PIRSA:11020163

Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky

Hajian, A. (2011). Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky. Perimeter Institute. https://pirsa.org/11020163

Hajian, Amir. Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky. Perimeter Institute, Feb. 24, 2011, https://pirsa.org/11020163 

          @misc{ pirsa_PIRSA:11020163,
            doi = {10.48660/11020163},
            url = {https://pirsa.org/11020163},
            author = {Hajian, Amir},
            keywords = {Cosmology},
            language = {en},
            title = {Are There Echoes From The Pre-Big Bang Universe? A Search for Low Variance Circles in the CMB Sky},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020163 see, \url{https://pirsa.org}}
          }

Amir Hajian

Arteria AI

Talk number
PIRSA:11020163
Collection
Talk Type
Subject
Abstract
The existence of concentric low variance circles in the CMB sky, generated by black-hole encounters in an aeon preceding our big bang, is a prediction of the Conformal Cyclic Cosmology. Detection of three families of such circles in WMAP data was recently reported by Gurzadyan & Penrose (2010). We reassess the statistical significance of those circles by comparing with Monte Carlo simulations of the CMB sky with realistic modeling of the anisotropic noise in WMAP data. We find that the circles are not anomalous and that all three groups are consistent at 3sigma level with a Gaussian CMB sky as predicted by inflationary cosmology model.