Cosmic Tango Between the Very Small and the Very Large: Addressing CMB Anomalies Through Loop Quantum Cosmology

Frontiers in Astronomy and Space Sciences

V. Sreenath¹  Abhay Ashtekar²  Brajesh Gupt³ 

[1] Department of Physics, National Institute of Technology Karnataka, Surathkal, India;Institute for Gravitation and the Cosmos and Physics Department, The Pennsylvania State University, University Park, Pennsylvania, PA, United States;Texas Advanced Computing Center, The University of Texas at Austin, Austin, TX, United States;

关键词: CMB;    anomalies;    loop quantum cosmology (LQC);    big bounce;    UV-IR interplay;   

DOI  :  10.3389/fspas.2021.685288

来源: DOAJ

【 摘 要 】

While the standard, six-parameter, spatially flat ΛCDM model has been highly successful, certain anomalies in the cosmic microwave background bring out a tension between this model and observations. The statistical significance of any one anomaly is small. However, taken together, the presence of two or more of them imply that according to standard inflationary theories we live in quite an exceptional Universe. We revisit the analysis of the PLANCK collaboration using loop quantum cosmology, where an unforeseen interplay between the ultraviolet and the infrared makes the primordial power spectrum scale dependent at very small k. Consequently, we are led to a somewhat different ΛCDM Universe in which anomalies associated with large scale power suppression and the lensing amplitude are both alleviated. The analysis also leads to new predictions for future observations. This article is addressed both to cosmology and loop quantum gravity communities, and we have attempted to make it self-contained.

【 授权许可】

Unknown