CP violation in QCD, axions and possible connections to dark matter
(2013) FYSK01 20122Department of Physics
 Abstract
 The strong CP problem and its solution are treated on the undergraduate level. We first review the theoretical background of symmetry and symmetry breaking in particle physics. The Goldstone model is treated for several simple systems: the linear sigma model, the Higgs mechanism and the interpretation of pions as pseudoGoldstone bosons in QCD. The problem of lack of CPviolation in strong interactions is explained, and the most popular solutionthe addition of an additional $U(1)_{\mathrm{PQ}}$symmetric field and its quanta, the axionis presented. The current experimental status of the axion is detailed, including limits set by laboratory and astrophysical searches. Finally, the axion in the context of its possible role as a dark... (More)
 The strong CP problem and its solution are treated on the undergraduate level. We first review the theoretical background of symmetry and symmetry breaking in particle physics. The Goldstone model is treated for several simple systems: the linear sigma model, the Higgs mechanism and the interpretation of pions as pseudoGoldstone bosons in QCD. The problem of lack of CPviolation in strong interactions is explained, and the most popular solutionthe addition of an additional $U(1)_{\mathrm{PQ}}$symmetric field and its quanta, the axionis presented. The current experimental status of the axion is detailed, including limits set by laboratory and astrophysical searches. Finally, the axion in the context of its possible role as a dark matter (DM) candidate is reviewed, focusing primarily on the theory of axionic cold dark matter and its status. We find that the axion is an appealing solution to the CP problem, and a highly viable candidate for cold dark matter in the Universe. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/studentpapers/record/4281318
 author
 Corrigan, Eric ^{LU}
 supervisor

 Torsten Ã…kesson ^{LU}
 organization
 course
 FYSK01 20122
 year
 2013
 type
 M2  Bachelor Degree
 subject
 keywords
 QCD, axions, CP violation, dark matter, symmetry breaking
 language
 English
 id
 4281318
 date added to LUP
 20140326 13:11:31
 date last changed
 20140326 13:11:31
@misc{4281318, abstract = {{The strong CP problem and its solution are treated on the undergraduate level. We first review the theoretical background of symmetry and symmetry breaking in particle physics. The Goldstone model is treated for several simple systems: the linear sigma model, the Higgs mechanism and the interpretation of pions as pseudoGoldstone bosons in QCD. The problem of lack of CPviolation in strong interactions is explained, and the most popular solutionthe addition of an additional $U(1)_{\mathrm{PQ}}$symmetric field and its quanta, the axionis presented. The current experimental status of the axion is detailed, including limits set by laboratory and astrophysical searches. Finally, the axion in the context of its possible role as a dark matter (DM) candidate is reviewed, focusing primarily on the theory of axionic cold dark matter and its status. We find that the axion is an appealing solution to the CP problem, and a highly viable candidate for cold dark matter in the Universe.}}, author = {{Corrigan, Eric}}, language = {{eng}}, note = {{Student Paper}}, title = {{CP violation in QCD, axions and possible connections to dark matter}}, year = {{2013}}, }