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Effect of polarisation and change of event generator on dark matter annihilation fluxes
Stockholm University, Faculty of Science, Department of Physics.
University of Cincinnati, USA.
Stockholm University, Faculty of Science, Department of Physics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

If indirect detection searches are to be used to discriminate between dark matter particle models, it is crucial to understand the expected energy spectra of secondary particles such as neutrinos, charged antiparticles and gamma rays emerging from dark matter annihilations in the local Universe. We simulate the dark matter annihilation processes and collect the fluxes of the stable end products in the annihilation. In order to get an estimate of the impact of different modelling of the physics in the annihilation process, we compare fluxes obtained with two popular event generators, Pythia8 and Herwig7. We also consider the possible impact of polarisation of the final state in the annihilation, with a specific focuson the impact on neutrino fluxes from dark matter annihilations in the centre of the Sun. We find that differences between the event generators are larger for yields of hadronic end products such as antiprotons, than for leptonic end products. Concerning polarisation, we conversely find the largest differences in the leptonic spectra. We find that for neutrino fluxes from dark matter annihilations in the Sun, differences between the polarisations of the final state are to some extent washed out by neutrino oscillations and interactions in the Sun.

National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:su:diva-169714OAI: oai:DiVA.org:su-169714DiVA, id: diva2:1325821
Available from: 2019-06-17 Created: 2019-06-17 Last updated: 2019-06-17Bibliographically approved
In thesis
1. Studies of dark matter annihilation and production in the Universe
Open this publication in new window or tab >>Studies of dark matter annihilation and production in the Universe
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this PhD thesis we investigate various aspects of particle dark matter. The proper identification of dark matter developed during the second half of the twentieth century to become one of the biggest endeavours in modern physics and astronomy. Although observations currently favour the explanation that dark matter consists of a new form of particle, no experimental search has yet provided unequivocal evidence of such a particle. 

Of particular importance in this thesis is the field of indirect detection of dark matter, where one searches for the particles emerging from annihilations of dark matter particles out in the Universe. Specifically, we consider dark matter annihilations in the centre of the Sun. As the Sun moves through the galaxy, some dark matter particles scatter in the Sun and lose enough energy to become bound to the Sun. They settle in the solar core and begin to annihilate, which leads to an annihilation signal from the solar direction.

The thesis is built on novel research consisting of three papers and a monograph-type chapter. In the first paper we calculate the flux of high energy neutrinos coming from cosmic ray cascades in the solar atmosphere and investigate the role it plays as a background in solar dark matter searches. In the second paper we consider dark matter annihilating into long-lived mediators in the Sun, which leads to interesting new detection possibilities. A third paper explores more generally the fluxes of secondary particles from dark matter annihilations that are searched for in indirect detection. We look at the effects of changing the Monte Carlo event generator that generates the fluxes and of having polarized final states in the annihilations. Finally, we consider in a monograph-type chapter the production of dark matter in the early Universe through the freeze-out mechanism, looking at effects of higher order corrections in the calculation of the relic abundance in the minimal supersymmetric standard model.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2019. p. 132
Keywords
dark matter, neutrinos, astroparticle physics, indirect detection
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-169786 (URN)978-91-7797-739-1 (ISBN)978-91-7797-740-7 (ISBN)
Public defence
2019-09-06, FB53, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 3: Manuscript.

Available from: 2019-08-14 Created: 2019-06-17 Last updated: 2019-08-07Bibliographically approved

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