Density irregularities in the early universe

Details Density irregularities in the early universe Density irregularities in the early universe

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985iraj...17..110l&link_type=abstract

Irish Astronomical Journal (ISSN 0021-1052), vol. 17, Sept. 1985, p. 110-112.

Astronomy and Astrophysics

Astronomy

Computerized Simulation, Density Distribution, Evolution (Development), Universe, Black Holes (Astronomy), Dark Matter, Gravitational Collapse, Gravitons, Perturbation Theory

Scientific paper

Scenarios and computer simulations are examined in an investigation of density irregularities in the early universe. As a result of recent advances in theory and observation, investigations of the nature of density irregularities are nearing a critical stage. Two definite scenarios for producing energy density irregularities are examined: quantum field fluctuations during inflation and string loops formed during later phase transitions. Neither baryonic nor neutrino dark matter can have produced galaxies by now. The cold dark matter scenario (involving low mass stars or Jupiters, primordial black holes, nuclearites, axions, or gravitons) is susceptible to so many tests that it must surely succeed or fail within a small number of years. If it succeeds, we will know what the universe is made of and how its structure was formed; if it fails, we might consider isothermal as opposed to adiabatic initial conditions.

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