Münster 2017 – wissenschaftliches Programm
T 62.5: Vortrag
Dienstag, 28. März 2017, 17:45–18:00, VSH 17
Dark matter decay through gravity portals — Oscar Catà1, Alejandro Ibarra2, and •Sebastian Ingenhütt2,3 — 1Ludwig-Maximilians-Universität München — 2Technische Universität München — 3Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)
Motivated by the fact that, so far, the whole body of evidence for dark matter is of gravitational origin, we study the decays of dark matter into Standard Model particles mediated by gravity portals, i.e., through nonminimal gravitational interactions of dark matter. We investigate the decays in several widely studied frameworks of scalar and fermionic dark matter where the dark matter is stabilized in flat spacetime via global symmetries. We find that the constraints on the scalar singlet dark matter candidate are remarkably strong and exclude large regions of the parameter space, suggesting that an additional stabilizing symmetry should be in place. In contrast, the scalar doublet and the fermionic singlet candidates are naturally protected against too fast decays by gauge and Lorentz symmetry, respectively. For a nonminimal coupling parameter ξ∼ O(1), decays through the gravity portal are consistent with observations if the dark matter mass is smaller than ∼ 105 GeV, for the scalar doublet, and ∼ 106 GeV, for the fermionic singlet.