Double-Disk Dark Matter

摘要: Abstract Based on observational tests of large scale structure and constraints halo structure, dark matter is generally taken to be cold essentially collisionless. On the other hand, given number particles forces in visible world, a more complex sector could reasonable or even likely possibility. This hypothesis leads testable consequences, perhaps portending discovery rich hidden world neighboring our own. We consider scenario that readily satisfies current bounds we call Partially Interacting Dark Matter (PIDM). contains self-interacting matter, but it not dominant component. Even if PIDM only fraction net density, comparable baryonic fraction, subdominant component’s interactions can lead interesting potentially observable consequences. Our primary focus will special case Double-Disk (DDDM), which self-interactions allow lose enough energy dynamics similar those sector. explore simple model DDDM cool efficiently form disk within galaxies, evaluate some possible signatures. The most prominent signal such an enhanced indirect detection signature with distinctive spatial distribution. though subdominant, density at center galaxy possibly throughout plane (depending precise alignment) boost factors, explain as 130 GeV Fermi line. Such scenarios also predict additional radiation degrees freedom soon detectable would influence interpretation future data, from Planck Gaia satellite. this first step toward exploring array new possibilities for dynamics.