Chaplygin gas 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 .
- Kamenshchik, Alexander Yu.; Moschellai, Ugo; Pasquier, Vincent (2001), "An alternative to quintessence", Phys. Lett. B 511 (2-4): 265, arXiv:gr-qc/0103004, Bibcode:2001PhLB..511..265K, doi:10.1016/S0370-2693(01)00571-8
- Bento, M. C.; Bertolami, O.; Sen, A. A. (2002), "Generalized Chaplygin gas, accelerated expansion and dark energy-matter unification", Phys. Rev. 66 (4): 043507, arXiv:gr-qc/0202064, Bibcode:2002PhRvD..66d3507B, doi:10.1103/PhysRevD.66.043507
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