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Asymmetric capture of Dirac dark matter by the Sun
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.ORCID iD: 0000-0001-5948-9152
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Particle Physics.
2015 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 2015, no 8, 036Article in journal (Refereed) Published
Abstract [en]

Current problems with the solar model may be alleviated if a significant amount of dark matter from the galactic halo is captured in the Sun. We discuss the capture process in the case where the dark matter is a Dirac fermion and the background halo consists of equal amounts of dark matter and anti-dark matter. By considering the case where dark matter and anti-dark matter have different cross sections on solar nuclei as well as the case where the capture process is considered to be a Poisson process, we find that a significant asymmetry between the captured dark particles and anti-particles is possible even for an annihilation cross section in the range expected for thermal relic dark matter. Since the captured number of particles are competitive with asymmetric dark matter models in a large range of parameter space, one may expect solar physics to be altered by the capture of Dirac dark matter. It is thus possible that solutions to the solar composition problem may be searched for in these type of models.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2015. Vol. 2015, no 8, 036
Keyword [en]
dark matter simulations, dark matter theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-175014DOI: 10.1088/1475-7516/2015/08/036Scopus ID: 2-s2.0-84940868751OAI: oai:DiVA.org:kth-175014DiVA: diva2:875206
Note

QC 20151130

Available from: 2015-11-30 Created: 2015-10-09 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Effects of Dark Matter in Astrophysical Systems
Open this publication in new window or tab >>Effects of Dark Matter in Astrophysical Systems
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

When studying astrophysical structures with sizes ranging from dwarf galaxies to galaxy clusters, it becomes clear that there are vast amounts of unobservable gravitating mass. A compelling hypothesis is that this missing mass, which we call dark matter, consists of elementary particles that can be described in the same manner as those of the standard model of particle physics. This thesis is dedicated to the study of particle dark matter in astrophysical systems.

The solar composition problem refers to the current mismatch between theoretical predictions and observations of the solar convection zone depth and sound speed profile. It has been shown that heat transfer by dark matter in the Sun may cool the solar core and alleviate the problem. We discuss solar capture of a self-interacting Dirac fermion dark matter candidate and show that, even though particles and antiparticles annihilate, the abundance of such a particle may be large enough to influence solar physics.

Currently, direct and indirect methods are employed in searches for dark matter. In this context, we study inelastic dark matter, where a small mass splitting separates two dark matter particles and scattering takes one into the other. This affects the scattering kinematics, which in turn affects direct detection and solar capture rates. We also discuss the information contained in a direct detection signal and how it can be used to infer a minimal solar capture rate of dark matter.

When comparing simulated dark matter halos with collisionless dark matter with dark matter halos inferred from observations, problems appear in the smallest structures. A proposed solution is self-interacting dark matter with long range forces. As the simplest models are under severe constraints, we study self-interactions in a model of inelastic dark matter.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 68 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:13
Keyword
Dark matter, Self-interactions, solar capture, helioseismology, inelastic dark matter, direct detection, indirect detection
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-202956 (URN)978-91-7729-307-1 (ISBN)
Presentation
2017-04-07, FB54, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170309

Available from: 2017-03-09 Created: 2017-03-08 Last updated: 2017-03-09Bibliographically approved

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Blennow, Mattias

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