Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
, 96 (11), 111301

Inflationary Predictions for Scalar and Tensor Fluctuations Reconsidered

Affiliations

Inflationary Predictions for Scalar and Tensor Fluctuations Reconsidered

Latham A Boyle et al. Phys Rev Lett.

Abstract

We reconsider the predictions of inflation for the spectral index of scalar (energy density) fluctuations (ns) and the tensor/scalar ratio (r) using a discrete, model-independent measure of the degree of fine-tuning required to obtain a given combination of (ns, r ). We find that, except for cases with numerous unnecessary degrees of fine-tuning, ns is less than 0.98, measurably different from exact Harrison-Zel'dovich. Furthermore, if ns >or= 0.95, in accord with current measurements, the tensor/scalar ratio satisfies r >or= 10(-2), a range that should be detectable in proposed cosmic microwave background polarization experiments and direct gravitational wave searches.

Similar articles

  • Inflationary Tensor Perturbations After BICEP2
    J Caligiuri et al. Phys Rev Lett 112 (19), 191302. PMID 24877926.
    The measurement of B-mode polarization of the cosmic microwave background at large angular scales by the BICEP experiment suggests a stochastic gravitational wave backgro …
  • Dark Energy From Primordial Inflationary Quantum Fluctuations
    C Ringeval et al. Phys Rev Lett 105 (12), 121301. PMID 20867625.
    We show that current cosmic acceleration can be explained by an almost massless scalar field experiencing quantum fluctuations during primordial inflation. Provided its m …
  • Large Tensor-To-Scalar Ratio in Small-Field Inflation
    T Kobayashi et al. Phys Rev Lett 110 (23), 231101. PMID 25167480.
    We show that density perturbations seeded by the inflaton can be suppressed when having additional light degrees of freedom contributing to the production of perturbation …
  • Can Primordial Magnetic Fields Be the Origin of the BICEP2 Data?
    C Bonvin et al. Phys Rev Lett 112 (19), 191303. PMID 24877927.
    If the B-mode signal in the cosmic microwave background polarization seen by the BICEP2 experiment is confirmed, it has dramatic implications for models of inflation. The …
  • The Cosmic Microwave Background
    AW Jones et al. Living Rev Relativ 1 (1), 11. PMID 28191824. - Review
    We present a brief review of current theory and observations of the cosmic microwave background (CMB). New predictions for cosmological defect theories and an overview of …
See all similar articles
Feedback