Boltzmann hierarchies for self-interacting warm dark matter scenarios

被引：12

作者：

Yunis, Rafael ^{[1
,2
]}

Arguelles, Carlos R. ^{[3
]}

Nacir, Diana Lopez ^{[4
,5
]}

机构：

[1] ICRANet, Piazza Repubbl 10, I-65122 Pescara, Italy

[2] Univ Roma La Sapienza, Phys Dept, Ple Aldo Moro 5, I-00185 Rome, Italy

[3] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, B1900FWA, La Plata, Argentina

[4] FCEyN UBA, Dept Fis Juan Jose Giambiagi, Ciudad Univ,Pabellon 1, RA-1428 Buenos Aires, DF, Argentina

[5] IFIBA CONICET UBA, Fac Ciencias Exactas & Nat, Ciudad Univ,Pabellon 1, RA-1428 Buenos Aires, DF, Argentina

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2020年 / 09期

关键词：

cosmological perturbation theory; dark matter theory; particle physics - cosmology connection; cosmological neutrinos; LAMBDA-CDM; REST MASS; NEUTRINO; GALAXIES; PHYSICS; HALOES; SIMULATIONS; CONSTRAINTS; CANDIDATES; LIGHT;

D O I：

10.1088/1475-7516/2020/09/041

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 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 tool to evaluate DM self-interaction effects in the linear power spectrum, with the consequent imprints on non-linear scales of structure formation.

引用

页数：48

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