Talk:Lambda-CDM model

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Plane of satellites

Latest comment: 6 months ago2 comments2 people in discussion

I need help navigating balance for information about the satellite-disk problem.

I found another reference on the Milky Way, but it is unclear how the simulation used is different from the ones that produced the satellite-disk problem.
There are claims of similar distributions of satellites around spiral galaxies beyond the Local Group, such as Centaurus A, that need to be integrated to the section.^[1]^[2]
Kanehisa et al. (2025) found that the distribution of dwarf galaxies around the Andromeda Galaxy is in strong tension with ΛCDM.^[3]

–LaundryPizza03 (d c̄) 13:38, 24 January 2026 (UTC)Reply

I think the section is ok as is for now.

The Timmer article is about:

Ibata, N. G., Ibata, R. A., Famaey, B., & Lewis, G. F. (2014). Velocity anti-correlation of diametrically opposed galaxy satellites in the low-redshift Universe. Nature, 511(7511), 563-566.
Bernal et al. (2025) has no published citations.
Kanehisa et al. (2025) has 8 citations on Google Scholar. Only one is published and it is a self-citation.

This new review written after some of the work that challenges Pawlowski's groups papers

Primack, Joel R. (September 26, 2024). "Galaxy Formation in ΛCDM Cosmology". Annual Review of Nuclear and Particle Science. 74: 173–206. doi:10.1146/annurev-nucl-102622-023052. ISSN 0163-8998.

is consistent with our content. Johnjbarton (talk) 00:51, 26 January 2026 (UTC)Reply

References

↑ Timmer, John (23 July 2014). "Mysterious orbits of dwarf galaxies found all over the nearby Universe". Ars Technica.
↑ Bernal, Tula; Matos, Tonatiuh; San.-Hernandez, Leonardo (1 January 2025). "A natural explanation of the VPOS from multistate Scalar Field Dark Matter". Journal of Cosmology and Astroparticle Physics. 2025 (01): 155. doi:10.1088/1475-7516/2025/01/155.
↑ Kanehisa, Kosuke Jamie; Pawlowski, Marcel S.; Libeskind, Noam (11 April 2025). "Andromeda's asymmetric satellite system as a challenge to cold dark matter cosmology". Nature Astronomy. 9 (5): 692–701. doi:10.1038/s41550-025-02480-3.

Infinite universe

Latest comment: 4 months ago2 comments2 people in discussion

Does the model assume a flat geometry and infinite spatial universe? No mention in the article. In a physics forum I found "The full details of the model are always being refined, but the part about the universe being spatially infinite is pretty solid, referring to this article but it's not there. Bachcell (talk) 02:24, 5 April 2026 (UTC)Reply

Well, that is why we don't consider "a physics forum" to be a WP:reliable source. An infinite spatial universe is irrelevant to this model as far as I know. If you have a source on this that would make a difference. Johnjbarton (talk) 03:04, 5 April 2026 (UTC)Reply

Define Omega_M before usage

Latest comment: 22 days ago1 comment1 person in discussion

I have noticed that Ω_M is not defined before its usage in an equation, or right afterwards. While Ω_x is described with different values for x, this doesn't include 'm' (for the total matter density). ~2026-41019-65 (talk) 09:45, 22 July 2026 (UTC)Reply

Lambda-CDM model definition

Latest comment: 9 days ago2 comments2 people in discussion

Is it correct to define Lambda-CDM model as a mathematical model primarily? Should we call it cosmological model in general? — Preceding unsigned comment added by Andrejsmirnov97 (talk • contribs) 11:41, 4 August 2026 (UTC)Reply

I agree that mathematical model is redundant for this article. I made changes. Johnjbarton (talk) 15:21, 4 August 2026 (UTC)Reply

[1] Timmer, John (23 July 2014). "Mysterious orbits of dwarf galaxies found all over the nearby Universe". Ars Technica.

[2] Bernal, Tula; Matos, Tonatiuh; San.-Hernandez, Leonardo (1 January 2025). "A natural explanation of the VPOS from multistate Scalar Field Dark Matter". Journal of Cosmology and Astroparticle Physics. 2025 (01): 155. doi:10.1088/1475-7516/2025/01/155.

[3] Kanehisa, Kosuke Jamie; Pawlowski, Marcel S.; Libeskind, Noam (11 April 2025). "Andromeda's asymmetric satellite system as a challenge to cold dark matter cosmology". Nature Astronomy. 9 (5): 692–701. doi:10.1038/s41550-025-02480-3.

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