Speaker
Description
Various alleged indirect dark matter search signals, such as the 511 keV line from galaxy center or the PAMELA/AMS02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or from the absence of an impact on CMB through delayed recombination. We propose a novel scenario to explain 511 keV signal, that can avoid these bounds based on the decay of dark matter, X, to a pair of intermediate particles C and \bar{C} with a lifetime much greater than the age of the universe. Having a small electric charge, these millicharged particles can be trapped by the galactic magnetic field. Moreover, we discuss how this scenario can provide a solution to AMS02 positron excess based on the decay of dark matter particles into intermediate millicharged particles. Finally, we will discuss how such a small charge can have interesting consequences including a signal in direct dark matter searches.
