A cosmic degeneracy story: structure formation with warm dark matter and scale-dependent primordial non-Gaussianities

Dokumentdetails

ID

oai:arXiv.org:2501.03672

Thema

Astrophysics - Cosmology and Nonga...

Autor

Stahl, Clément Famaey, Benoit Ibata, Rodrigo Kraljic, Katarina Castillo, Fabien

Kategorie

Wissenschaften: Astrophysik

Jahr

2025

Auflistungsdatum

15.01.2025

Schlüsselwörter

models dark spng wdm

Metrisch

Zusammenfassung

It has been recently shown that cosmological models with scale-dependent primordial non-Gaussianities (sPNG) could provide a possible path to solve current cosmic tensions.

Moreover, it has been pointed out that some of these models might mimic the effects of Warm Dark Matter (WDM) for several observables at low redshift.

Here, we confirm the qualitative similarity of the matter power spectrum for sPNG and WDM models, but also point out differences in the halo mass function and void size function.

We then jointly simulate WDM and sPNG together.

Such simulations allow us to demonstrate that the joint impact of WDM and sPNG is close to the linear superposition of their respective effects at low redshift, at the percent level.

We finally propose a model with mixed hot and cold dark matter together with sPNG, that reproduces the $\Lambda$CDM power spectrum at redshifts $z \leq 3$ but is still distinct in terms of halo statistics.

;Comment: 13 pages, 7 figures, comments welcome :)

Stahl, Clément,Famaey, Benoit,Ibata, Rodrigo,Kraljic, Katarina,Castillo, Fabien, 2025, A cosmic degeneracy story: structure formation with warm dark matter and scale-dependent primordial non-Gaussianities