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**Harvard**

Bergström, S., Högberg, M., Olsson, E. och Unger, A. (2017) *Dwarf Spheroidal J-factors with Self-interacting Dark Matter*.

** BibTeX **

@misc{

Bergström2017,

author={Bergström, Sebastian and Högberg, Michael and Olsson, Emelie and Unger, Andreas},

title={Dwarf Spheroidal J-factors with Self-interacting Dark Matter},

abstract={The next decade of searches in the field of dark matter will focus on the detection of
gamma rays from dark matter annihilation in dwarf spheroidal galaxies. This dark
matter-induced gamma ray flux crucially depends on a quantity known as the Jfactor.
In current research, the J-factor calculations does not include self-interaction
between the dark matter particles, but there are indications on galactic scales that
dark matter is self-interacting. The purpose of this thesis is to introduce a thorough
generalisation of the J-factor to include a self-interacting effect and to compute
the factor for 20 dwarf spheroidal galaxies orbiting the Milky Way. We thoroughly
study the fundamental theory needed to compute the J-factor, based on Newtonian
dynamics and non-relativistic quantum mechanics. A maximum likelihood formalism
is applied to velocity data from dwarf spheroidal galaxies, assuming a Gaussian
distribution for the line of sight velocity data. From this we extract galactic length
and density scale parameters. The acquired parameters are then used to compute
the J-factor. Using a binning approach, we present an error estimate in J. The used
method is compared to previously published results, by neglecting self-interaction.
We perform the first fully rigorous calculation for the J-factor, properly taking into
account the dark matter velocity distribution. We can deduce that a previously
used approximation of the self-interaction overestimates the J-factor by 1.5 orders
of magnitude. Furthermore, we confirm that our method produces three to four
orders of magnitudes larger values compared to J-factors without self-interaction.},

year={2017},

keywords={dark matter, J-factor, self-interacting, WIMP, annihilation},

note={77},

}

** RefWorks **

RT Generic

SR Electronic

ID 256433

A1 Bergström, Sebastian

A1 Högberg, Michael

A1 Olsson, Emelie

A1 Unger, Andreas

T1 Dwarf Spheroidal J-factors with Self-interacting Dark Matter

YR 2017

AB The next decade of searches in the field of dark matter will focus on the detection of
gamma rays from dark matter annihilation in dwarf spheroidal galaxies. This dark
matter-induced gamma ray flux crucially depends on a quantity known as the Jfactor.
In current research, the J-factor calculations does not include self-interaction
between the dark matter particles, but there are indications on galactic scales that
dark matter is self-interacting. The purpose of this thesis is to introduce a thorough
generalisation of the J-factor to include a self-interacting effect and to compute
the factor for 20 dwarf spheroidal galaxies orbiting the Milky Way. We thoroughly
study the fundamental theory needed to compute the J-factor, based on Newtonian
dynamics and non-relativistic quantum mechanics. A maximum likelihood formalism
is applied to velocity data from dwarf spheroidal galaxies, assuming a Gaussian
distribution for the line of sight velocity data. From this we extract galactic length
and density scale parameters. The acquired parameters are then used to compute
the J-factor. Using a binning approach, we present an error estimate in J. The used
method is compared to previously published results, by neglecting self-interaction.
We perform the first fully rigorous calculation for the J-factor, properly taking into
account the dark matter velocity distribution. We can deduce that a previously
used approximation of the self-interaction overestimates the J-factor by 1.5 orders
of magnitude. Furthermore, we confirm that our method produces three to four
orders of magnitudes larger values compared to J-factors without self-interaction.

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/256433/256433.pdf

OL 30