Influence of finite-temperature effects on CMB power spectrum

We explore the implications of finite-temperature quantum field theory effects on cosmological parameters within the framework of the $Ł$CDM model and its modification. By incorporating temperature-dependent corrections to the cosmological constant, we extend the standard cosmological model to include additional density parameters, ΩŁ₂ and ΩŁ₃, which arise from finite-T quantum gravitational effects. Using the Cosmic Linear Anisotropy Solving System (CLASS), we analyze the impact of these corrections on the cosmic microwave background power spectrum and compare the results with the Planck 2018 data. Through brute-force parameter scans and advanced machine learning techniques, including quartic regression, we demonstrate that the inclusion of ΩŁ₂ and ΩŁ₃ improves the model's predictive accuracy, achieving high R² values and low mean squared error. The present work paves the way for future research into higher-order corrections and enhanced computational methods for cosmological parameter estimation.