New Method for Probing Dark Energy using the Rees-Sciama Effect

TL;DR

This paper proposes a novel approach to probe dark energy by analyzing the scale at which the Rees-Sciama effect causes a flip in the correlation between CMB and large-scale structure, offering insights into dark energy models.

Contribution

It introduces the dependence of the Rees-Sciama effect's flipping scale on dark energy models as a new method for investigating dark energy.

Findings

The flipping scale varies with different dark energy models.

The Rees-Sciama effect can change the sign of CMB-LSS correlation.

Potential for using the flipping scale as a diagnostic tool.

Abstract

The integrated Sachs-Wolfe (ISW) effect provides us the information of the time evolution of gravitational potential. The cross-correlation between the cosmic microwave background (CMB) and the large scale structure (LSS) is known as a promising way to extract the ISW effect. Compared to CMB, the matter fluctuation can grow non-linearly and this is represented in the gravitational potential. Compared to the linear ISW effect, this non-linear ISW effect known as the Rees-Sciama (RS) effect shows the unique behavior by changing the anti-correlated cross correlation between the CMB and the mass tracer into the positively correlated cross correlation. We show that the dependence of this flipping scale on dark energy models and it might be used as a new method to investigate dark energy models.