Hydrodynamical N-body simulations of coupled dark energy cosmologies

By Marco Baldi, Valeria Pettorino, G. Robbers, Volker Springel. 2008

200 citations recorded by the source corpus.

If the accelerated expansion of the Universe at the present epoch is driven by a dark energy scalar field, there may well be a non-trivial coupling between the dark energy and the cold dark matter (CDM) fluid. Such interactions give rise to new features in cosmological structure growth, like an additional long-range attractive force between CDM particles, or variations of the dark matter particle mass with time. We have implemented these effects in the N-body code GADGET-2 and present results of a series of high-resolution N-body simulations where the dark energy component is directly interacting with the CDM. As a consequence of the new physics, CDM and baryon distributions evolve differently both in the linear and in the non-linear regime of structure formation. Already on large scales, a linear bias develops between these two components, which is further enhanced by the non-linear evolution. We also find, in contrast with previous work, that the density profiles of CDM haloes are less concentrated in coupled dark energy cosmologies compared with ACDM, and that this feature does not depend on the initial conditions setup, but is a specific consequence of the extra physics induced by the coupling. Also, the baryon fraction in haloes in the coupled models is significantly reduced below the universal baryon fraction. These features alleviate tensions between observations and the ACDM model on small scales. Our methodology is ideally suited to explore the predictions of coupled dark energy models in the fully non-linear regime, which can provide powerful constraints for the viable parameter space of such scenarios.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/71cef668883a68ae1cea2cdde08738813c2fd94d

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Citations in the corpus

Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces (2016, methodology): “These models were first simulated by Baldi et al. (2010) and we use publicly available data from the CODECS simulation project5 (Baldi 2012b) for scalar field DE models with a CDM–DE coupling, so that energy can flow between these two components of the cosmos.”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, methodology): “Furthermore, structure formation itself is modified (Macciò et al. 2004; Manera and Mota 2006; Koivisto 2005; Mainini and Bonometto 2006; Sutter and Ricker 2008; Abdalla et al. 2009; Mota 2008; Bertolami et al. 2009; Wintergerst and Pettorino 2010; Baldi et al. 2010; Baldi 2011b, a; Baldi and Pettor”
Hybrid Metric-Palatini Gravity (2015, background): “On the other hand the mass distribution inside the clusters is fully determined by the initial conditions of the mass distribution that originate in the early universe [101–103], thus allowing the use of galaxy cluster properties to also test cosmological models.”
Interacting dark energy in the early 2020s: A promising solution to the H0 and cosmic shear tensions (2019, background): “[130–239], for a recent comprehensive review see [200]).”