Doctoral thesis (Dissertations and theses)
Multi-component dark matter models with new interactions
Laletin, Maxim
2019
 

Files


Full Text
Thesis_Laletin_fin.pdf
Author preprint (5.66 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
dark matter; cosmology; cosmic rays; direct detection; indirect detection; early Universe
Abstract :
[en] This work is devoted to the study of three different models of dark matter, which include non-standard interactions with ordinary matter or with itself, and their effects in cosmology and astrophysics. Multi-component dark matter models include more than one sort of new fundamental particles and their interactions and typically have richer phenomenology. The introduction of such additional candidates allows to explain various observational discrepancies in astrophysics or cosmology and/or offers new possibilities to probe the nature of dark matter. The excess of high-energy cosmic positrons above the astrophysical prediction can have a dark matter origin. We show that, however, dark matter explanations of this phenomenon, which assume a conventional density distribution in the Galaxy, are in serious tension with the observations of the isotropic gamma-ray background. As a possible alternative explanation, we investigate the model of self-interacting dark matter, which forms a disk and alleviates the problem with gamma-ray mea- surements. Some models of strongly interacting massive particles (SIMPs) might produce the signal in the DAMA detector and explain the contradiction with the results of other direct detection experiments. We study the propagation of SIMPs in the ground and demonstrate that such models cannot reproduce the time-dependent features of the observed rate of events. The 3-Higgs-Doublet Model (3HDM) with the CP symmetry of order 4 is the simplest extension of the Higgs sector that allows to stabilize potential dark matter candidates without any additional symmetries. This model contains a new inter- action that converts one dark matter candidate into another and leads to novel phenomenology of asymmetric dark matter. We describe the cosmological ther- mal evolution of dark matter density in this model and discuss the perspectives of indirect detection.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Laletin, Maxim ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Inter. fondamentales en physique et astrophysique (IFPA)
Language :
English
Title :
Multi-component dark matter models with new interactions
Defense date :
29 August 2019
Institution :
ULiège - Université de Liège
Degree :
Doctor of Science
Promotor :
Cudell, Jean-René  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
President :
Nazé, Yaël  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Secretary :
Sluse, Dominique  ;  Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Jury member :
Ivanov, Igor ;  Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique (IFPA)
Belotsky, Konstantin
Lopez Honorez, Laura
Lopez-Coto, Ruben
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 31 July 2019

Statistics


Number of views
141 (25 by ULiège)
Number of downloads
11 (10 by ULiège)

Bibliography


Similar publications



Contact ORBi