PIRSA:17100081

Primordial gravity waves from tidal imprints in large-scale structure

Masui, K. (2017). Primordial gravity waves from tidal imprints in large-scale structure. Perimeter Institute. https://pirsa.org/17100081

Masui, Kiyoshi. Primordial gravity waves from tidal imprints in large-scale structure. Perimeter Institute, Oct. 17, 2017, https://pirsa.org/17100081 

          @misc{ pirsa_PIRSA:17100081,
            doi = {10.48660/17100081},
            url = {https://pirsa.org/17100081},
            author = {Masui, Kiyoshi},
            keywords = {Cosmology},
            language = {en},
            title = {Primordial gravity waves from tidal imprints in large-scale structure},
            publisher = {Perimeter Institute},
            year = {2017},
            month = {oct},
            note = {PIRSA:17100081 see, \url{https://pirsa.org}}
          }

Kiyoshi Masui Massachusetts Institute of Technology (MIT)

DOI 10.48660/17100081
Collection
Talk Type Scientific Series
Subject

Abstract

I will describe a tidal effect whereby the decay of primordial gravity waves leaves a permanent shear in the large-scale structure of the Universe. Future large-scale structure surveys - especially radio surveys of high-redshift hydrogen gas - could measure this shear and its spatial dependence to form a map of the initial gravity-wave field. The three dimensional nature of this probe makes it sensitive to the helicity of the gravity waves, allowing for searches for early-Universe gravitational parity violation. Due to the large number of measurable modes in the high-redshift large-scale structure, these tidal imprints could ultimately be more sensitive than searches for CMB B-modes.