• Corpus ID: 227739127

The Quantum Origin of Quasi de Sitter: a Model Independent Quantum Cosmological Tilt

@article{Gmez2020TheQO,
  title={The Quantum Origin of Quasi de Sitter: a Model Independent Quantum Cosmological Tilt},
  author={C{\'e}sar G{\'o}mez and Raul Jimenez},
  journal={arXiv: High Energy Physics - Theory},
  year={2020}
}
The most robust prediction of inflationary cosmology is the existence of a red tilt for the spectrum of curvature fluctuations that is experimentally of order $0.04$. The tilt is derived solving the exact equation for quantum fluctuations in a quasi de Sitter background defined by a equation of state $\epsilon \equiv \frac{(p+\rho)}{\rho}$ with $\epsilon$ small but non vanishing. The experimental data selects among the different quasi de Sitter inflaton potentials. The origin of the lack of… 

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References

SHOWING 1-10 OF 29 REFERENCES

Quantum Vacuum Instability of 'Eternal' de Sitter Space

elds in global de Sitter space is shown to be unstable to small perturbations, even for a massive free eld with no self-interactions. There are perturbations of this state with arbitrarily small

Cosmology from quantum information

We describe inflation in terms of a time dependent quantum density matrix with time playing the role of a stochastic variable. Using a quasi-de Sitter model we compute the corresponding quantum

QUANTUM-TO-CLASSICAL TRANSITION FOR FLUCTUATIONS IN THE EARLY UNIVERSE

According to the inflationary scenario for the very early Universe, all inhomogeneities in the Universe are of genuine quantum origin. On the other hand, looking at these inhomogeneities and

Conformal vacua and entropy in de Sitter space

The de Sitter/conformal field theory (dS/CFT) correspondence is illuminated through an analysis of massive scalar field theory in d-dimensional de Sitter space. We consider a one-parameter family of

In search of an observational quantum signature of the primordial perturbations in slow-roll and ultraslow-roll inflation

In the standard inflationary paradigm, cosmological density perturbations are generated as quantum fluctuations in the early Universe, but then undergo a quantum-to-classical transition. A key role

Entanglement entropy of cosmological perturbations

We show that the entropy of cosmological perturbations originating as quantum vacuum fluctuations in the very early universe, including the contribution of the leading nonlinear interactions, can be

Instability of global de Sitter space to particle creation

We show that global de Sitter space is unstable to particle creation, even for a massive free field theory with no self-interactions. The $O(4,1)$ de Sitter invariant state is a definite phase

Semiclassicality and decoherence of cosmological perturbations

Transition to the semiclassical behaviour and the decoherence process for inhomogeneous perturbations generated from the vacuum state during an inflationary stage in the early Universe are considered

Decay of the de Sitter vacuum

The decay rate of the Bunch-Davies state of a massive scalar field in the expanding flat spatial sections of de Sitter space is determined by an analysis of the particle pair creation process in real