Inflation in string-inspired cosmology and suppression of CMB low multipoles

@article{Piao2003InflationIS,
  title={Inflation in string-inspired cosmology and suppression of CMB low multipoles},
  author={Yunsong Piao and Shinji Tsujikawa and Xinmin Zhang},
  journal={Classical and Quantum Gravity},
  year={2003},
  volume={21},
  pages={4455-4461}
}
We construct a string-inspired nonsingular cosmological scenario in which an inflaton field is driven up the potential before the graceful exit by employing a low-energy string effective action with an orbifold compactification. This sets up an initial condition for the inflaton to lead to a sufficient number of e-foldings and to generate a nearly scale-invariant primordial density perturbation during slow-roll inflation. Our scenario provides an interesting possibility to explain a suppressed… 
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References

SHOWING 1-10 OF 38 REFERENCES
Seeds of large-scale anisotropy in string cosmology
Pre-big-bang cosmology predicts tiny first-order dilaton and metric perturbations at very large scales. Here we discuss the possibility that other, more copiously generated, perturbations may act, at
Pre-big-bang in string cosmology
The duality-type symmetries of string cosmology naturally lead us to expect a pre-big-bang phase of accelerated evolution as the dual counterpart of the decelerating expansion era of standard
A model of graceful exit in string cosmology
We construct, for the first time, a model of graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era. Exploiting a demonstration that
Stabilizing the dilaton in superstring cosmology
We address the important issue of stabilizing the dilaton in the context of superstring cosmology. Scalar potentials which arise out of gaugino condensates in string models are generally exponential
Adiabatic CMB perturbations in pre - big bang string cosmology
Abstract We consider the pre-Big-Bang scenario with a massive axion field which starts to dominate energy density when oscillating in an instanton-induced potential and subsequently reheats the
Metric perturbations in dilaton-driven inflation.
TLDR
The spectrum of scalar and tensor metric perturbations generated during an epoch of dilaton-driven inflation of the type occurring naturally in string cosmology exhibits nearly Planckian spectra, whose common “temperature” is related to some very basic parameters of the string-cosmology background.
Non-commutative inflation and the CMB
Abstract Non-commutative inflation is a modification of standard general relativity inflation which takes into account some effects of the space–time uncertainty principle motivated by ideas from
Constraints on pre-big bang parameter space from CMBR anisotropies
The so-called curvaton mechanism -a way to convert isocurvature perturba- tions into adiabatic ones- is investigated both analytically and numerically in a pre-big bang scenario where the role of the
Suppressing the lower multipoles in the CMB anisotropies
The Cosmic Microwave Background (CMB) anisotropy power on the largest angular scales observed both by WMAP and COBE DMR appears to be lower than the one predicted by the standard model of cosmology
Graceful Exit in String Cosmology
The graceful exit transition from a dilaton-driven inflationary phase to a decelerated Friedmann-Robertson-Walker era requires certain classical and quantum corrections to the string effective
...
1
2
3
4
...