{"work":{"id":"51d1247a-945f-486b-8657-fa0bd67fede2","openalex_id":null,"doi":null,"arxiv_id":"1302.3898","raw_key":null,"title":"Beyond Collisionless Dark Matter: Particle Physics Dynamics for Dark Matter Halo Structure","authors":null,"authors_text":"S","year":2013,"venue":"hep-ph","abstract":"Dark matter (DM) self-interactions have important implications for the formation and evolution of structure, from dwarf galaxies to clusters of galaxies. We study the dynamics of self-interacting DM via a light mediator, focusing on the quantum resonant regime where the scattering cross section has a non-trivial velocity dependence. While there are long-standing indications that observations of small scale structure in the Universe are not in accord with the predictions of collisionless DM, theoretical study and simulations of DM self-interactions have focused on parameter regimes with simple analytic solutions for the scattering cross section, with constant or classical velocity (and no angular) dependence. We devise a method that allows us to explore the velocity and angular dependence of self-scattering more broadly, in the strongly-coupled resonant and classical regimes where many partial modes are necessary for the achieving the result. We map out the entire parameter space of DM self-interactions --- and implications for structure observations --- as a function of the coupling and the DM and mediator masses. We derive a new analytic formula for describing resonant s-wave scattering. Finally, we show that DM self-interactions can be correlated with observations of Sommerfeld enhancements in DM annihilation through indirect detection experiments.","external_url":"https://arxiv.org/abs/1302.3898","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-09T12:16:13.808603+00:00","pith_arxiv_id":"1302.3898","created_at":"2026-05-10T10:09:06.777407+00:00","updated_at":"2026-07-09T12:16:13.808603+00:00","title_quality_ok":true,"display_title":"Beyond Collisionless Dark Matter: Particle Physics Dynamics for Dark Matter Halo Structure","render_title":"Beyond Collisionless Dark Matter: Particle Physics Dynamics for Dark Matter Halo Structure"},"hub":{"state":{"work_id":"51d1247a-945f-486b-8657-fa0bd67fede2","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":17,"external_cited_by_count":null,"distinct_field_count":7,"first_pith_cited_at":"2019-07-09T15:47:40+00:00","last_pith_cited_at":"2026-07-08T13:38:59+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-08-07T08:03:10.567670+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":6},{"context_role":"method","n":2}],"polarity_counts":[{"context_polarity":"background","n":6},{"context_polarity":"use_method","n":2}],"runs":{},"summary":{},"graph":{},"authors":[]}}