Is Dark Matter Needed in Galaxies?

Rozgacheva, I. K.; Agapov, Aleksei

doi:10.1134/s106377291809007x

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…Astrophysicists and cosmologists introduced the dark matter, and then the dark energy, to explain the characteristics of the rotation curves of galaxies, the stability of galactic disks, the growth of large-scale structures in the early universe, the Hubble parameter (accelerated expansion of space), and the anisotropy of the CMB radiation. Here these problems will not be discussed; but some relevant publications are given in [3]. So far, the "dark sector" methodology could not provide a satisfactory explanation of these problems because of the large variety of dark energy and dark matter models.…”

Section: Introductionmentioning

confidence: 99%

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Do Fractals Confirm the General Theory of Relativity?

Rozgacheva

2019

Symmetry

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The relatively high abundance of fractal properties of complex systems on Earth and in space is considered an argument in support of the general relativity of the geometric theory of gravity. The fractality may be called the fractal symmetry of physical interactions providing self-similarities of complex systems. Fractal symmetry is discrete. A class of geometric solutions of the general relativity equations for a complex scalar field is offered. This class allows analogy to spatial fractals in large-scale structures of the universe due to its invariance with respect to the discrete scale transformation of the interval d s ↔ q d s ˜ . The method of constructing such solutions is described. As an application, the treatment of spatial variations of the Hubble constant H 0 H S T (Riess et al., 2016) is considered. It is noted that the values H 0 H S T form an almost fractal set. It has been shown that: a) the variation H 0 H S T may be connected with the local gravitational perturbations of the space-time metrics in the vicinity of the galaxies containing Cepheids and supernovae selected for measurements; b) the value of the variation H 0 H S T can be a consequence of variations in the space-time metric on the outskirts of the local supercluster, and their self-similarity indicates the fractal distribution of matter in this region.

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Section: Introductionmentioning

confidence: 99%

“…In work [3], facts indicating that the dark matter hypothesis is groundless from the point of view of the interpretation of the observations are given. Galaxies and clusters of galaxies are located inside the cosmic web.…”

Section: Introductionmentioning

confidence: 99%

Do Fractals Confirm the General Theory of Relativity?

Rozgacheva

2019

Symmetry

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Dark matter and motion of bodies in space

Ryabushko

Zhur

2022

Vescì Akademìì navuk Belarusì. Seryâ fizika-matematyčnyh navuk

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This paper investigates the degree of influence of the gravitational field of dark matter on the laws of motion of bodies in a medium in a restricted two-body problem, when a test body (planet, asteroid, artificial satellite of a star, in particular, the Sun, etc.) has its own rotation, i. e. own angular momentum impulse. The study was carried out within the framework of the post-Newtonian approximation of the general theory of relativity. In accordance with the latest experimental data, hypotheses about the average densities of dark matter ρD.M. and visible matter ρvis. in planetary systems are accepted. In particular, in the Solar system the following is accepted: ρD.M ≈ 2,8 · 10–19 g · cm–3, ρvis ≈ 3 · 10–20 g · cm–3 and ρΣ = ρvis + ρD.M ≈ 3,1 · 10–19 g · cm–3. In the post-Newtonian approximation of the general theory of relativity, the equation for the trajectory of a rotating test body with respect to ρΣ is derived, and working formulas are obtained that give the laws of secular changes in the direction of the vector of the proper angular momentum impulse of the test body and the modulus of this vector. It is shown that accounting ρD.M changes the magnitude of the periastron shift. For example, in the Solar System when taking into account ρvis, all the planets except Pluto have a directly shifted perihelion in the post-Newtonian approximation of the general theory of relativity. When taking into account ρΣ the planets from Mercury to Saturn included, they have a direct shift of perihelion, and Uranus, Neptune, Pluto have the reverse (against the planets in orbit). There is also a secular change in the eccentricity of the orbit. The formula is derived that can be used to calculate the secular deviation of the translational motion of a rotating body from motion in a plane. Accounting ρΣ enhances deviation. It is emphasized that all the noted effects for planetary systems in the vicinity of neutron stars, radio pulsars and other dense objects can be many orders of magnitude greater than in the solar system.

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Is Dark Matter Needed in Galaxies?

Cited by 2 publications

References 29 publications

Do Fractals Confirm the General Theory of Relativity?

Do Fractals Confirm the General Theory of Relativity?

Dark matter and motion of bodies in space

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