Indirect detection of long-lived particles in a rich dark sector with a
  dark Higgs boson portal
  Simplified models of light new physics provide a convenient benchmark for
experimental searches for new physics signatures, including dark matter.
However, in less simplified - and more realistic - scenarios invoking
additional degrees of freedom additional modes of detection may arise. In this
study, we examine a model in which the dark sector couples to the Standard
Model sector via a light dark Higgs boson portal but it also contains a
secluded scalar dark matter candidate with the mass around the TeV scale. In
this model, involving both light and heavy particles in the dark sector, we
find some new interesting phenomenological features that allow one to avoid
otherwise stringent cosmological bounds and lead to new complementary probes in
intensity frontier searches for light long-lived particles, in indirect
detection searches for dark matter and cosmic microwave background surveys. We
also highlight possible non-local effects present in the indirect detection
searches for dark matter that could significantly affect usual detection
strategies and allow one to distinguish this model from the usual signatures
based on simplified models.
