scholarly journals Model-independent constraints on dark matter annihilation in dwarf spheroidal galaxies

2018 ◽  
Vol 97 (9) ◽  
Author(s):  
Kimberly K. Boddy ◽  
Jason Kumar ◽  
Danny Marfatia ◽  
Pearl Sandick
Keyword(s):  
Dark Matter ◽  
Dark Matter Annihilation ◽  
Dwarf Spheroidal Galaxies ◽  
Model Independent ◽  
Spheroidal Galaxies

scholarly journals Dark matter annihilation and decay in dwarf spheroidal galaxies: the classical and ultrafaint dSphs

2015 ◽  
Vol 453 (1) ◽  
pp. 849-867 ◽  
Author(s):  
V. Bonnivard ◽  
C. Combet ◽  
M. Daniel ◽  
S. Funk ◽  
A. Geringer-Sameth ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Annihilation ◽  
Dwarf Spheroidal Galaxies ◽  
Spheroidal Galaxies

scholarly journals New constraints on the mass of fermionic dark matter from dwarf spheroidal galaxies

2020 ◽  
Vol 501 (1) ◽  
pp. 1188-1201
Author(s):  
James Alvey ◽  
Nashwan Sabti ◽  
Victoria Tiki ◽  
Diego Blas ◽  
Kyrylo Bondarenko ◽  
...  
Keyword(s):  
Dark Matter ◽  
Phase Space ◽  
Pauli Principle ◽  
Big Bang ◽  
Big Bang Nucleosynthesis ◽  
Sterile Neutrinos ◽  
Dwarf Spheroidal Galaxies ◽  
Dark Matter Mass ◽  
Model Independent ◽  
Spheroidal Galaxies

ABSTRACT Dwarf spheroidal galaxies are excellent systems to probe the nature of fermionic dark matter due to their high observed dark matter phase-space density. In this work, we review, revise, and improve upon previous phase-space considerations to obtain lower bounds on the mass of fermionic dark matter particles. The refinement in the results compared to previous works is realized particularly due to a significantly improved Jeans analysis of the galaxies. We discuss two methods to obtain phase-space bounds on the dark matter mass, one model-independent bound based on Pauli’s principle, and the other derived from an application of Liouville’s theorem. As benchmark examples for the latter case, we derive constraints for thermally decoupled particles and (non-)resonantly produced sterile neutrinos. Using the Pauli principle, we report a model-independent lower bound of $m \ge 0.18\, \mathrm{keV}$ at 68 per cent CL and $m \ge 0.13\, \mathrm{keV}$ at 95 per cent CL. For relativistically decoupled thermal relics, this bound is strengthened to $m \ge 0.59\, \mathrm{keV}$ at 68 per cent CL and $m \ge 0.41\, \mathrm{keV}$ at 95 per cent CL, while for non-resonantly produced sterile neutrinos the constraint is $m \ge 2.80\, \mathrm{keV}$ at 68 per cent CL and $m \ge 1.74\, \mathrm{keV}$ at 95 per cent CL. Finally, the phase-space bounds on resonantly produced sterile neutrinos are compared with complementary limits from X-ray, Lyman α, and big bang nucleosynthesis observations.

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