Galaxy clustering constraints on deviations from Newtonian gravity at cosmological scales II: Perturbative and numerical analyses of power spectrum and bispectrum

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dc.creatorShirata, Akihito
dc.creatorSuto, Yasushi
dc.creatorHikage, Chiaki
dc.creatorShiromizu, Tetsuya
dc.creatorYoshida, Naoki
dc.date2007-05-09
dc.date.accessioned2026-07-07T12:13:30Z
dc.date.available2026-07-07T12:13:30Z
dc.descriptionWe explore observational constraints on possible deviations from Newtonian gravity by means of large-scale clustering of galaxies. We measure the power spectrum and the bispectrum of Sloan Digital Sky Survey galaxies and compare the result with predictions in an empirical model of modified gravity. Our model assumes an additional Yukawa-like term with two parameters that characterize the amplitude and the length scale of the modified gravity. The model predictions are calculated using two methods; the second-order perturbation theory and direct N-body simulations. These methods allow us to study non-linear evolution of large-scale structure. Using the simulation results, we find that perturbation theory provides reliable estimates for the power spectrum and the bispectrum in the modified Newtonian model. We also construct mock galaxy catalogues from the simulations, and derive constraints on the amplitude and the length scale of deviations from Newtonian gravity. The resulting constraints from power spectrum are consistent with those obtained in our earlier work, indicating the validity of the previous empirical modeling of gravitational nonlinearity in the modified Newtonian model. If linear biasing is adopted, the bispectrum of the SDSS galaxies yields constraints very similar to those from the power spectrum. If we allow for the nonlinear biasing instead, we find that the ratio of the quadratic to linear biasing coefficients, b_2/b_1, should satisfy -0.4 < b_2/b_1<0.3 in the modified Newtonian model.
dc.description12 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0705.1311
dc.identifierhttp://arxiv.org/abs/0705.1311
dc.identifierPhys.Rev.D76:044026,2007
dc.identifierdoi:10.1103/PhysRevD.76.044026
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/210866
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleGalaxy clustering constraints on deviations from Newtonian gravity at cosmological scales II: Perturbative and numerical analyses of power spectrum and bispectrum
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