Cosmological parameter · ns
Scalar Spectral Index (ns)
The 'tilt' of the spectrum of primordial density fluctuations laid down by inflation — whether fluctuations have slightly more or less power on large scales than on small. A value just below one is a key prediction of, and constraint on, inflationary models, and is measured from the CMB.
Methods, objects & facilities
Knowledge connections
- Associated withCosmic Inflation
- Associated withThe Cosmic Microwave Background
Sources
The primary and reference sources this topic draws on.
- Planck CollaborationESA Planck mission / Planck Collaboration
Cosmic microwave background maps and the cosmological parameters of the ΛCDM model.