Distinguish dark matter theories with the cosmic web and next-generation surveys I: an alternative theory of gravity
arxiv(2024)
摘要
In the context of future large surveys like the Euclid mission, extracting
the cosmic web from galaxies at higher redshifts with more statistical power
will become feasible, particularly within the group-cluster mass regime.
Therefore, it is imperative to enlarge the number of metrics that can used to
constrain our cosmological models at these large scales. The number of cosmic
filaments surrounding galaxies, groups and clusters, namely the connectivity,
has recently emerged as a compelling probe of the large-scale structures, and
has been investigated in various observational and numerical analyses. In this
first paper, we examine dark matter-only cosmological simulations using the
widely used DisPerSE filament finder code under two theories of gravity: the
Poisson (ΛCDM) and the Monge-Ampère models, in order to quantify how
alternative models of gravity alter the properties of the cosmic skeleton. We
specifically focused on this alternative gravity theory due to its propensity
to enhance the formation of anisotropic structures such as filaments, but it
also makes them more resistant to collapse, which consequently reduces the
formation of halos. Indeed, our findings reveal that replacing the Poisson
equation has a significant impact on the hierarchical formation scenario. This
is evidenced by examining the redshift evolution of both the slope and the
offset of the connectivity. Additionally, we demonstrated that current
observations are generally in better agreement with our well-established
gravity model. Finally, our study suggests that filament connectivity in the
group-cluster regime could serve as a probe of our gravity model at
cosmological scales. We also emphasize that our approach could be extended to
alternative theories of dark matter, such as warm or fuzzy dark matter, given
the extraordinary datasets provided by next-generation surveys.
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