E-viri
Odprti dostop
-
Vitor da Fonseca; Barreiro, Tiago; Nunes, Nelson J; Cristiani, Stefano; Cupani, Guido; D'Odorico, Valentina; Ricardo Génova Santos; Leite, Ana C O; Marques, Catarina M J; Carlos J A P Martins; Milaković, Dinko; Molaro, Paolo; Murphy, Michael T; Schmidt, Tobias M; Abreu, Manuel; Adibekyan, Vardan; Cabral, Alexandre; Paolo Di Marcantonio; González Hernández, Jonay I; Palle, Enric; Pepe, Francesco A; Rebolo, Rafael; Santos, Nuno C; Sousa, Sérgio G; Sozzetti, Alessandro; Alejandro Suárez Mascareño; Maria-Rosa Zapatero Osorio
arXiv.org, 11/2022Paper
The spectrograph ESPRESSO recently obtained a limit on the variation of the fine-structure constant, \(\alpha\), through measurements along the line of sight of a bright quasar with a precision of \(1.36\) ppm at \(1\sigma\) level. This imposes new constraints on cosmological models with a varying \(\alpha\). 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 \(\alpha\) with two extra parameters, one defining the cosmological evolution of the quintessence component and the other fixing the coupling with the electromagnetic field. 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. 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 Planck observations of the cosmic microwave background. We combined these with local results from atomic clocks and the MICROSCOPE experiment. The constraints placed on the quintessence parameter are consistent with a null variation of the field, and are therefore compatible with a \(\Lambda\)CDM cosmology. The constraints on the coupling to the electromagnetic sector are dominated by the E\"otv\"os parameter local bound. More precise measurements with ESPRESSO will be extremely important to study the cosmological evolution of \(\alpha\) 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 \(\alpha\) resulting mostly from the strong MICROSCOPE limits.
Avtor
![loading ... loading ...](themes/default/img/ajax-loading.gif)
Vnos na polico
Trajna povezava
- URL:
Faktor vpliva
Dostop do baze podatkov JCR je dovoljen samo uporabnikom iz Slovenije. Vaš trenutni IP-naslov ni na seznamu dovoljenih za dostop, zato je potrebna avtentikacija z ustreznim računom AAI.
Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
---|---|---|---|---|---|---|---|---|
JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
Baze podatkov, v katerih je revija indeksirana
Ime baze podatkov | Področje | Leto |
---|
Povezave do osebnih bibliografij avtorjev | Povezave do podatkov o raziskovalcih v sistemu SICRIS |
---|
Vir: Osebne bibliografije
in: SICRIS
To gradivo vam je dostopno v celotnem besedilu. Če kljub temu želite naročiti gradivo, kliknite gumb Nadaljuj.