Isolating the decay rate of cosmological gravitational potential


The decay rate of cosmological gravitational potential measures the deviation from Einstein-de Sitter universe and can put strong constraints on the nature of dark energy and gravity. Usual method to measure this decay rate is through the integrated Sachs-Wolfe (ISW) effect-large scale structure (LSS) cross correlation. However, the interpretation of the measured correlation signal is complicated by the galaxy bias and matter power spectrum. This could bias and/or degrade its constraints to the nature of dark energy and gravity. But, combining the lensing-LSS cross correlation measurements, the decay rate of gravitational potential can be isolated. For any given narrow redshift bin of LSS, the ratio of the two cross correlations directly measures [dlnDϕ/dlna]H(z)/W(χ,χs)[d\ln D_{\phi}/d\ln a]H(z)/W(\chi,\chi_s), where DϕD_{\phi} is the linear growth factor of the gravitational potential, HH is the Hubble constant at redshift zz, W(χ,χs)W(\chi,\chi_s) is the lensing kernel and χ\chi and χs\chi_s are the comoving angular diameter distance to lens and source, respectively. This method is optimal in the sense that (1) the measured quantity is essentially free of systematic errors and is only limited by cosmic variance and (2) the measured quantity only depends on several cosmological parameters and can be predicted from first principles unambiguously. Though fundamentally limited by inevitably large cosmic variance associated with the ISW measurements, it can still put useful independent constraints on the amount of dark energy and its equation of state. It can also provide a powerful test of modified gravity and can distinguish the Dvali-Gabadadze-Porrati model from Λ\LambdaCDM at >2.5σ>2.5\sigma confidence level.Comment: 5 pages, 3 figures. Accepted to ApJ. Added more discussions and presented more detailed explanation of a key formula used in the pape

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