منابع مشابه
Generating Non-Gaussian Adiabatic Fluctuations from Inflation
As the quality of cosmological data continue to improve, it is natural to test the statistics of primordial fluctuations: are they Gaussian or non-Gaussian? I review a model which generates non-Gaussian adiabatic fluctuations from inflation. Current investigations suggest that there may possibly be a non-Gaussian signal in large angle cosmic microwave background anisotropy data. Statistics of m...
متن کاملCorrelated 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 the model, the contributions to the primordial perturbations are computed, with special emphasis on the correlation, which can be quantitatively represented by a correlation spectrum. Finally the p...
متن کاملCan Non-Adiabatic Perturbations Arise After Single-Field Inflation?
It is shown that non-adiabatic cosmological perturbations cannot appear during the period of reheating following inflation with a single scalar inflaton field. Electronic address: [email protected] According to a widely adopted picture [1], the perturbations to the Robertson– Walker cosmology arose from the quantum fluctuations in a slowly rolling scalar “inflaton” field during a peri...
متن کاملBounds on non-adiabatic evolution in single-field inflation
We examine the regime of validity of N-point spectra predictions of single field inflation models that invoke transient periods of non-adiabatic evolution. Such models generate oscillatory features in these spectra spanning frequencies up to the inverse time scale of the transient feature. To avoid strong coupling of fluctuations in these theories this scale must be at least ∼ 10−2/cs of the Hu...
متن کاملMust Cosmological Perturbations Remain Non-Adiabatic After Multi-Field Inflation?
Even if non-adiabatic perturbations are generated in multi-field inflation, the perturbations will become adiabatic if the universe after inflation enters an era of local thermal equilibrium, with no non-zero conserved quantities, and will remain adiabatic as long as the wavelength is outside the horizon, even when local thermal equilibrium no longer applies. Small initial non-adiabatic perturb...
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ژورنال
عنوان ژورنال: Journal of Cosmology and Astroparticle Physics
سال: 2019
ISSN: 1475-7516
DOI: 10.1088/1475-7516/2019/12/018