Chaplygin gas
From Infogalactic: the planetary knowledge core
Chaplygin gas[1][2] which occurs in certain theories of cosmology, is a hypothetical substance that satisfies an exotic equation of state in the form where is the pressure, is the density, with and a positive constant. The substance is named after Sergey Chaplygin.
In some models, generalized Chaplygin gas is considered, where is a parameter which can take on values .
See also
References
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