Estamos realizando la búsqueda. Por favor, espere...


Planck constraints on the tensor-to-scalar ratio

Abstract: We present constraints on the tensor-to-scalar ratio r using Planck data. We use the latest release of Planck maps, processed with the NPIPE code, which produces calibrated frequency maps in temperature and polarisation for all Planck channels from 30 GHz to 857 GHz using the same pipeline. We computed constraints on r using the BB angular power spectrum, and we also discuss constraints coming from the TT spectrum. Given Planck?s noise level, the TT spectrum gives constraints on r that are cosmic-variance limited (with ?r?=?0.093), but we show that the marginalised posterior peaks towards negative values of r at about the 1.2? level. We derived Planck constraints using the BB power spectrum at both large angular scales (the ?reionisation bump?) and intermediate angular scales (the ?recombination bump?) from ? = 2 to 150 and find a stronger constraint than that from TT, with ?r?=?0.069. The Planck BB spectrum shows no systematic bias and is compatible with zero, given both the statistical noise and the systematic uncertainties. The likelihood analysis using B modes yields the constraint r

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Tristram M., Banday A.J., Górski K.M., Keskitalo R., Lawrence C.R., Andersen K.J., Barreiro R.B., Borrill J., Eriksen H.K., Fernandez-Cobos R., Kisner T.S., Martínez-González E., Partridge B., Scott D., Svalheim T.L., Thommesen H., Wehus I.K.,

 Fuente: Astronomy and Astrophysics, 2021, 647(A128), 1-19

Editorial: EDP Sciences

 Año de publicación: 2021

Nº de páginas: 18

Tipo de publicación: Artículo de Revista

 DOI: 10.1051/0004-6361/202039585

ISSN: 0004-6361,1432-0746

Url de la publicación: https://doi.org/10.1051/0004-6361/202039585