First constraints on the running of non-Gaussianity
arXiv:1207.5788 · doi:10.1103/PhysRevLett.109.121302
Abstract
We use data from the WMAP temperature maps to constrain a scale-dependent generalization of the popular 'local' model for primordial non-Gaussianity. In the model where the parameter fNL is allowed to run with scale k, fNL(k) = fNL* (k/k_piv)^n, we constrain the running to be n = 0.30(+1.9)(-1.2) at 95% confidence, marginalized over the amplitude fNL*. The constraints depend somewhat on the prior probabilities assigned to the two parameters. In the near future, constraints from a combination of Planck and large-scale structure surveys are expected to improve this limit by about an order of magnitude and usefully constrain classes of inflationary models.
Accepted for publication in Physical Review Letters
References in corpus (14)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
- Effects of Scale-Dependent Non-Gaussianity on Cosmological Structures
- Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
- Optimal limits on f_{NL}^{local} from WMAP 5-year data
- Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect
- Scale-dependent non-Gaussianity probes inflationary physics
- CMB Constraints on Primordial non-Gaussianity from the Bispectrum (f_{NL}) and Trispectrum (g_{NL} and τ_{NL}) and a New Consistency Test of Single-Field Inflation
- Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations
- A generalized local ansatz and its effect on halo bias
- Scale-dependence of Non-Gaussianity in the Curvaton Model
- Strongly Scale-dependent Non-Gaussianity
- Scale-Dependent Non-Gaussianity as a Generalization of the Local Model
- Runnings in the Curvaton
Cited by in corpus (5)
- Constraints on primordial non-Gaussianity from 800,000 photometric quasars
- Probing the scale dependence of non-Gaussianity with spectral distortions of the cosmic microwave background
- Testing the Running of non-Gaussianity through the CMB mu-distortion and the Halo Bias
- Scale and shape dependent non-Gaussianity in the presence of inflationary vector fields
- Testing primordial non-Gaussianities on galactic scales at high redshift