Abstract |
: |
[eng] An effective theory for dark matter has recently been proposed. The key
assumption is that the dark matter particle which is a Dirac fermion is
protected from decaying by a global U(1) symmetry. We point out that quantum
gravity effects will violate this symmetry and that the dark matter candidate
thus decays very fast. In order to solve that problem, we propose to consider a
local gauge symmetry which implies a new force in the dark matter sector. It is
likely that this new local U(1) symmetry will need to be spontaneously broken
leading for a range of the parameters of the model to a Sommerfeld enhancement
of the annihilation cross-sections which is useful to explain the Pamela and
ATIC results using a weakly interacting massive particle with a mass in the TeV
range.
Comment: 6 pages |