D R Matravers and J Triginer 2001 Class. Quantum Grav. 18 3917 doi:10.1088/0264-9381/18/18/310
D R Matravers1 and J Triginer2
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We provide a covariant and gauge-invariant approach to the question of how a first-order pressure can be incorporated self-consistently in a cosmological scenario. The approximation is relevant, in the linear regime, to weakly self-interacting or warm dark matter models. We also derive number density fluctuations in which new modes appear because the number density fluctuations are no longer simply proportional to the density fluctuations.
04.25.-g Approximation methods; equations of motion
95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological)
Issue 18 (21 September 2001)
Received 25 June 2001
Published 5 September 2001
D R Matravers and J Triginer 2001 Class. Quantum Grav. 18 3917
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