{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,10]],"date-time":"2026-04-10T20:17:16Z","timestamp":1775852236364,"version":"3.50.1"},"reference-count":57,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2022,10,6]],"date-time":"2022-10-06T00:00:00Z","timestamp":1665014400000},"content-version":"vor","delay-in-days":5,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2022,7,15]]},"published-print":{"date-parts":[[2022,10]]},"abstract":"<jats:p><jats:italic>Context.<\/jats:italic> The spectrograph ESPRESSO recently obtained a limit on the variation of the fine-structure constant, <jats:italic>\u03b1<\/jats:italic>, through measurements along the line of sight of a bright quasar with a precision of 1.36 ppm at 1<jats:italic>\u03c3<\/jats:italic> level. This imposes new constraints on cosmological models with a varying <jats:italic>\u03b1<\/jats:italic>. We assume such a model where the electromagnetic sector is coupled to a scalar field dark energy responsible for the current acceleration of the Universe. We parametrise the variation of <jats:italic>\u03b1<\/jats:italic> with two extra parameters, one defining the cosmological evolution of the quintessence component and the other fixing the coupling with the electromagnetic field.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> The objective of this work is to constrain these parameters with both astrophysical and local probes. We also carried out a comparative analysis of how each data probe may constrain our parametrisation.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> We performed a Bayesian analysis by comparing the predictions of the model with observations. The astrophysical datasets are composed of quasar spectra measurements, including the latest ESPRESSO data point, as well as <jats:italic>Planck<\/jats:italic> observations of the cosmic microwave background. We combined these with local results from atomic clocks and the MICROSCOPE experiment.<\/jats:p>\n<jats:p><jats:italic>Results.<\/jats:italic> The constraints placed on the quintessence parameter are consistent with a null variation of the field, and are therefore compatible with a \u039bCDM cosmology. The constraints on the coupling to the electromagnetic sector are dominated by the E\u00f6tv\u00f6s parameter local bound.<\/jats:p>\n<jats:p><jats:italic>Conclusions.<\/jats:italic> More precise measurements with ESPRESSO will be extremely important to study the cosmological evolution of <jats:italic>\u03b1<\/jats:italic> as it probes an interval of redshift not accessible to other types of observations. However, for this particular model, current available data favour a null variation of <jats:italic>\u03b1<\/jats:italic> resulting mostly from the strong MICROSCOPE limits.<\/jats:p>","DOI":"10.1051\/0004-6361\/202243795","type":"journal-article","created":{"date-parts":[[2022,7,29]],"date-time":"2022-07-29T18:50:02Z","timestamp":1659120602000},"page":"A57","source":"Crossref","is-referenced-by-count":9,"title":["Fundamental physics with ESPRESSO: Constraining a simple parametrisation for varying <i>\u03b1<\/i>"],"prefix":"10.1051","volume":"666","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8436-6445","authenticated-orcid":false,"given":"Vitor","family":"da Fonseca","sequence":"first","affiliation":[]},{"given":"Tiago","family":"Barreiro","sequence":"additional","affiliation":[]},{"given":"Nelson J.","family":"Nunes","sequence":"additional","affiliation":[]},{"given":"Stefano","family":"Cristiani","sequence":"additional","affiliation":[]},{"given":"Guido","family":"Cupani","sequence":"additional","affiliation":[]},{"given":"Valentina","family":"D\u2019Odorico","sequence":"additional","affiliation":[]},{"given":"Ana C. 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