PIRSA:13010114

Video URL

https://pirsa.org/13010114

Cosmic Tides

Pen, U. (2013). Cosmic Tides. Perimeter Institute for Theoretical Physics. https://pirsa.org/13010114

Pen, Ue-Li. Cosmic Tides. Perimeter Institute for Theoretical Physics, Jan. 29, 2013, https://pirsa.org/13010114 

          @misc{ scivideos_PIRSA:13010114,
            doi = {10.48660/13010114},
            url = {https://pirsa.org/13010114},
            author = {Pen, Ue-Li},
            keywords = {Cosmology},
            language = {en},
            title = {Cosmic Tides},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2013},
            month = {jan},
            note = {PIRSA:13010114 see, \url{https://scivideos.org/pirsa/13010114}}
          }

Ue-Li Pen Canadian Institute for Theoretical Astrophysics (CITA)

Talk numberPIRSA:13010114
DOI10.48660/13010114
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

We apply CMB lensing techniques to large scale structure and solve for the 3-D cosmic tidal field. We use small scale filamentary structures to solve for the large scale tidal shear and gravitational potential. By comparing this to the redshift space density field, one can measure the gravitational growth factor on large scales without cosmic variance. This potentially enables accurate measurements of neutrino masses and reconstruction of radial modes lost in 21 cm intensity mapping, which are essential for CMB and other cross correlations. We relate the tidal fields to the squeezed limit bispectrum, and present initial results from simulations and data from the SDSS.