Reheating in two sector cosmology: Right after the end of inflation, the inflaton field can decay into both Standard Model and hidden sector particles. We discuss how the temperature ratio between the two sectors depends on the inflaton decay rates.
Late decaying dark matter as an explanation of AMS-02 positron excess: The AMS-02 experiment aboard the ISS detected an anomalously large value of positron flux in the cosmic rays. We show that a model where dark matter produced in the early universe decays into a new dark matter particle in the late universe, can explain AMS-02 observation and satisfy constraints from CMB.
