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Neutralino Dark Matter in BMSSM Effective Theory
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
University of Utah.
Stockholm University, Faculty of Science, Department of Physics. (CoPS)
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2009 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 08Article in journal (Refereed) Published
Abstract [en]

We study thermal neutralino dark matter in an effective field theory extension of the MSSM, called ``Beyond the MSSM'' (BMSSM) in Dine, Seiberg and Thomas (2007). In this class of effective field theories, the field content of the MSSM is unchanged, but the little hierarchy problem is alleviated by allowing small corrections to the Higgs/higgsino part of the Lagrangian. We perform parameter scans and compute the dark matter relic density. The light higgsino LSP scenario is modified the most; we find new regions of parameter space compared to the standard MSSM. This involves interesting interplay between the WMAP dark matter bounds and the LEP chargino bound. We also find some changes for gaugino LSPs, partly due to annihilation through a Higgs resonance, and partly due to coannihilation with light top squarks in models that are ruled in by the new effective terms.

Place, publisher, year, edition, pages
IOP Publishing , 2009. no 08
Keyword [en]
supersymmetry and cosmology, dark matter theory
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-33940DOI: 10.1088/1475-7516/2009/08/035ISI: 000270036800035OAI: oai:DiVA.org:su-33940DiVA: diva2:283848
Available from: 2009-12-30 Created: 2009-12-30 Last updated: 2012-03-30Bibliographically approved
In thesis
1. Phenomenology of Inert Scalar and Supersymmetric Dark Matter
Open this publication in new window or tab >>Phenomenology of Inert Scalar and Supersymmetric Dark Matter
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

While the dark matter has so far only revealed itself through the gravitational influence it exerts on its surroundings, there are good reasons to believe it is made up by WIMPs – a hypothetical class of heavy elementary particles not encompassed by the Standard Model of particle physics.

The Inert Doublet Model constitutes a simple extension of the Standard Model Higgs sector. The model provides a new set of scalar particles, denoted inert scalars because of their lack of direct coupling to matter, of which the lightest is a WIMP dark matter candidate.

Another popular Standard Model extension is that of supersymmetry. In the most minimal scenario the particle content is roughly doubled, and the lightest of the new supersymmetric particles, which typically is a neutralino, is a WIMP dark matter candidate.

In this thesis the phenomenology of inert scalar and supersymmetric dark matter is studied. Relic density calculations are performed, and experimental signatures in indirect detection experiments and accelerator searches are derived.

The Inert Doublet Model shows promising prospects for indirect detection of dark matter annihilations into monochromatic photons. It is also constrained by the old LEP II accelerator data.

Some phenomenological differences between the Minimal Supersymmetric Standard Model and a slight extension, the Beyond the Minimal Supersymmetric Standard Model, can be found. Also, supersymmetric dark matter models can be detected already within the early LHC accelerator data.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 85 p.
Keyword
Dark matter, inert scalars, supersymmetry, indirect detection, accelerator searches
National Category
Physical Sciences Subatomic Physics Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-39278 (URN)978-91-7447-097-0 (ISBN)
Public defence
2010-06-10, FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2010-05-19 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved
2. Cosmoparticle Physics and String Theory
Open this publication in new window or tab >>Cosmoparticle Physics and String Theory
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with phenomenological and theoretical aspects of cosmoparticle physics and string theory. There are many open questions in these topics. In connection with cosmology we would like to understand the detailed properties of dark matter, dark energy, generation of primordial perturbations, etc., and in connection with particle physics we would like to understand the detailed properties of models that stabilize the electroweak scale, for instance supersymmetry. At the same time, we also need to understand these issues in a coherent theoretical framework. Such a framework is offered by string theory.

In this thesis, I analyze the interplay between Higgs and dark matter physics in an effective field theory extension of the minimally supersymmetric standard model. I study a theory of modified gravity, where the graviton has acquired a mass, and show the explicit implementation of the Vainshtein mechanism, which allows one to put severe constraints on the graviton mass. I address the question of Planck scale corrections to inflation in string theory, and show how such corrections can be tamed. I study perturbations of warped throat regions of IIB string theory compactifications and classify allowed boundary conditions. Using this analysis, I determine the potential felt by an anti-D3-brane in such compactifications, using the explicit harmonic data on the conifold. I also address questions of perturbative quantum corrections in string theory and calculate one-loop corrections to the moduli space metric of Calabi-Yau orientifolds.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2012. 107 p.
Keyword
Supersymmetry, dark matter, cosmology, inflation, modifications of gravity, string theory, flux compactifications, perturbative string theory
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-74928 (URN)978-91-7447-492-3 (ISBN)
Public defence
2012-05-02, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows:  Paper 3: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.

Available from: 2012-04-10 Created: 2012-03-29 Last updated: 2012-03-30Bibliographically approved

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