeing galaxies combining with each other in the design universe,” explains Prof. Dr. Pavel Kroupa of the Helmholtz Institute for Radiation and Nuclear Physics at the University of Bonn
Prof. Dr. Pavel Kroupa (left) and Moritz Haslbauer (ideal) with a forecast of the Andromeda galaxy. Credit: Volker Lannert/University of Bonn.
This crash has two effects, the physicist discusses: “First, the galaxies penetrate at the same time, destroying the disk shape. Second, it minimizes the angular momentum of the brand-new galaxy produced by the merger.” In other words, this greatly decreases its rotational speed. The rotating movement typically makes sure that the centrifugal forces acting throughout this procedure trigger a brand-new disk to form. However, if the angular momentum is too little, a brand-new disk will not form at all.
Large inconsistency between forecast and reality
In the existing research study, Kroupas doctoral student, Moritz Haslbauer, led a worldwide research group to investigate the advancement of deep space using the newest supercomputer simulations. If this theory were proper, the estimations are based on the Standard Model of Cosmology; they reveal which galaxies ought to have formed by today. The researchers then compared their results with what is currently most likely the most accurate observational data of the real Universe noticeable from Earth.
It may for that reason be that the number of disk galaxies that would form in the Standard Model of Cosmology has actually been undervalued. “However, even if we take this effect into account, there remains a major difference between theory and observation that can not be remedied”, Haslbauer points out.
According to the so-called MOND theory (the acronym stands for “MilgrOmiaN Dynamics), galaxies do not grow by combining with each other. In a MOND universe, galaxies also grow by taking in gas from their surroundings. Mergers of mature galaxies are uncommon in MOND.
Challenge for the Standard Model
The exact systems of galaxy growth are not yet completely comprehended, even with MOND. “Nevertheless, the MOND theory fixes all known extragalactic cosmological problems in spite of being originally created to attend to galaxies just,” says Dr. Indranil Banik, who was included in this research.
Referral: “The High Fraction of Thin Disk Galaxies Continues to Challenge ΛCDM Cosmology” by Moritz Haslbauer, Indranil Banik, Pavel Kroupa, Nils Wittenburg and Behnam Javanmardi, 4 February 2022, Astrophysical Journal.DOI: 10.3847/ 1538-4357/ ac46ac.
Researchers at the University of Bonn have now studied the development of galaxies within this design, discovering significant discrepancies with actual observations. “Thats why we keep seeing galaxies combining with each other in the design universe,” explains Prof. Dr. Pavel Kroupa of the Helmholtz Institute for Radiation and Nuclear Physics at the University of Bonn
The calculations are based on the Standard Model of Cosmology; they show which galaxies must have formed by today if this theory were correct. It may therefore be that the number of disk galaxies that would form in the Standard Model of Cosmology has been undervalued. “Nevertheless, the MOND theory solves all recognized extragalactic cosmological problems despite being initially formulated to deal with galaxies just,” states Dr. Indranil Banik, who was included in this research study.
