{"work":{"id":"226fee18-690f-45fa-b4c8-8854be9e86e2","openalex_id":null,"doi":"10.48550/arxiv.2511.07517","arxiv_id":"2511.07517","raw_key":null,"title":"The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration","authors":null,"authors_text":null,"year":2025,"venue":"astro-ph.CO","abstract":"We present improved cosmological constraints from a re-analysis of the Dark Energy Survey (DES) 5-year sample of Type Ia supernovae (DES-SN5YR). This re-analysis includes an improved photometric cross-calibration, recent white dwarf observations to cross-calibrate between DES and low redshift surveys, retraining the SALT3 light curve model and fixing a numerical approximation in the host galaxy colour law. Our fully recalibrated sample, which we call DES-Dovekie, comprises $\\sim$1600 likely Type Ia SNe from DES and $\\sim$200 low-redshift SNe from other surveys. With DES-Dovekie, we obtain $\\Omega_{\\rm m} = 0.330 \\pm 0.015$ in Flat $\\Lambda$CDM which changes $\\Omega_{\\rm m}$ by $-0.022$ compared to DES-SN5YR. Combining DES-Dovekie with CMB data from Planck, ACT and SPT and the DESI DR2 measurements in a Flat $w_0 w_a$CDM cosmology, we find $w_0 = -0.803 \\pm 0.054$, $w_a = -0.72 \\pm 0.21$. Our results hold a significance of $3.2\\sigma$, reduced from $4.2\\sigma$ for DES-SN5YR, to reject the null hypothesis that the data are compatible with the cosmological constant. This significance is equivalent to a Bayesian model preference odds of approximately 5:1 in favour of the Flat $w_0 w_a$CDM model. Using generally accepted thresholds for model preference, our updated data exhibits only a weak preference for evolving dark energy.","external_url":"https://arxiv.org/abs/2511.07517","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-10T18:27:31.389600+00:00","pith_arxiv_id":"2511.07517","created_at":"2026-05-10T03:14:07.626304+00:00","updated_at":"2026-07-10T18:27:31.389600+00:00","title_quality_ok":true,"display_title":"The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration","render_title":"The Dark Energy Survey Supernova Program: A Reanalysis Of Cosmology Results And Evidence For Evolving Dark Energy With An Updated Type Ia Supernova Calibration"},"hub":{"state":{"work_id":"226fee18-690f-45fa-b4c8-8854be9e86e2","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":57,"external_cited_by_count":null,"distinct_field_count":4,"first_pith_cited_at":"2025-11-25T19:00:04+00:00","last_pith_cited_at":"2026-07-08T17:38:46+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":"2026-08-14T11:39:22.154133+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"dataset","n":13},{"context_role":"background","n":11},{"context_role":"method","n":1}],"polarity_counts":[{"context_polarity":"use_dataset","n":13},{"context_polarity":"background","n":10},{"context_polarity":"support","n":1},{"context_polarity":"use_method","n":1}],"runs":{},"summary":{},"graph":{},"authors":[]}}