Statistics – Computation
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350..469h&link_type=abstract
Nature (ISSN 0028-0836), vol. 350, April 11, 1991, p. 469-473. Research supported by NASA and Alfred P. Sloan Foundation.
Statistics
Computation
7
Cosmology, Doppler Effect, Evolution (Development), Gravitational Collapse, Interstellar Gas, Astronomical Spectroscopy, Atomic Recombination, Background Radiation, Computational Astrophysics
Scientific paper
A new mechanism is described which can create an instability in homogeneous gaseous matter at very low density. When an isotropic background radiation field has, near an electronic resonance, a spectral feature for which photon occupation number increases with frequency, moving atoms increase their speed by taking energy from the photon distribution. In a cosmological setting, a sufficiently intense spectral feature can interact with neutral atomic gas, after recombination, to generate protogalactic perturbations of the scale and magnitude needed to explain large-scale cosmic structure.
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