Exploring extensions to the standard cosmological model and the impact of baryons on small scales
| العنوان: | Exploring extensions to the standard cosmological model and the impact of baryons on small scales |
|---|---|
| المؤلفون: | Andrew Robertson, Sam G. Stafford, Robert Poole-McKenzie, Shaun T. Brown, Andreea S. Font, Ian G. McCarthy |
| المصدر: | Monthly Notices of the Royal Astronomical Society Monthly notices of the Royal Astronomical Society, 2020, Vol.497(3), pp.3809-3829 [Peer Reviewed Journal] |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Physics, Inflation (cosmology), Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Halo mass function, Dark matter, Scalar (physics), FOS: Physical sciences, Astronomy and Astrophysics, Lambda-CDM model, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Cosmology, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Galaxy formation and evolution, Warm dark matter, Statistical physics, 010303 astronomy & astrophysics, QC, QB, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | It has been claimed that the standard model of cosmology (LCDM) cannot easily account for a number of observations on relatively small scales, motivating extensions to the standard model. Here we introduce a new suite of cosmological simulations that systematically explores three plausible extensions: warm dark matter, self-interacting dark matter, and a running of the scalar spectral index of density fluctuations. Current observational constraints are used to specify the additional parameters that come with these extensions. We examine a large range of observable metrics on small scales, including the halo mass function, density and circular velocity profiles, the abundance of satellite subhaloes, and halo concentrations. For any given metric, significant degeneracies can be present between the extensions. In detail, however, the different extensions have quantitatively distinct mass and radial dependencies, suggesting that a multi-probe approach over a range of scales can be used to break the degeneracies. We also demonstrate that the relative effects on the radial density profiles in the different extensions (compared to the standard model) are converged down to significantly smaller radii than are the absolute profiles. We compare the derived cosmological trends with the impact of baryonic physics using the EAGLE and ARTEMIS simulations. Significant degeneracies are also present between baryonic physics and cosmological variations (with both having similar magnitude effects on some observables). Given the inherent uncertainties both in the modelling of galaxy formation physics and extensions to LCDM, a systematic and simultaneous exploration of both is strongly warranted. 22 pages, 12 figures, to match MNRAS accepted version |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12d8c7e4520bdcd52c615b9d4f733362 http://arxiv.org/abs/2004.03872 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....12d8c7e4520bdcd52c615b9d4f733362 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00358711 |
|---|