Generation of primordial perturbations in the early universe
Abstract
The role of adiabatic perturbations in the evolution of the universe is discussed, with note taken of the instability produced in a homogeneous gravitating fluid by small perturbations. A gaugeinvariant theory of potential perturbations is developed for the origin of fluctuations on a scale of galaxies and clusters after the first second. The perturbations are described using a gaugeinvariant linear combination of hydrodynamic and gravitational potentials of disturbances of the matter velocity and the metric. The initial fluctuation phases are assumed to have been random, i.e., quantum or thermal, and equipartitioned in a Higgs field distribution. The correlated phases of the fluctuations would result in a growth mode which would reach a decay mode and produce the largescale metric disturbances.
 Publication:

Very Early Universe
 Pub Date:
 1983
 Bibcode:
 1983veu..conf..311L
 Keywords:

 Big Bang Cosmology;
 Perturbation Theory;
 Universe;
 Acoustic Propagation;
 Astronomical Models;
 Galactic Evolution;
 Gauge Invariance;
 Mass Distribution;
 Quantum Theory;
 Astrophysics