Boltzmann hierarchies for self-interacting warm dark matter scenarios

We provide a general framework for self-interacting warm dark matter (WDM) in cosmological perturbations, by deriving from first principles a Boltzmann hierarchy which retains certain independence from a particular interaction Lagrangian. We consider elastic interactions among the massive particles,...

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Detalles Bibliográficos
Autores principales: Yunis, Rafael, Argüelles, Carlos Raúl, López Nacir, Diana
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2020
Materias:
Astronomía
Ciencias Exactas
warm dark matter
cosmological perturbations
Boltzmann collision
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/140942
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-140942
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
Ciencias Exactas
warm dark matter
cosmological perturbations
Boltzmann collision
spellingShingle Astronomía
Ciencias Exactas
warm dark matter
cosmological perturbations
Boltzmann collision
Yunis, Rafael
Argüelles, Carlos Raúl
López Nacir, Diana
Boltzmann hierarchies for self-interacting warm dark matter scenarios
topic_facet Astronomía
Ciencias Exactas
warm dark matter
cosmological perturbations
Boltzmann collision
description We provide a general framework for self-interacting warm dark matter (WDM) in cosmological perturbations, by deriving from first principles a Boltzmann hierarchy which retains certain independence from a particular interaction Lagrangian. We consider elastic interactions among the massive particles, and obtain a hierarchy which is more general than the ones usually obtained for non-relativistic (as for cold DM) or for ultra-relativistic (as for neutrinos) approximations. The more general momentum-dependent kernel integrals in the Boltzmann collision terms, are explicitly calculated for different field-mediator models, including examples of a scalar field (either massive or massless) or a massive vector field. As an application, we study the evolution of the interaction rate per particle under the relaxation time approximation, and assess when a given self-interaction is relevant in comparison with the Hubble expansion rate. Our framework aims to be a useful starting point to evaluate DM self-interaction effects in the linear power spectrum, necessary to then study its evolution all the way to non-linear stages of structure formation, where certain DM interactions were proven to be relevant.
format Articulo
Preprint
author Yunis, Rafael
Argüelles, Carlos Raúl
López Nacir, Diana
author_facet Yunis, Rafael
Argüelles, Carlos Raúl
López Nacir, Diana
author_sort Yunis, Rafael
title Boltzmann hierarchies for self-interacting warm dark matter scenarios
title_short Boltzmann hierarchies for self-interacting warm dark matter scenarios
title_full Boltzmann hierarchies for self-interacting warm dark matter scenarios
title_fullStr Boltzmann hierarchies for self-interacting warm dark matter scenarios
title_full_unstemmed Boltzmann hierarchies for self-interacting warm dark matter scenarios
title_sort boltzmann hierarchies for self-interacting warm dark matter scenarios
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/140942
work_keys_str_mv AT yunisrafael boltzmannhierarchiesforselfinteractingwarmdarkmatterscenarios
AT arguellescarlosraul boltzmannhierarchiesforselfinteractingwarmdarkmatterscenarios
AT lopeznacirdiana boltzmannhierarchiesforselfinteractingwarmdarkmatterscenarios
bdutipo_str Repositorios
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