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Cosmological aspects of universal extra dimensions
Stockholm University, Faculty of Science, Department of Physics.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

It is an intriguing possibility that our world may consist of more than three spatial dimensions, compactified on such a small scale that they so far have escaped detection. In this thesis, a particular realization of this idea -- the scenario of so-called 'universal extra dimensions' (UED) -- is studied in some detail, with a focus on cosmological consequences and appplications.

The first part investigates whether the size of homogeneous extra dimensions can be stabilized on cosmological time scales. This is necessary in order not to violate the stringent observational bounds on a possible variation of the fundamental constants of nature.

An important aspect of the UED model is that it can provide a natural explanation for the mysterious dark matter, which contributes nearly thirty times as much as luminous matter like stars, galaxies etc. to the total energy content of the universe. In the second part of this thesis, the observational prospects for such a dark matter candidate are examined. In particular, it is shown how dark matter annihilations taking place in the Milky Way could give rise to exotic contributions to the cosmic ray spectrum in photons and antiprotons, leading to distinct experimental signatures to look for.

This includes a comparison with similar effects from other dark matter candidates, most notably the neutralino, which appears in supersymmetric extensions of the standard model of particle physics.

Place, publisher, year, edition, pages
Stockholm: Fysikum , 2005. , 111 p.
Keyword [en]
Cosmology, dark matter, extra dimensions
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-618ISBN: 91-7155-117-4 (print)OAI: oai:DiVA.org:su-618DiVA: diva2:196148
Public defence
2005-09-16, sal FB53, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Available from: 2005-08-23 Created: 2005-08-23Bibliographically approved
List of papers
1. Cosmological evolution of universal extra dimensions
Open this publication in new window or tab >>Cosmological evolution of universal extra dimensions
2003 In: Physical Review D, Vol. 68, no 063516, 12- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23967 (URN)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23Bibliographically approved
2. Can homogeneous extra dimensions be stabilized during matter domination?
Open this publication in new window or tab >>Can homogeneous extra dimensions be stabilized during matter domination?
2003 In: Journal of Cosmology and Astroparticle Physics, Vol. 0310, no 006, 9- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23968 (URN)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23Bibliographically approved
3. Gamma Rays from Kaluza-Klein Dark Matter
Open this publication in new window or tab >>Gamma Rays from Kaluza-Klein Dark Matter
2005 In: Phys.Rev.Lett., Vol. 94, no 131301, 4- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23969 (URN)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23Bibliographically approved
4. Two photon annihilation of Kaluza-Klein dark matter
Open this publication in new window or tab >>Two photon annihilation of Kaluza-Klein dark matter
2005 In: Journal of Cosmology and Astroparticle Physics, Vol. 0504, no 004, 17- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-23970 (URN)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23Bibliographically approved
5. High-energetic Cosmic Antiprotons from Kaluza-Klein Dark Matter
Open this publication in new window or tab >>High-energetic Cosmic Antiprotons from Kaluza-Klein Dark Matter
2005 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 2005, no 08Article in journal (Refereed) Published
Abstract [en]

The lightest Kaluza–Klein particle (LKP) in models with universal extra dimensions is an interesting dark matter candidate that has recently received great attention. Here, we investigate the antiproton flux from LKP annihilations in the galactic halo. In our analysis we include different halo density profiles and allow for part of the dark matter to be concentrated in 'clumps' rather than being distributed homogeneously. After re-analysing the observational bounds on the allowed amount of clumpiness, we find that LKP annihilations may well give a significant contribution to the antiproton flux at energies higher than about 10 GeV, while for energies above around 500 GeV the conventional background is expected to dominate again. The shortly upcoming PAMELA satellite will already be able to measure part of this high-energy window, while planned experiments like AMS-02 will have access to the full energy range of interest.

Keyword
cosmology with extra dimensions cosmic rays dark matter
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:su:diva-23971 (URN)10.1088/1475-7516/2005/08/006 (DOI)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23 Last updated: 2017-12-13Bibliographically approved
6. Gamma Rays from Heavy Neutralino Dark Matter
Open this publication in new window or tab >>Gamma Rays from Heavy Neutralino Dark Matter
Manuscript (Other academic)
Identifiers
urn:nbn:se:su:diva-23972 (URN)
Note
Part of urn:nbn:se:su:diva-618Available from: 2005-08-23 Created: 2005-08-23 Last updated: 2010-01-13Bibliographically approved

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