Gravitational instability in a coasting universe

Details Gravitational instability in a coasting universe Gravitational instability in a coasting universe

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..373l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 373, 374.

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Cosmology, Gravitational Fields, Universe, Computational Astrophysics, Time Dependence

Scientific paper

The paper describes a theory of gravity consistent with the inverse square law of Newtonian gravity behind a universe expanding with zero acceleration (i.e., 'coasting') and examines its consequences for gravitational instability. It is found that such a universe is highly unstable to the formation of local condensations and voids. An expanding universe consistent with the inverse square law and coasting in neutral equilibrium implies a gravitational field equation with a uniform time-dependent form on the right-hand side proportional to the average mass density of the universe and linear perturbations that grow sufficiently quickly to form galaxy-sized density contrasts from thermal fluctuations at decoupling.

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