期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 512, 期 2, 页码 1885-1905出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac649
关键词
galaxy: formation; cosmology: observations; cosmology: theory; dark energy; large-scale structure of Universe
资金
- Isaac Newton Trust
- Kavli Foundation
- Foundation Blanceflor Boncompagni Ludovisi, nee Bildt
- Research Council of Norway
- UNINETT Sigma2 - the National Infrastructure for High Performance Computing and Data Storage in Norway
- ASI [I/023/12/0]
- ASI-INAF [2018-23-HH.0]
- PRIN MIUR 2015 'Cosmology and Fundamental Physics: illuminating the Dark Universe with Euclid'
- PRIN MIUR 2017 'Combining Cosmic Microwave Background and Large Scale Structure data: an Integrated Approach for Addressing Fundamental Questions in Cosmology' [2017YJYZAH]
In this study, we investigate the non-linear effects of scattering between dark energy and baryons on the formation of cosmic structures. Using large N-body simulations, we find that the signatures of this scattering in the non-linear regime are significantly larger than in the linear regime, and could potentially be constrained through a combination of observables.
We consider the recently proposed possibility that dark energy (DE) and baryons may scatter through a pure momentum exchange process, leaving the background evolution unaffected. Earlier work has shown that, even for barn-scale cross-sections, the imprints of this scattering process on linear cosmological observables is too tiny to be observed. We therefore turn our attention to non-linear scales, and for the first time investigate the signatures of DE-baryon scattering on the non-linear formation of cosmic structures, by running a suite of large N-body simulations. The observables we extract include the non-linear matter power spectrum, halo mass function, and density and baryon fraction profiles of haloes. We find that in the non-linear regime the signatures of DE-baryon scattering are significantly larger than their linear counterparts, due to the important role of angular momentum in collapsing structures, and potentially observable. The most promising observables in this sense are the baryon density and baryon fraction profiles of haloes, which can potentially be constrained by a combination of kinetic Sunyaev-Zeldovich (SZ), thermal SZ, and weak lensing measurements. Overall, our results indicate that future prospects for cosmological and astrophysical direct detection of non-gravitational signatures of dark energy are extremely bright.
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