Date and time: May 17th at 10 CET
Speaker: Andrea Caputo
Abstract: Pani (2015) updated upon a nice way to constrain the dark matter density using binary pulsars. The idea is that during the motion of a binary pulsar around the Galactic center, the pulsar and its companion experience a wind of dark-matter particles that would lead to a change in the orbital period, that might be detectable given the astonishing precision timing of pulsars. However, Pani (2015) only considered a smooth background dark matter density, which results in too weak constraints. We focus instead our analysis in the interesting and rich scenario of a dark disk (DD); in particular we look upon the model proposed by Fan et al (2013) for a Double-Disk Dark Matter(DDDM). In this case, the enhancement in the signal is manifest, and it is due to different causes: higher dark matter density, lower velocity dispersion for dark matter particles and binary's co-rotation with DD.