Possible formation of ring galaxies by torus-shaped magnetic wormholes
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Regular Article - Theoretical Physics
Possible formation of ring galaxies by torus-shaped magnetic wormholes A. A. Kirillova , E. P. Savelovab Bauman Moscow State Technical University, Moscow 105005, Russian Federation
Received: 11 July 2020 / Accepted: 23 August 2020 © The Author(s) 2020
Abstract We present the hypothesis that some of ring galaxies were formed by relic magnetic torus-shaped wormholes. In the primordial plasma before the recombination magnetic fields of wormholes trap baryons whose energy is smaller than a threshold energy. They work as the Maxwell’s demons collecting baryons from the nearest (horizon size) region and thus forming clumps of baryonic matter which have the same torus-like shapes as wormhole throats. Such clumps may serve as seeds for the formation of ring galaxies and smaller objects having the ring form. Upon the recombination torus-like clumps may decay and merge. Unlike galaxies, such objects may contain less or even no dark matter in halos. However the most stringent feature of such objects is the presence of a large-scale toroidal magnetic field. We show that there are threshold values of magnetic fields which give the upper and lower boundary values for the baryon clumps in such protogalaxies.
1 Introduction The widely accepted theory of galaxy formation is based on Lambda-CDM model. The primordial inhomogeneities in dark matter develop and first form relatively small clumps of matter which eventually merge and form galaxies and groups. This picture represents the hierarchical process [1,2] and the theory is heavily based on the presence of sufficiently strong inhomogeneities in cold dark matter (δρ D M /ρ D M ∼ 10−3 at the moment of the recombination). It is rather successful and only slightly underestimates the number of thin disk galaxies in the universe. It is recognized that upon some refining it allows to reproduce the population of galaxies in our Universe. Some part of galaxies are shaped like a doughnut, the so-called ring galaxies [3,4], and may contain a hole in the a e-mail:
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middle, e.g., see the recently found giant ring galaxy (ID 5519) [5]. In fact, more than a half of disk galaxies have ring structures of different scales [4] which may also have an irregular form [6]. A large amount of the ring galaxies are accompanied by galaxies which are situated near the center of the ring. There are a lot of works which describe the formation of a ring after the inner galaxy. Firstly, it is necessary to mention the model of formation which is connected with the bar in the galaxy and describes the non-axisymmetric perturbations of the gravitational potential. The bar rotation is connected with Lindblad resonance which causes the radial perturbations of density. This approach was described by Buta and Combes [3] and further development can be found in the work of Romero-Gomez et al. [7]. Another mechanism which is quite popular in astronomical papers is connected with the fall o
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