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Energy transfer from baryons to dark matter as a unified solution to small-scale structure issues of the Λ CDM model

A. Del Popolo, F. Pace, M. Le Delliou, X. Lee

Abstract

Using a semianalytic code, we show how baryon physics in a ΛCDM cosmology could solve the discrepancy between numerical predictions of dark matter haloes and observations, ranging from dwarf galaxies to clusters, without the need of nonstandard dark matter models as advocated, for example, by [Kaplinghat et al., Phys. Rev. Lett. 116, 041302, (2016)]. Combining well established results, we show, for the first time, how accounting for baryon physics, in particular dynamical friction mechanisms, leads to flat galaxy-cluster profiles and correlations in several of their properties, solves the so-called “diversity problem” and reproduces very well the challenging, extremely low-rising rotation curve of IC2574. We, therefore, suggest treating baryonic physics properly before introducing new exotic features, albeit legitimate, in the standard cosmological model.

Keywords
DWARF SPHEROIDAL GALAXIES; CUSP-CORE TRANSFORMATIONS; GALACTIC NUCLEUS FEEDBACK; SPHERICAL COLLAPSE MODEL; HIGH-REDSHIFT GALAXIES; DENSITY PROFILES; COSMOLOGICAL SIMULATIONS; DISK GALAXIES; GIANT CLUMPS; GRAVITATIONAL COLLAPSE

Physical Review D
Volume 98, Issue 6, Page 10
2018 September

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia