Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Self-interacting inelastic dark matter: A viable solution to the small scale structure problems
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.ORCID iD: 0000-0001-5948-9152
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Theoretical Particle Physics. University of Adelaide, Australia.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Self-interacting dark matter has been proposed as a solution to the small-scale structure problems, such as the observed flat cores in dwarf and low surface brightness galaxies. If scattering takes place through light mediators, the scattering cross section relevant to solve these problems may fall into the non-perturbative regime leading to a non-trivial velocity dependence, which allows compatibility with limits stemming from cluster-size objects. However, these models are strongly constrained by different observations, in particular from the requirements that the decay of the light mediator is sufficiently rapid (before Big Bang Nucleosynthesis) and from direct detection. A natural solution to reconcile both requirements are inelastic endothermic interactions, such that scatterings in direct detection experiments are suppressed or even kinematically forbidden if the mass splitting between the two-states is sufficiently large. Using an exact solution when numerically solving the Schr\"odinger equation, we study such scenarios and find regions in the parameter space of dark matter and mediator masses, and the mass splitting of the states, where the small scale structure problems can be solved, the dark matter has the correct relic abundance and direct detection limits can be evaded.

Keywords [en]
Dark matter theory, self-interactions, small scale structure problems
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kth:diva-202949OAI: oai:DiVA.org:kth-202949DiVA, id: diva2:1079521
Note

QC 20170309

Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-03-09Bibliographically 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. p. 68
Series
TRITA-FYS, ISSN 0280-316X ; 2017:13
Keywords
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

Open Access in DiVA

fulltext(1150 kB)47 downloads
File information
File name FULLTEXT01.pdfFile size 1150 kBChecksum SHA-512
5556311e19edebe28f6c88756c387d2d44427a7d3798304d6a770fee878ad339a89f56d806562b7b57706dfbbe60153fb3f87da0bcc10c5e4bf5f5f6747a4b01
Type fulltextMimetype application/pdf

Other links

arXiv

Search in DiVA

By author/editor
Blennow, MattiasClementz, StefanHerrero-Garcia, Juan
By organisation
Theoretical Particle Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 47 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 66 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf