Holographic View of Cosmological Perturbations

TL;DR

This paper explores cosmological perturbations using holographic principles, revealing how AdS/CFT correspondence and radion anisotropy influence cosmic microwave background fluctuations.

Contribution

It introduces a holographic perspective to cosmological perturbations, connecting brane models with effective gravity and CMB anisotropies.

Findings

AdS/CFT correspondence is crucial in single brane models.

Effective equations in two-brane models resemble quasi-scalar-tensor gravity.

Radion anisotropy impacts CMB fluctuations via Sachs-Wolfe effect.

Abstract

The cosmological perturbation theory is revisited from the holographic point of view. In the case of the single brane model, it turns out that the AdS/CFT correspondence plays an important role. In the case of the two-brane model, it is shown that the effective equations of motion becomes the quasi-scalar-tensor gravity. It is also demonstrated that the radion anisotropy gives the CMB fluctuations through the Sachs-Wolfe effect.