Running non-Gaussianities in Dirac-Born-Infeld inflation

By Xingang Chen. 2005

144 citations recorded by the source corpus.

We study the non-Gaussianity in the simplest infrared model of the Dirac-Born-Infeld (DBI) inflation. We show that the non-Gaussianity in such a model is compatible with the current observational bound and is within the sensitivity of future experiments. We also discuss the scale dependence of the non-Gaussianity. In DBI inflation, such a feature can be used as a probe to the properties of the background geometry of the extra dimensions or internal space.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6ca7971339d7f3bd2f397c4acc2bd88e7601589e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Primordial Non-Gaussianity and Bispectrum Measurements in the Cosmic Microwave Background and Large-Scale Structure (2010, background): “An additional but quite generic feature of these models is given by a significant departure from the hierarchical scaling BΦ(k, k, k) ∼ P2Φ(k) (Chen, 2005; Chen et al., 2007; Chen & Wang, 2009; Khoury & Piazza, 2008; Renaux-Petel, 2009; Shandera & Tye, 2006).”
Observational signatures and non-Gaussianities of general single-field inflation (2006, background): “In the region where the back-reaction [14,16,60] and stringy physics [16, 17 ] can be ignored, the effective action has the following form”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “, [37, 300, 301, 149] can be characterized by a primordial bispectrum whose amplitude varies significantly over the range of scales accessible by cosmological probes.”
Constraining primordial non-Gaussianity with future galaxy surveys (2011, methodology): “For this reason, a new parameter has been introduced by Chen (2005) in the equilateral case and by Byrnes et al. (2010) in the local case: the spectral index of nonGaussianity, n fNL , defined so that the effective fNL(k) is written as fNL(k) = f̄NL ( k kpiv )n fNL , (48) where f̄NL is the value of…”
The bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and non-linear galaxy bias (2007, methodology): “A fNL with a peculiar scale dependence unrelated to the power spectrum appears, for instance, in string-motivated models such as DBI inflation (Alishahiha et al. 2004; Chen 2005).”
Primordial Non-Gaussianities from Inflation Models (2010, background): “In this case, fNL is approximately a constant but can also have a mild running, that is, a weak dependence on the overall momentum K [61, 62].”
Planck 2018 results. IX. Constraints on primordial non-Gaussianity (2019, methodology): “A typical example is DBI-inflation, as studied, e.g., by Chen (2005) and Chen et al. (2007b), with a generalization within the effective field theory of inflation in Bartolo et al. (2010c).”