# Gravitational wave constraints on multi-brane inflation

@article{Huston2008GravitationalWC, title={Gravitational wave constraints on multi-brane inflation}, author={Ian Huston and James E. Lidsey and Steven A. Thomas and John Ward}, journal={Journal of Cosmology and Astroparticle Physics}, year={2008}, volume={2008}, pages={016} }

A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound speed of the fluctuations in the inflaton field. Included in this class of models is the effective action for multiple coincident branes in the finite n limit. The action for this configuration is determined using a powerful iterative technique, based upon the fundamental representation of SU(2). In principle the upper…

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## References

SHOWING 1-10 OF 89 REFERENCES

### A Microscopic Limit on Gravitational Waves from D-brane Inflation

- Economics
- 2007

We derive a microscopic bound on the maximal field variation of the inflaton during warped D-brane inflation. By a result of Lyth, this implies an upper limit on the amount of gravitational waves…

### Primordial Non-Gaussianity and Gravitational Waves: Observational Tests of Brane Inflation in String Theory

- Physics
- 2007

We study brane inflation scenarios in a warped throat geometry and show that there exists a consistency condition between the non-Gaussianity of the curvature perturbation and the amplitude and…

### Gravitational wave constraints on Dirac–Born–Infeld inflation

- Physics
- 2007

An upper bound on the amplitude of the primordial gravitational wave spectrum generated during ultra-violet Dirac–Born–Infeld (DBI) inflation is derived. The bound is insensitive to the form of the…

### Phenomenology of D-brane inflation with general speed of sound

- Physics
- 2007

A characteristic of D-brane inflation is that fluctuations in the inflaton field can propagate at a speed significantly less than the speed of light. This yields observable effects that are distinct…

### The Inflationary Brane-Antibrane Universe

- Physics
- 2001

We show how the motion through the extra dimensions of a gas of branes and antibranes can, under certain circumstances, produce an era of inflation as seen by observers trapped on a 3-brane, with the…

### Brane cosmological solutions in six-dimensional warped flux compactifications

- Physics
- 2007

We study cosmology on a conical brane in the six-dimensional Einstein–Maxwell-dilaton system, where the extra dimensions are compactified by a magnetic flux. We systematically construct exact…

### Inflation from wrapped branes

- Physics
- 2007

We show that the use of higher dimensional wrapped branes can significantly extend the inflaton field range compared to brane inflation models which use $D3$-branes. We construct a simple…

### An observational test of holographic inflation

- Physics
- 2006

Observational consequences of inflationary cosmology in the holographic dual of the Randall-Sundrum type II braneworld scenario, as motivated by the AdS/CFT correspondence, are investigated. High…