the dark matter phase-space density indicator Q=ρ/(σ1D2)3/2ݑ„ݜŒsuperscriptsuperscriptsubscriptݜŽ1ݐ·232Q=\rho/(\sigma_1D^2)^3/2italic_Q = italic_ρ / ( italic_σ start_POSTSUBSCRIPT 1 italic_D end_POSTSUBSCRIPT start_POSTSUPERSCRIPT 2 end_POSTSUPERSCRIPT ) start_POSTSUPERSCRIPT 3 / 2 end_POSTSUPERSCRIPT remains constant during the expansion of the universe

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