PIRSA:14080019

CMB anomalies from primordial gravitational waves

Wang, Y. (2014). CMB anomalies from primordial gravitational waves. Perimeter Institute. https://pirsa.org/14080019

Wang, Yi. CMB anomalies from primordial gravitational waves. Perimeter Institute, Aug. 13, 2014, https://pirsa.org/14080019 

          @misc{ pirsa_PIRSA:14080019,
            doi = {10.48660/14080019},
            url = {https://pirsa.org/14080019},
            author = {Wang, Yi},
            keywords = {Cosmology},
            language = {en},
            title = {CMB anomalies from primordial gravitational waves},
            publisher = {Perimeter Institute},
            year = {2014},
            month = {aug},
            note = {PIRSA:14080019 see, \url{https://pirsa.org}}
          }

Yi Wang

Hong Kong University of Science and Technology

Talk number
PIRSA:14080019
Talk Type
Subject
Abstract
We relate CMB anomalies and the recent observational evidence of primordial gravitational
waves. Two aspects are investigated:

(a) Several anomalies are spotted on the low ell temperature map of the WMAP and Planck
experiments. However, those anomalies disappear at high ell. We propose that those low ell
temperature anomalies may come from nearly scale invariant anomalies of the tensor sector.
Those anomalies on the temperature map naturally decay towards small scales, characterized
by the tensor-to-temperature radiation transfer function.

(b) The anomalies introduced by the gravitational waves discovery. Strong tension is noticed
between the BICEP2 and Planck data. We study in detail how blue tilt of the tensor spectrum
reconciles the tension between those datasets.