Flat galactic rotation curves from geometry in Weyl gravity

We searched for a resolution of the flat galactic rotation curve problem from geometry instead of assuming the existence of dark matter. We observed that the scale independence of the rotational velocity in the outer region of galaxies could point out to a possible existence of local scale symmetry...

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Bibliographic Details
Published in:Astrophysics and space science 2020-03, Vol.365 (3), Article 51
Main Authors: Deliduman, Cemsinan, Kaşıkçı, Oğuzhan, Yapışkan, Barış
Format: Article
Language:English
Subjects:
Astrobiology
Astronomy
Astrophysics
Astrophysics and Astroparticles
Cosmology
Curves
Dark matter
Galactic rotation
Galaxies
Geometry
Gravitation theory
Observations and Techniques
Original Article
Physics
Physics and Astronomy
Ponds
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Symmetry
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Summary:We searched for a resolution of the flat galactic rotation curve problem from geometry instead of assuming the existence of dark matter. We observed that the scale independence of the rotational velocity in the outer region of galaxies could point out to a possible existence of local scale symmetry and therefore the gravitational phenomena inside such regions should be described by the unique local scale symmetric theory, namely Weyl’s theory of gravity. We solved field equations of Weyl gravity and determined the special geometry in the outer region of galaxies. In order to understand the effective description of gravitational phenomena, we compared individual terms of so called Einstein–Weyl theory and concluded that while the outer region of galaxies are described by the Weyl term, the inner region of galaxies are described by the Einstein-Hilbert term.
ISSN:0004-640X
1572-946X
DOI:10.1007/s10509-020-03764-y