Hacker News new | past | comments | ask | show | jobs | submit login

Yes, but this just upper bounds the interaction strength rather than constrains it to be zero. Additionally, if there are multiple species of dark matter, there may be subpopulations (up to 10%, I think) that interact very strongly without conflicting with observation.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact