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Dust solution
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<p>In <a href="/facts/General_relativity/jVsoIg8X">general relativity</a>, a dust solution is a <a href="/facts/Fluid_solution/AlI5hQIn">fluid solution</a>, a type of <a href="/facts/Exact_solutions_in_general_relativity/MFb3MFaC">exact solution</a> of the <a href="/facts/Einstein_field_equation/j2rJTzW9">Einstein field equation</a>, in which the gravitational field is produced entirely by the mass, momentum, and stress density of a <a href="/facts/Perfect_fluid/wWpblQcg">perfect fluid</a> that has <i>positive mass density</i> but <i>vanishing pressure</i>. Dust solutions are an important special case of <a href="/facts/Fluid_solution/AlI5hQIn">fluid solutions</a> in general relativity. </p>