Temperature effect on the power spectrum in inflation

TL;DR

This paper investigates how thermal effects influence the inflationary power spectrum, demonstrating that temperature-dependent factors can explain observed CMB anisotropies at large scales, especially low multipoles.

Contribution

It introduces a thermal field dynamics approach to analyze the impact of thermal vacuum on inflationary power spectrum and matches observational data at large scales.

Findings

Thermal effects modify the inflationary power spectrum at large scales.

Thermal vacuum can account for low multipole CMB observations.

Holographic cutoff removes divergences in the thermal analysis.

Abstract

We examine the effect of the thermal vacuum on the power spectrum of inflation by using the thermal field dynamics. We find that the thermal effect influences the CMB anisotropy at large length scale. After removing the divergence by using the holographic cutoff, we observe that the thermal vacuum explains well the observational CMB result at low multipoles. This shows that the temperature dependent factor should be considered in the study of power spectrum in inflation, especially at large length scale.