2017/10/02 by Brajesh Gupt, Gupt, Brajesh
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th)
paper · pdf · doi:10.48550/arxiv.1710.00759
openalex publication_date 2017/10/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present proof of principle for a two way interplay between physics at very\nearly Universe and late time observations. We find a relation between\nprimordial mechanisms responsible for large scale power suppression in the\nprimordial power spectrum and the value of reionization optical depth \τ.\nSuch mechanisms can affect the estimation of \τ. We show that using future\nmeasurements of \τ, one can obtain constraints on the pre-inflationary\ndynamics, providing a new window on the physics of the very early Universe.\nFurthermore, the new, re-estimated \τ can potentially resolve moderate\ndiscrepancy between high and low-\ℓ measurements of \τ, hence providing\nempirical support for the power suppression anomaly and its primordial origin.\n