{"work":{"id":"5049ff4b-31ec-433e-b221-b432cab0fe57","openalex_id":null,"doi":null,"arxiv_id":"1705.02358","raw_key":null,"title":"Dark Matter Self-interactions and Small Scale Structure","authors":null,"authors_text":"S","year":2017,"venue":"hep-ph","abstract":"We review theories of dark matter (DM) beyond the collisionless paradigm, known as self-interacting dark matter (SIDM), and their observable implications for astrophysical structure in the Universe. Self-interactions are motivated, in part, due to the potential to explain long-standing (and more recent) small scale structure observations that are in tension with collisionless cold DM (CDM) predictions. Simple particle physics models for SIDM can provide a universal explanation for these observations across a wide range of mass scales spanning dwarf galaxies, low and high surface brightness spiral galaxies, and clusters of galaxies. At the same time, SIDM leaves intact the success of $\\Lambda$CDM cosmology on large scales. This report covers the following topics: (1) small scale structure issues, including the core-cusp problem, the diversity problem for rotation curves, the missing satellites problem, and the too-big-to-fail problem, as well as recent progress in hydrodynamical simulations of galaxy formation; (2) N-body simulations for SIDM, including implications for density profiles, halo shapes, substructure, and the interplay between baryons and self-interactions; (3) semi-analytic Jeans-based methods that provide a complementary approach for connecting particle models with observations; (4) merging systems, such as cluster mergers (e.g., the Bullet Cluster) and minor infalls, along with recent simulation results for mergers; (5) particle physics models, including light mediator models and composite DM models; and (6) complementary probes for SIDM, including indirect and direct detection experiments, particle collider searches, and cosmological observations. We provide a summary and critical look for all current constraints on DM self-interactions and an outline for future directions.","external_url":"https://arxiv.org/abs/1705.02358","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-09T12:16:13.971863+00:00","pith_arxiv_id":"1705.02358","created_at":"2026-05-09T05:50:27.415197+00:00","updated_at":"2026-07-09T12:16:13.971863+00:00","title_quality_ok":true,"display_title":"Dark Matter Self-interactions and Small Scale Structure","render_title":"Dark Matter Self-interactions and Small Scale Structure"},"hub":{"state":{"work_id":"5049ff4b-31ec-433e-b221-b432cab0fe57","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":55,"external_cited_by_count":null,"distinct_field_count":11,"first_pith_cited_at":"2019-06-25T04:15:55+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":"2026-08-23T22:59:22.002391+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":16},{"context_role":"dataset","n":1}],"polarity_counts":[{"context_polarity":"background","n":16},{"context_polarity":"use_dataset","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}