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

Understand

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.