Self-Interacting Fermionic Dark Matter with a Scalar Mediator

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Creator: 

Scott, William

Date: 

2017

Abstract: 

Recent observations of galaxy cluster Abell 3827 reveal a spatial offset between the galaxies and their associated dark matter haloes. It has been suggested that dark matter self-interactions of strength 1.0cm^2 /g<~σ/m<~1.5cm^2 /g could be responsible for the observed discrepancies. We propose a simple model for the dark sector consisting of a Dirac fermion and a scalar mediator. This dark sector is allowed to communicate with the Standard Model through mixing of the scalar mediator with the Higgs. Examination of the dark matter’s thermal freeze-out from p-wave annihilation, in combination with a theoretical upper bound placed on the mediator-fermion coupling strength, indicates that in order to satisfy the observations of Abell 3827, the mediator must be extremely light—between 0.69MeV and 100MeV—whereas the dark matter fermion could have a mass from 0.35GeV to 8200GeV. Analysis of the Higgs-mediator mixing reveals an allowed range of mediator lifetimes, from 3.2×10^(-10)s to 10^(-2)s.

Subject: 

Physics - Theory
Elementary Particles and High Energy

Language: 

English

Publisher: 

Carleton University

Thesis Degree Name: 

Master of Science: 
M.Sc.

Thesis Degree Level: 

Master's

Thesis Degree Discipline: 

Physics

Parent Collection: 

Theses and Dissertations

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