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This is areview of the status of the universe as described by the standard cosmological modelcombined with the inflationary paradigm. Their key features and predictions, consistentwith the WMAP Wilkinson Microwave Anisotropies Probe and Planck Probe 2013 results,provide a significant mechanism to generate the primordial gravitational waves andthe density perturbations which grow over time, and later become the large-scalestructure of the universe—from the quantum fluctuations in the early era to thestructure observed 13.7 billion later, our epoch. In the single field slow-rollparadigm, the primordial quantum fluctuations in the inflaton field itself translateinto the curvature and density perturbations which grow over time via gravitationalinstability. High density regions continuously attract more matter from the surroundingspace, the high density regions become more and more dense in time while depletingthe low density regions. At late times the highest density regions peaks collapseinto the large structure of the universe, whose gravitational instability effectsare observed in the clustering features of galaxies in the sky. Thus, the originof all structure in the universe probably comes from an early era where the universewas filled with a scalar field and nothing else.

KEYWORDS

Large-Scale Structure, Cosmic Inflation, CMB, Non-Gaussianity

Cite this paper

Porcelli, F. and Scibona, G. 2014 Large-Scale Structure Formation via Quantum Fluctuations and Gravitational Instability. International Journal of Geosciences, 5, 634-656. doi: 10.4236-ijg.2014.56058.





Autor: Fernando Porcelli, Giancarlo Scibona

Fuente: http://www.scirp.org/



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