Angular Correlation of the CMB in the R_h=ct Universe

TL;DR

This paper investigates the angular correlation features of the CMB in the R_h=ct universe, proposing it can explain the lack of large-angle correlations without inflation, contrasting with standard cosmology.

Contribution

It demonstrates that the R_h=ct universe naturally accounts for the absence of large-angle CMB correlations without requiring inflation.

Findings

R_h=ct universe predicts no large-angle CMB correlation

It offers an alternative explanation to inflation for CMB uniformity

The model aligns with observed CMB features without cosmic variance

Abstract

The emergence of several unexpected large-scale features in the cosmic microwave background (CMB) has pointed to possible new physics driving the origin of density fluctuations in the early Universe and their evolution into the large-scale structure we see today. In this paper, we focus our attention on the possible absence of angular correlation in the CMB anisotropies at angles larger than ~60 degrees, and consider whether this feature may be the signature of fluctuations expected in the R_h=ct Universe. We calculate the CMB angular correlation function for a fluctuation spectrum expected from growth in a Universe whose dynamics is constrained by the equation-of-state p=-rho/3, where p and rho are the total pressure and density, respectively. We find that, though the disparity between the predictions of LCDM and the WMAP sky may be due to cosmic variance, it may also be due to an absence of inflation. The classic horizon problem does not exist in the R_h=ct Universe, so a period of exponential growth was not necessary in this cosmology in order to account for the general uniformity of the CMB (save for the aforementioned tiny fluctuations of 1 part in 100,000 in the WMAP relic signal. We show that the R_h=ct Universe without inflation can account for the apparent absence in CMB angular correlation at angles > 60 degrees without invoking cosmic variance, providing additional motivation for pursuing this cosmology as a viable description of nature.