Infrared divergence of pure Einstein gravity contributions to cosmological density power spectrum

Details Infrared divergence of pure Einstein gravity contributions to cosmological density power spectrum Infrared divergence of pure Einstein gravity contributions to cosmological density power spectrum

2009-02-25

arxiv.org/abs/0902.4285v3

Phys.Rev.Lett.103:021301,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Changed contents, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.021301

We probe the pure Einstein's gravity contributions to the second-order density power spectrum. In the small-scale, we discover that the Einstein's gravity contribution is negligibly small. This guarantees that Newton's gravity is sufficient to handle the baryon acoustic oscillation scale. In the large scale, however, we discover that the Einstein's gravity contribution to the second-order power spectrum dominates the linear-order power spectrum. Thus, pure Einstein gravity contribution appearing in the third-order perturbation leads to an infrared divergence in the power spectrum.

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