Astronomy Quiz
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COSMOLOGY & THE UNIVERSE
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In cosmology, the equation of state parameter, w=P/ρw = P/\rho, describes the relationship between a component's pressure PP and its energy density ρ\rho. A component can drive cosmic acceleration if w<−1/3w < -1/3. For standard dark matter, wDM=0w_{DM} = 0, and for dark energy (cosmological constant), wΛ=−1w_{\Lambda} = -1. If a new cosmic component were discovered with an equation of state w=−1/2w = -1/2, what would be its primary cosmological role?
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