N-body simulations of DGP and degravitation theories
N-body simulations of DGP and degravitation theories
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DOI：
10.1103/physrevd.80.064023
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发表时间：
2009-03
影响因子：
5
通讯作者：
J. Khoury;Mark Wyman
中科院分区：
文献类型：
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作者：
J. Khoury;Mark Wyman
我们对具有无限体积额外维度的理论进行了N体模拟，例如Dvali-Gabadadze-Porrati模型及其高维推广，其中4D引力是由质量引力子介导的。这些引力子的纵模调节了一个额外的标量力，我们将其建模为泊松方程的密度相关修正。这增强了引力聚集，特别是在经历了轻微非线性处理的尺度上。而Smith等人提出的标准非线性拟合算法。为了在非线性尺度上高估这种功率增强，我们给出了一个修正的拟合公式，它与我们的功率谱非常好地拟合。由于星系偏差的不确定性，我们的结果与星系红移测量的精确功率谱测定是一致的，即使对于小到300Mpc的引力子康普顿波长也是如此。我们的模型足够普遍，我们希望它能捕捉到一大类相关的高维引力场景的现象学。
We perform N-body simulations of theories with infinite-volume extra dimensions, such as the Dvali-Gabadadze-Porrati model and its higher-dimensional generalizations, where 4D gravity is mediated by massive gravitons. The longitudinal mode of these gravitons mediates an extra scalar force, which we model as a density-dependent modification to the Poisson equation. This enhances gravitational clustering, particularly on scales that have undergone mild nonlinear processing. While the standard nonlinear fitting algorithm of Smith et al. overestimates this power enhancement on nonlinear scales, we present a modified fitting formula that offers a remarkably good fit to our power spectra. Because of the uncertainty in galaxy bias, our results are consistent with precision power spectrum determinations from galaxy redshift surveys, even for graviton Compton wavelengths as small as 300 Mpc. Our model is sufficiently general that we expect it to capture the phenomenology of a wide class of related higher-dimensional gravity scenarios.