{"paper":{"title":"Fundamental constants and high resolution spectroscopy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"10), (10) St.Petersburg Electrotechnical University `LETI', (11) Departamento de Astronomia, (2) IUCAA, (3) Centre for Astrophysics, (4) Hamburger Sternwarte, 5), (5) Institut f\\\"ur Physik und Astronomie, (6) INAF - OA Trieste (7) IAP, (8) Ioffe Physical-Technical Institute, (9) ESO, C. J. A. P. Martins (12), D. Reimers (4), G. Vladilo (6)((1) GEPI - Observatoire de Paris, H. Rahmani (2), I. I. Agafonova (8), J. B. Whitmore (3), M. Centurion (6), M. T. Murphy (3), M. Wendt (4, P. Bonifacio (1), P. Molaro (6), P. Petitjean (7), R. Srianand (2), S. A. Levshakov (8, S. D'Odorico (9), S. Lopez (11), Supercomputing, Swinburne University of Technology, T. M. Evans (3), Universidad de Chile (12) Centro de Astrof\\'isica, Universidade do Porto), Universit\\\"at Potsdam","submitted_at":"2013-10-23T16:19:13Z","abstract_excerpt":"Absorption-line systems detected in high resolution quasar spectra can be used to compare the value of dimensionless fundamental constants such as the fine-structure constant, alpha, and the proton-to-electron mass ratio, mu = m_p/m_e, as measured in remote regions of the Universe to their value today on Earth. In recent years, some evidence has emerged of small temporal and also spatial variations in alpha on cosmological scales which may reach a fractional level of 10 ppm . We are conducting a Large Programme of observations with VLT UVES to explore these variations. We here provide a genera"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.6280","kind":"arxiv","version":1},"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"}