Phys. Rev. Lett. 103, 021301 (2009) [4 pages]Infrared Divergence of Pure Einstein Gravity Contributions to the Cosmological Density Power SpectrumReceived 16 March 2009; published 10 July 2009 We probe the pure Einstein gravity contributions to the second-order density power spectrum. On the small scale, we discover that Einstein’s gravity contribution is negligibly small. This guarantees that Newton’s gravity is currently sufficient to handle the baryon acoustic oscillation scale. On the large scale, however, we discover that Einstein’s gavity contribution to the second-order power spectrum dominates the linear-order power spectrum. Thus, the pure Einstein gravity contribution appearing in the third-order perturbation leads to an infrared divergence in the power spectrum. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.021301
DOI:
10.1103/PhysRevLett.103.021301
PACS:
98.80.Jk, 04.25.Nx, 98.65.Dx
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