Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió acceptadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/127542
Isocurvature modes and Baryon Acoustic Oscillations
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly.
Matèries
Matèries (anglès)
Citació
Citació
MANGILLI, Anna, VERDE, Licia, BELTRAN, Maria. Isocurvature modes and Baryon Acoustic Oscillations. _Journal of Cosmology and Astroparticle Physics_. 2010. Vol. JCAP10(2010), núm. 10, pàgs. 09. [consulta: 21 de gener de 2026]. ISSN: 1475-7516. [Disponible a: https://hdl.handle.net/2445/127542]