Lensing dispersion of SNIa and small scales of the primordial power spectrum
arXiv:1408.3004
Abstract
Probing the primordial power spectrum at small scales is crucial for discerning inflationary models, especially if BICEP2 results are confirmed. We demonstrate this necessity by briefly reviewing single small field models that give a detectable gravitational waves signal, thus being degenerate with large field models on CMB scales. A distinct prediction of these small field models is an enhancement of the power spectrum at small scales, lifting up the degeneracy. We propose a way to detect this enhancement, and more generally, different features in the power spectrum at small scales by considering the existing data of lensing dispersion in Type Ia supernovae. We show that for various deviations from the simplest the lensing dispersion cuts considerably into the allowed parameter space by PLANCK and constrains the spectrum to smaller scales beyond the reach of other current data sets.
arXiv comment6 pages, 2 figures, extended reference list, to appear as Proceedings of the XLIXth RENCONTRES DE MORIOND, Cosmology session
References in corpus (26)
- Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
- BICEP2 I: Detection Of B-mode Polarization at Degree Angular Scales
- Higgs inflation at the critical point
- Light-cone averaging in cosmology: formalism and applications
- Teasing bits of information out of the CMB energy spectrum
- Particle Production During Inflation: Observational Constraints and Signatures
- Do stochastic inhomogeneities affect dark-energy precision measurements?
- Constraining dark matter halo properties using lensed SNLS supernovae
- The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: weighing the neutrino mass using the galaxy power spectrum of the CMASS sample
- Cosmic Microwave Background Observables of Small Field Models of Inflation
- Hierarchical Axion Inflation
- Higgs-Dilaton cosmology: Universality vs. criticality
- BICEP2 implications for single-field slow-roll inflation revisited
- Accurate weak lensing of standard candles. I. Flexible cosmological fits
- The Effect of Weak Lensing on Distance Estimates from Supernovae
- Towards Natural Inflation in String Theory
- Accurate Weak Lensing of Standard Candles. II. Measuring sigma8 with Supernovae
- Reconstructing inflationary potential from BICEP2 and running of tensor modes
- First measurement of using supernova magnitudes only
- Bayesian constraints on dark matter halo properties using gravitationally-lensed supernovae
- Helical Inflation and Cosmic Strings
- Constraining the primordial power spectrum from SNIa lensing dispersion
- Clearing the Brush: The Last Stand of Solo Small Field Inflation
- Lensing dispersion of supernova flux: a probe of nonlinear structure growth
- On the Lyth bound and single field slow-roll inflation
- Observable Gravitational Waves and Spectral Index Running in Small Single Field Inflationary Models