Chaplygin Gas

Chaplygin gas,

which occurs in certain theories of cosmology, is a hypothetical substance that satisfies an exotic equation of state in the form
$p = -A/\rho^\alpha$,
where $p$ is the pressure, $\rho$ is the density, with $\alpha = 1$ and $A$ a positive constant. The substance is named after Sergey Chaplygin.

In some models, generalized Chaplygin gas is considered, where $\alpha$ is a parameter, which can take on values $0 < \alpha \le 1$.

See also

* Dark fluid

References

Physical cosmology

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