Quantum origin of the primordial fluctuation spectrum and its statistics

Landau, Susana J.; León, Gabriel; Sudarsky, Daniel

doi:10.1103/physrevd.88.023526

Cited by 41 publications

(63 citation statements)

References 98 publications

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“…That is, the main evolution equations are given in Eqs. (34) and (35); consequently, in order for those equations to be dimensionally consistent, the fundamental dimensions of λ k change depending on the fundamental units associated to the collapse operatorΘ…”

Section: Discussion On the Csl Inspired Power Spectramentioning

confidence: 99%

Quasi-matter bounce and inflation in the light of the CSL model

2016

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The continuous spontaneous localization (CSL) model has been proposed as a possible solution to the quantum measurement problem by modifying the Schrödinger equation. In this work, we apply the CSL model to two cosmological models of the early Universe: the matter bounce scenario and slow roll inflation. In particular, we focus on the generation of the classical primordial inhomogeneities and anisotropies that arise from the dynamical evolution, provided by the CSL mechanism, of the quantum state associated to the quantum fields. In each case, we obtained a prediction for the shape and the parameters characterizing the primordial spectra (scalar and tensor), i.e. the amplitude, the spectral index and the tensor-to-scalar ratio. We found that there exist CSL parameter values, allowed by other noncosmological experiments, for which our predictions for the angular power spectrum of the CMB temperature anisotropy are consistent with the best fit canonical model to the latest data released by the Planck Collaboration.

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Section: Discussion On the Csl Inspired Power Spectramentioning

confidence: 99%

Quasi-matter bounce and inflation in the light of the CSL model

2016

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“…However, the usual account for the origin of cosmic structure is not fully satisfactory as it lacks a physical mechanism capable of generating the inhomogeneity and anisotropy of our Universe, from an exactly homogeneous and isotropic initial state associated with the early inflationary regime. This issue has been analyzed in previous papers [3][4][5] and one key aspect of the problem is that there is no satisfactory solution within the standard physical paradigms of quantum unitary evolution because this kind of dynamics is not capable to break the initial symmetries of the system. To handle this shortcoming, a proposal has been developed by D. Sudarsky and collaborators [3,[5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence of this modification of the inflationary scenario, the predicted primordial power spectrum is modified and also the CMB fluctuation spectrum. Previous works [3][4][5]10] have extensively discussed both the conceptual and formal aspects of this new proposal, and we refer the reader to the references. However, we would like to comment on an important point, namely the characteristics of the state into which such jump occurs.…”

Section: Introductionmentioning

confidence: 99%

Quantum collapse as a source of the seeds of cosmic structure during the radiation era

2014

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The emergence of the seeds of cosmic structure, from a perfect isotropic and homogeneous Universe, has not been clearly explained by the standard version of inflationary models as the dynamics involved preserve the homogeneity and isotropy at all times. A proposal that attempts to deal with this problem, by introducing "the self-induced collapse hypothesis," has been introduced by D. Sudarsky and collaborators in previous papers. In all these works, the collapse of the wave function of the inflaton mode is restricted to occur during the inflationary period. In this paper, we analyze the possibility that the collapse happens during the radiation era. A viable model can be constructed under the condition that the inflaton field variable must be affected by the collapse while the momentum variable can or cannot be affected. Another condition to be fulfilled is that the time of collapse must be independent of k. However, when comparing with recent observational data, the predictions of the model cannot be distinguished from the ones provided by the standard inflationary scenario. The main reason for this arises from the requirement that primordial power spectrum obtained for the radiation era matches the amplitude of scalar fluctuations consistent with the latest CMB observations. This latter constraint results in a limit on the possible times of collapse and ensures that the contribution of the inflaton field to the energy-momentum tensor is negligible compared to the contribution of the radiation fields.

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“…It results in electronic structure calculations followed by nuclear dynamical studies. The nonadiabatic nuclear dynamics can be treated by accurate quantum methods or by means of analytical nonadiabatic models, e.g., the Landau-Zener [1,2], the Demkov [3] and the Nikitin [4] models.…”

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confidence: 99%