Scale-invariant perturbations from chaotic inflation

@article{Byrnes2006ScaleinvariantPF,
  title={Scale-invariant perturbations from chaotic inflation},
  author={Christian T. Byrnes and David Wands},
  journal={Physical Review D},
  year={2006},
  volume={73},
  pages={063509}
}
Vacuum fluctuations in the inflaton field driving chaotic inflation with a quadratic potential give a red spectrum of primordial density perturbations, n=0.97. However angular fluctuations in an O(N)-symmetric quadratic potential have a very nearly scale-invariant spectrum, n=0.9998. We investigate the possibility that these isocurvature field perturbations could give the dominant contribution to the primordial density perturbation after inflation. 
Local non-Gaussianity from inflation
The non-Gaussian distribution of primordial perturbations has the potential to reveal the physical processes at work in the very early universe. Local models provide a well-defined class of
Multiple field inflation
Inflation offers a simple model for very early evolution of our universe and the origin of primordial perturbations on large scales. Over the last 25 years we have become familiar with the
Inflation From Matrix Valued Scalar Fields
We propose an inflationary scenario, M-flation, in which inflation is driven by three N ×N hermitian matrices Φi, i = 1, 2, 3. The inflation potential of our model, which is strongly motivated from
Constraints on generating the primordial curvature perturbation and non-Gaussianity from instant preheating
TLDR
In the case where the symmetry is strongly broken during inflation the non-Gaussianity parameter fNL is generally large and negative and the constraints are very tight in all of the models proposed and special initial conditions are required for the models to work.
Constraints on generating the primordial curvature perturbation and non-Gaussianity from instant preheating
TLDR
In the case where the symmetry is strongly broken during inflation the non-Gaussianity parameter fNL is generally large and negative and the constraints are very tight in all of the models proposed and special initial conditions are required for the models to work.
Primordial non-Gaussianities of general multiple-field inflation
We perform a general study of the primordial scalar non-Gaussianities in multi-field inflationary models in Einstein gravity. We consider models governed by a Lagrangian which is a general function
Non-Gaussianity beyond slow roll in multi-field inflation
We study the non-Gaussianity generated during multiple-field inflation. We provide an exact expression for the bispectrum parameter fNL which is valid beyond the slow-roll regime, valid for certain
Stability of multifield cosmological solutions
We explore the stability properties of multifield solutions of assisted inflation type, where several fields collectively evolve to the same configuration. In the case of noninteracting fields, we
INFLATON IS FLATON IN SPLIT SUSY
It is shown that, in the context of split supersymmetry, a simple model with a single complex scalar field can produce chaotic inflation and generate the observed amount of baryon asymmetry via the
...
...

References

SHOWING 1-10 OF 46 REFERENCES
Large Scale Quantum Fluctuations in the Inflationary Universe
Quantum fluctuations of an inflation-driving scalar field are evaluated in a way manifestly independent of the choice of coordinate gauge conditions. It is found that the dynamical degree of freedom
Dynamics and perturbations in assisted chaotic inflation
On compactification from higher dimensions, a single free massive scalar field gives rise to a set of effective four-dimensional scalar fields, each with a different mass. These can cooperate to
Non-Gaussian perturbations from multi-field inflation
We show how primordial bispectrum of density perturbations from inflation may be characterized in terms of manifestly gauge-invariant cosmological perturbations at second order. The primordial metric
Non-Gaussian features of primordial fluctuations in single field inflationary models
We compute the three point correlation functions for primordial scalar and tensor fluctuations in single field inflationary models. We obtain explicit expressions in the slow roll limit where the
Correlated adiabatic and isocurvature perturbations from double inflation
It is shown that double inflation (two minimally coupled massive scalar fields) can produce correlated adiabatic and isocurvature primordial perturbations. Depending on the two relevant parameters of
Primordial non-Gaussianities from multiple-field inflation
We calculate the three-point correlation function evaluated at horizon crossing for a set of interacting scalar fields coupled to gravity during inflation. This provides the initial condition for the
Observational test of two-field inflation
We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent consistency
...
...