{"work":{"id":"ce6a8c9a-70a6-448e-9706-59019b463903","openalex_id":null,"doi":null,"arxiv_id":"astro-ph/0501171","raw_key":null,"title":"Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies","authors":null,"authors_text":"D","year":2005,"venue":"astro-ph","abstract":"We present the large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies from the Sloan Digital Sky Survey. The survey region covers 0.72 h^{-3} Gpc^3 over 3816 square degrees and 0.16<z<0.47, making it the best sample yet for the study of large-scale structure. We find a well-detected peak in the correlation function at 100h^{-1} Mpc separation that is an excellent match to the predicted shape and location of the imprint of the recombination-epoch acoustic oscillations on the low-redshift clustering of matter. This detection demonstrates the linear growth of structure by gravitational instability between z=1000 and the present and confirms a firm prediction of the standard cosmological theory. The acoustic peak provides a standard ruler by which we can measure the ratio of the distances to z=0.35 and z=1089 to 4% fractional accuracy and the absolute distance to z=0.35 to 5% accuracy. From the overall shape of the correlation function, we measure the matter density Omega_mh^2 to 8% and find agreement with the value from cosmic microwave background (CMB) anisotropies. Independent of the constraints provided by the CMB acoustic scale, we find Omega_m = 0.273 +- 0.025 + 0.123 (1+w_0) + 0.137 Omega_K. Including the CMB acoustic scale, we find that the spatial curvature is Omega_K=-0.010+-0.009 if the dark energy is a cosmological constant. More generally, our results provide a measurement of cosmological distance, and hence an argument for dark energy, based on a geometric method with the same simple physics as the microwave background anisotropies. The standard cosmological model convincingly passes these new and robust tests of its fundamental properties.","external_url":"https://arxiv.org/abs/astro-ph/0501171","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-02T01:26:24.363397+00:00","pith_arxiv_id":"astro-ph/0501171","created_at":"2026-05-10T14:40:48.863917+00:00","updated_at":"2026-07-02T01:26:24.363397+00:00","title_quality_ok":true,"display_title":"Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies","render_title":"Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies"},"hub":{"state":{"work_id":"ce6a8c9a-70a6-448e-9706-59019b463903","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":39,"external_cited_by_count":null,"distinct_field_count":6,"first_pith_cited_at":"2016-10-31T20:47:42+00:00","last_pith_cited_at":"2026-06-26T04:44:56+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":"2026-07-02T02:52:08.808350+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":17},{"context_role":"method","n":1}],"polarity_counts":[{"context_polarity":"background","n":16},{"context_polarity":"unclear","n":1},{"context_polarity":"use_method","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}