PIRSA:14080019

Video URL

https://pirsa.org/14080019

CMB anomalies from primordial gravitational waves

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

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

          @misc{ scivideos_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 for Theoretical Physics},
            year = {2014},
            month = {aug},
            note = {PIRSA:14080019 see, \url{https://scivideos.org/index.php/pirsa/14080019}}
          }

Yi Wang Hong Kong University of Science and Technology

Talk numberPIRSA:14080019
DOI10.48660/14080019
Source RepositoryPIRSA
Talk Type Scientific Series
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.