John Giblin

Dec 18, 2023 | link.aps.org | Tristan Smith |Swarthmore College |John Giblin |Kenyon College

We study the nonlinear effects of minimally coupled, massless, cosmological scalar fields on the cosmic microwave background (CMB). These fields can exhibit postrecombination parametric resonance and subsequent nonlinear evolution leading to novel contributions to the gravitational potential. We compute the resulting contributions to the CMB temperature anisotropies through the time variation of the gravitational potential (i.e., the integrated Sachs-Wolfe (ISW) effect).

Nov 9, 2023 | hal.science | Matthew Carney |John Giblin |Saurabh Kumar |Stefano Anselmi

What is flat ΛCDM, and may we choose it? Mots clés inflation: model curvature: 0 cosmological model: parameter space dark matter boundary condition tension wide-angle fluctuation cosmic background radiation tracks anomaly Fichier principal Anselmi_2023_J._Cosmol._Astropart._Phys._2023_049.pdf (640.14 Ko) Télécharger le fichier Origine : Fichiers éditeurs autorisés sur une archive ouverte