Non-comoving cold dark matter in a $$\varLambda $$ Λ CDM background
In: European Physical Journal C: Particles and Fields, Jg. 81 (2021), Heft 4, S. 1-14
Online
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Zugriff:
We examine the evolution of peculiar velocities of cold dark matter (CDM) in localized arrays of inhomogeneous cosmic structures in a $\Lambda$CDM background that can be identified as a frame comoving with the Cosmic Microwave (CMB). These arrays are constructed by smoothly matching to this cosmological background regions of Szekeres-II models whose source is an imperfect fluid reinterpreted as non-comoving dust, keeping only first order terms in $v/c$. Considering a single Szekeres-II region matched along two comoving interfaces to a $\Lambda$CDM background, the magnitudes of peculiar velocities within this region are compatible with values reported in the literature, while the present day Hubble expansion scalar differs from that of the $\Lambda$CDM background value by a 10\% factor, a result that might provide useful information to the ongoing debate on the $H_0$ tension. While the models cannot describe the virialization process, we show through a representative example that structures of galactic cluster mass reach the onset of this process at redshifts around $z\sim 3$.
Comment: 15 pages, 8 figures
Titel: |
Non-comoving cold dark matter in a $$\varLambda $$ Λ CDM background
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Autor/in / Beteiligte Person: | Nájera, Sebastián ; Sussman, Roberto A. |
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Zeitschrift: | European Physical Journal C: Particles and Fields, Jg. 81 (2021), Heft 4, S. 1-14 |
Veröffentlichung: | SpringerOpen, 2021 |
Medientyp: | unknown |
ISSN: | 1434-6052 (print) ; 1434-6044 (print) |
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