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Dark Matter: Particle Evolution through Freeze-out
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
2014 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Mörk materia: Partikelutveckling genom utfrysning (Swedish)
Abstract [en]

This report focuses on the evolution of dark matter particles in a simplied, homogeneous

and isotropic model of the Universe. The purpose is to analyze theoretical predictions and

recent experimental measurements to be able to draw conclusions about the properties

of the dark matter particles. The inexperienced reader is introduced to the subject and

thorough derivations of the formulas relevant to the analysis are made. To analyze the

evolution of dark matter, the Boltzmann equation is applied to a freeze-out model. Both

analytical and numerical approaches will be taken and discrepancies between those are

investigated. Qualitative eects of the particle cross section and mass are studied and

constraints on the parameters are set using experimental data. Finally, assumptions are

discussed and suggestions for further research are made.

Abstract [sv]

Rapporten fokuserar på utvecklingen av mörk materia-partiklar i en förenklad, homogen

och isotrop modell av universum. Syftet är att analysera teoretiska förutsägelser och

nyligen genomförda experimentella mätningar för att dra slutsatser om mörk materiapartiklarnas

egenskaper. Den oerfarne läsaren introduceras till ämnet och en utförlig

härledning av de relevanta formlerna genomförs. Boltzmannekvationen tillämpas på en

utfrysningsmodell och används för att analysera utvecklingen av den mörka materian.

Både analytiska och numeriska metoder används och skillnader mellan dessa studeras.

Kvalitativa eekter av partiklarnas tvärsnitt och massa undersöks och begränsningar av

parametrarna görs med hjälp av experimentell data. Slutligen diskuteras antaganden och

förslag för fortsatt forskning läggs fram.

Place, publisher, year, edition, pages
2014. , 27 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-145892OAI: oai:DiVA.org:kth-145892DiVA: diva2:720978
Supervisors
Available from: 2014-06-03 Created: 2014-06-03 Last updated: 2016-06-28Bibliographically approved

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Kandidatexamensarbete Dennis Alp, Samuel Modée(546 kB)305 downloads
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