Probing the power spectrum bend with recent CMB data
arXiv:astro-ph/0012009 · doi:10.1016/S0927-6505(01)00103-7
Abstract
We constrain the primordial fluctuation spectrum P(k) by using the new data on the Cosmic Microwave Background (CMB) from the Boomerang and MAXIMA experiments. Our study is based on slow-roll inflationary models, and we consider the possibility of a running spectral index. Specifically, we expand the power spectrum P(k) to second order in ln(k), thus allowing the power spectrum to ``bend'' in k-space. We show that allowing the power spectrum to bend erases the ability of the present data to measure the tensor to scalar perturbation ratio. Moreover, if the primordial baryon density Ω_b h^2 is as low as found from Big Bang nucleosynthesis (BBN), the data favor a negative bending of the power spectrum, corresponding to a bump-like feature in the power spectrum around a scale of k=0.004 Mpc^-1.
14 pages, 6 figures, version to appear in Astropart. Physics
Cited by in corpus (33)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Implications for Inflation
- Neutrino masses and the number of neutrino species from WMAP and 2dFGRS
- Tension between the power spectrum of density perturbations measured on large and small scales
- WMAPping inflationary physics
- Running Spectral Index and Formation of Primordial Black Hole in Single Field Inflation Models
- Reconstructing the primordial power spectrum - a new algorithm
- Running of the Scalar Spectral Index from Inflationary Models
- Features in Dark Energy Equation of State and Modulations in the Hubble Diagram
- Scale Dependent Spectral Index in Slow Roll Inflation
- Constraints on inflation from CMB and Lyman-alpha forest
- Determining Cosmological Parameters with Latest Observational Data
- Inflationary Potential Reconstruction for a WMAP Running Power Spectrum
- Suppressing the impact of a high tensor-to-scalar ratio on the temperature anisotropies
- Inflationary potentials yielding constant scalar perturbation spectral indices
- Constraining the shape of the CMB: a Peak-by-Peak analysis
- Natural Inflation, Planck Scale Physics and Oscillating Primordial Spectrum
- Observational constraints on particle production during inflation
- Cosmological limit on the neutrino mass
- Can Planck-scale physics be seen in the cosmic microwave background ?
- New Constraints on the running-mass inflation model
- Wavelet Band Powers of the Primordial Power Spectrum from CMB Data
- Features in the primordial power spectrum: constraints from the CMB and the limitation of the 2dF and SDSS redshift surveys to detect them
- Principal Component Analysis of the Cosmic Microwave Background Anisotropies: Revealing The Tensor Degeneracy
- Observational constraints on the inflaton potential combined with flow-equations in inflaton space
- Supergravity Minimal Inflation and its Spectral Index Revisited
- Running of the Spectral Index in Noncommutative Inflation
- Observational constraint on the fourth derivative of the inflaton potential
- Large and small field inflation from hyperbolic sigma models
- A falsely fat curvaton with an observable running of the spectral tilt
- Slow-roll reconstruction for running spectral index
- Warm Dark Matter versus Bumpy Power Spectra
- Further evidences for a generic Universe
- Cosmology Rounding the Cape