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• W2014893383 abstract "Utilizing the CLASS statistical sample, we investigate the constraint of the splitting angle statistic of strong gravitational lenses (SGL) on the equation-of-state parameter w = p/ρ of the dark energy in the flat cold dark matter (CDM) cosmology. Through the comoving number density of dark halos described by the Press–Schechter theory, dark energy affects the efficiency with which dark-matter concentrations produce strong lensing signals. The constraints on both constant w and time-varying w(z) = w0 + waz/(1 + z) from the SGL splitting angle statistic are consistently obtained by adopting a two-model combined mechanism of a dark halo density profile matched at the mass scale Mc. Our main observations are that (1) the resulting model parameter Mc is found to be Mc ∼ 1.4 for both constant w and time-varying w(z), which is larger than Mc ∼ 1 obtained in literatures; (2) the fitting results for the constant w are found to be w = −0.89+0.49−0.26 and w = −0.94+0.57−0.16 for the source redshift distributions of the Gaussian models g(zs) and gc(zs), respectively, which are consistent with the ΛCDM at 95% C.L.; (3) the time-varying w(z) is found to be σ8 = 0.74: (Mc; w0, wa) = (1.36; − 0.92, − 1.31) and (Mc; w0, wa) = (1.38; − 0.89, − 1.21) for g(zs) and gc(zs), respectively; the influence of σ8 is investigated and found to be sizable for σ8 = 0.74–0.90. After marginalizing the likelihood functions over the cosmological parameters (ΩM, h, σ8) and the model parameter Mc, we find that the data of SGL splitting angle statistic lead to the best-fit results (w0, wa) = (−0.88+0.65−1.03, − 1.55+1.77−1.88) and (w0, wa) = (−0.91+0.60−1.46, − 1.60+1.60−2.57) for g(zs) and gc(zs), respectively." @default.
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• W2014893383 date "2009-03-24" @default.
• W2014893383 modified "2023-10-16" @default.
• W2014893383 title "CONSTRAINING DARK ENERGY FROM THE SPLITTING ANGLE STATISTIC OF STRONG GRAVITATIONAL LENSES" @default.
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• W2014893383 doi "https://doi.org/10.1088/0004-637x/694/2/1402" @default.
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