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Pinning down inelastic dark matter in the Sun and in direct detection
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.
KTH, School of Engineering Sciences (SCI), Theoretical Physics.
2016 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, E-ISSN 1475-7516, Vol. 2016, no 4, 004Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

We study the solar capture rate of inelastic dark matter with endothermic and/or exothermic interactions. By assuming that an inelastic dark matter signal will be observed in next generation direct detection experiments we can set a lower bound on the capture rate that is independent of the local dark matter density, the velocity distribution, the galactic escape velocity as well as the scattering cross section. In combination with upper limits from neutrino observatories we can place upper bounds on the annihilation channels leading to neutrinos. We find that, while endothermic scattering limits are weak in the isospin-conserving case, strong bounds may be set for exothermic interactions, in particular in the spin-dependent case. Furthermore, we study the implications of observing two direct detection signals, in which case one can halo-independently obtain the dark matter mass and the mass splitting, and disentangle the endothermic/exothermic nature of the scattering. Finally we discuss isospin violation.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2016. Vol. 2016, no 4, 004
Keyword [en]
dark matter experiments, dark matter theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-187090DOI: 10.1088/1475-7516/2016/04/004ISI: 000393286400012Scopus ID: 2-s2.0-84963705514OAI: oai:DiVA.org:kth-187090DiVA: diva2:928942
Note

QC 20160517

Available from: 2016-05-17 Created: 2016-05-17 Last updated: 2017-03-08Bibliographically 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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