# Running spectral index from large-field inflation with modulations revisited

@article{Czerny2014RunningSI,
title={Running spectral index from large-field inflation with modulations revisited},
author={Michael Czerny and Takeshi Kobayashi and Fuminobu Takahashi},
journal={Physics Letters B},
year={2014},
volume={735},
pages={176-180}
}
• Published 18 March 2014
• Physics, Economics
• Physics Letters B
41 Citations

## Figures from this paper

### Simple single field inflation models and the running of spectral index

• Physics
• 2014
The BICEP2 experiment confirms the existence of primordial gravitational wave with the tensor-to-scalar ratio r = 0 ruled out at 7σ level. The consistency of this large value of r with the Planck

### Axion monodromy inflation with multi-natural modulations

• Physics
• 2014
We study parameter space in the axion monodromy inflation corrected by dynamically generated terms involving with the axion. The potential has the linear term with multiple sinusoidal functions,

### Beginning of Universe through large field hybrid inflation

• Physics
• 2015
Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies the so-called large field inflation, where an inflaton field takes super-Planckian

### Natural inflation with and without modulations in type IIB string theory

• Physics
• 2014
A bstractWe propose a mechanism for the natural inflation with and without modulation in the framework of type IIB string theory on toroidal orientifold or orbifold. We explicitly construct the

### Ambiguity in running spectral index with an extra light field during inflation

• Physics
• 2015
At the beginning of inflation there could be extra dynamical scalar fields that will soon disappear (become static) before the end of inflation. In the light of multi-field inflation, those extra

### Multi-natural inflation in supergravity

• Physics
• 2014
A bstractWe show that the recently proposed multi-natural inflation can be realized within the framework of 4D $\mathcal{N}$ = 1 supergravity. The inflaton potential mainly consists of two

### Quartic potential inspired warm standard and tachyon scalar fields brane-world inflation

• Computer Science
• 2017
It is observed that the ranges of the results of tensor-to-scalar ratio, scalar spectral index and running of spectral favor observational data like BICEP2, WMAP9 and Planck.

### Symmetry Breaking Indication for Supergravity Inflation in Light of the Planck 2015

• Physics
• 2015
Supergravity (SUGRA) theories with exact global U(1) symmetry or shift symmetry in Kähler potential provide natural frameworks for inflation. However, quadratic inflation is disfavoured by the new

## References

SHOWING 1-10 OF 67 REFERENCES

### Running of the scalar spectral index from inflationary models

• Mathematics
• 2003
The scalar spectral index n is an important parameter describing the nature of primordial density perturbations. Recent data, including those from the Wilkinson Microwave Anisotropy Probe satellite,

### Running Spectral Index from Inflation with Modulations

• Physics, Environmental Science
• 2011
We argue that a large negative running spectral index, if confirmed, might suggest that there are abundant structures in the inflaton potential, which result in a fairly large (both positive and

### The spectral index and its running in axionic curvaton

We show that a sizable running spectral index suggested by the recent SPT data can be explained in the axionic curvaton model with a potential that consists of two sinusoidal contributions of

### Multi-natural inflation in supergravity

• Physics
• 2014
A bstractWe show that the recently proposed multi-natural inflation can be realized within the framework of 4D $\mathcal{N}$ = 1 supergravity. The inflaton potential mainly consists of two

### New Universal Local Feature in the Inflationary Perturbation Spectrum

• Physics
• 2008
A model is developed in which the inflaton potential experiences a sudden small change in its second derivative (the effective mass of the inflaton). An exact treatment demonstrates that the

### Is a step in the primordial spectral index favoured by CMB data

• Physics
• 2009
A sudden small change in the second derivative of the inflaton potential can result in a universal local feature in the spectrum of primordial perturbations generated during inflation. The exact

### Running kinetic inflation

• Physics
• 2010
We study a recently proposed running kinetic inflation model in which the inflaton potential becomes flat due to rapid growth of the kinetic term at large inflaton field values. As concrete examples,

### Polynomial chaotic inflation in supergravity

• Physics
• 2013
We present a general polynomial chaotic inflation model in supergravity, for which the predicted spectral index and tensor-to-scalar ratio can lie within the 1σ region allowed by the Planck results.