Correlated perturbations from inflation and the cosmic microwave background

• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Correlated perturbations from inflation and the cosmic microwave background
• Verf.angabe: Luca Amendola, Christopher Gordon, David Wands, and Misao Sasaki
• Fussnoten: Gesehen am 17.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2002
• Band/Heft Quelle: 88(2002,21) Artikel-Nummer 211302, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.88.211302
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565452607

Abstract

We compare the latest cosmic microwave background data with theoretical predictions including correlated adiabatic and cold dark matter (CDM) isocurvature perturbations with a simple power-law dependence. We find that there is a degeneracy between the amplitude of correlated isocurvature perturbations and the spectral tilt. A negative (red) tilt is found to be compatible with a larger isocurvature contribution. Estimates of the baryon and CDM densities are found to be almost independent of the isocurvature amplitude. The main result is that current microwave background data do not exclude a dominant contribution from CDM isocurvature fluctuations on large scales.