ETHOS - an effective theory of structure formation: Dark matter physics as a possible explanation of the small-scale CDM problems

Mark Vogelsberger, Jesús Zavala, Francis Yan Cyr-Racine, Christoph Pfrommer, Torsten Bringmann, Kris Sigurdson

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

132 Tilvitnanir (Scopus)

Útdráttur

We present the first simulations within an effective theory of structure formation (ETHOS), which includes the effect of interactions between dark matter and dark radiation on the linear initial power spectrum and dark matter self-interactions during non-linear structure formation. We simulate a Milky Way-like halo in four different dark matter models and the cold dark matter case. Our highest resolution simulation has a particle mass of 2.8 × 104 M and a softening length of 72.4 pc. We demonstrate that all alternative models have only a negligible impact on large-scale structure formation. On galacticscales, however, the models significantly affect the structure and abundance of subhaloes due to the combined effects of small-scale primordial damping in the power spectrum and late-time self-interactions. We derive an analytic mapping from the primordial damping scale in the power spectrum to the cutoff scale in the halo mass function and the kinetic decoupling temperature. We demonstrate that certain models within this extended effective framework that can alleviate the too-big-to-fail and missing satellite problems simultaneously, and possibly the core-cusp problem. The primordial power spectrum cutoff of our models naturally creates a diversity in the circular velocity profiles, which is larger than that found for cold dark matter simulations. We show that the parameter space of models can be constrained by contrasting model predictions to astrophysical observations. For example, some models may be challenged by the missing satellite problem if baryonic processes were to be included and even oversolve the too-big-to-fail problem; thus ruling them out.

Upprunalegt tungumálEnska
Síður (frá-til)1399-1416
Síðufjöldi18
FræðitímaritMonthly Notices of the Royal Astronomical Society
Bindi460
Númer tölublaðs2
DOI
ÚtgáfustaðaÚtgefið - 1 ágú. 2016

Athugasemd

Publisher Copyright:
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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