TITLE:
Large-Scale Structure Formation via Quantum Fluctuations and Gravitational Instability
AUTHORS:
Fernando Porcelli, Giancarlo Scibona
KEYWORDS:
Large-Scale Structure, Cosmic Inflation, CMB, Non-Gaussianity
JOURNAL NAME:
International Journal of Geosciences,
Vol.5 No.6,
May
23,
2014
ABSTRACT: This is a
review of the status of the universe as described by the standard cosmological model
combined with the inflationary paradigm. Their key features and predictions, consistent
with the WMAP (Wilkinson Microwave Anisotropies Probe) and Planck Probe 2013 results,
provide a significant mechanism to generate the primordial gravitational waves and
the density perturbations which grow over time, and later become the large-scale
structure of the universe—from the quantum fluctuations in the early era to the
structure observed 13.7 billion later, our epoch. In the single field slow-roll
paradigm, the primordial quantum fluctuations in the inflaton field itself translate
into the curvature and density perturbations which grow over time via gravitational
instability. High density regions continuously attract more matter from the surrounding
space, the high density regions become more and more dense in time while depleting
the low density regions. At late times the highest density regions peaks collapse
into the large structure of the universe, whose gravitational instability effects
are observed in the clustering features of galaxies in the sky. Thus, the origin
of all structure in the universe probably comes from an early era where the universe
was filled with a scalar field and nothing else.