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…
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…
The giant inflaton
- Physics
- 2004
We investigate a new mechanism for realizing slow roll inflation in string theory, based on the dynamics of p anti-D3 branes in a class of mildly warped flux compactifications. Attracted to the…
Brane/Flux Annihilation and the String Dual of a Non-Supersymmetric Field Theory
- Physics
- 2002
We consider the dynamics of p anti-D3 branes inside the Klebanov-Strassler geometry, the deformed conifold with M units of RR 3-form flux around the S3. We find that for p << M the system relaxes to…