{"paper":{"title":"The NANOGrav 11-year Data Set: Pulsar-timing Constraints On The Stochastic Gravitational-wave Background","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"A. Brazier, A. N. Lommen, A. Rasskazov, B. Christy, C. M. F. Mingarelli, C. Ng, D. J. Nice, D. L. Kaplan, D. R. Lorimer, D. R. Madison, D. R. Stinebring, E. A. Huerta, E. Ferrara, E. Fonseca, F. Crawford, G. Jones, H. Thankful Cromartie, I. H. Stairs, J. A. Ellis, J. Luo, J. M. Cordes, J. S. Hazboun, J. Simon, J. Swiggum, K. Crowter, K. Islo, K. Stovall, L. Levin, M. A. McLaughlin, M. DeCesar, M. L. Jones, M. T. Lam, M. Vallisneri, N. Garver-Daniels, N. J. Cornish, N. S. Pol, P. A. Gentile, P. B. Demorest, P. S. Ray, P. T. Baker, R. D. Ferdman, R. Haas, R. S. Lynch, R. S. Park, R. Spiewak, S. Burke-Spolaor, S. Chatterjee, S. J. Chamberlin, S. M. Ransom, S. R. Taylor, S. T. McWilliams, S. Vigeland, T. Dolch, T. J. W. Lazio, T. T. Pennucci, V. M. Kaspi, W. M. Folkner, W. W. Zhu, X. Siemens, Z. Arzoumanian","submitted_at":"2018-01-08T18:59:08Z","abstract_excerpt":"We search for an isotropic stochastic gravitational-wave background (GWB) in the newly released $11$-year dataset from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). While we find no significant evidence for a GWB, we place constraints on a GWB from a population of supermassive black-hole binaries, cosmic strings, and a primordial GWB. For the first time, we find that the GWB upper limits and detection statistics are sensitive to the Solar System ephemeris (SSE) model used, and that SSE errors can mimic a GWB signal. We developed an approach that bridges systemati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.02617","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}