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Abstract: The self-accelerating braneworld model DGP seems to provide a simplealternative to the the standard $\Lambda$CDM cosmology to explain the currentcosmic acceleration, which is strongly indicated by measurements of Type Iasupernovae, as well as other concordant observations. In this work, weinvestigate observational constraints on this scenario from gravitationallensing statistics using the Cosmic Lens All-Sky Survey CLASS lensing sample.We show that a large parameter space of the DGP model is in good agreement withthis radio source gravitational lensing sample. In the flat case,$\Omega \mathrm{K}=0$, the likelihood is maximized, ${\cal L}={\calL \mathrm{max}}$, for $\1 = 0.30 {-0.11}^{+0.19}$. If we relax the prior on$\Omega \mathrm{K}$, the likelihood peaks at $\{\1,\2 \} \simeq \{0.29,0.12\}$, just slightly in the region of open models. However the confidencecontours are pretty elongated so that we can not discard either close or flator open models

Author: Zong-Hong Zhu, Mauro Sereno

Source: https://arxiv.org/

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